US Patent No: 8,019,291

Number of patents in Portfolio can not be more than 2000

Method and system for frequency down-conversion and frequency up-conversion

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ALSO PUBLISHED AS: 20090318097
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transmitter. The up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used as a frequency or phase reference, the oscillating signal is not modulated, and controls a switch that is connected to a bias signal. When the invention is being used in the frequency modulation (FM) or phase modulation (PM) implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. In the amplitude modulation implementation (AM), the oscillating signal is not modulated, but rather causes the switch to gate a reference signal that is substantially equal to or proportional to the information signal. In the FM and PM implementations, the signal that is output from the switch is modulated substantially the same as the modulated oscillating signal. In the AM implementation, the signal that is output from the switch has an amplitude that is a function of the information signal. In both embodiments, the output of the switch is filtered, and the desired harmonic is output.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PARKERVISION, INC.JACKSONVILLE, FL165

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bultman, Michael J Jacksonville, FL 142 4734
Cook, Robert W Switzerland, FL 140 4742
Looke, Richard C Jacksonville, FL 136 4742
Moses,, Jr Charley D - 58 531
Sorrells, David F Middleburg, FL 261 6729

Cited Art

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (81)
6,049,706 Integrated frequency translation and selectivity 123 1998
6,061,551 Method and system for down-converting electromagnetic signals 126 1998
6,061,555 Method and system for ensuring reception of a communications signal 110 1998
6,091,940 Method and system for frequency up-conversion 113 1998
6,370,371 Applications of universal frequency translation 106 1999
6,560,301 Integrated frequency translation and selectivity with a variety of filter embodiments 87 1999
6,580,902 Frequency translation using optimized switch structures 90 1999
6,687,493 Method and circuit for down-converting a signal using a complementary FET structure for improved dynamic range 90 1999
6,266,518 Method and system for down-converting electromagnetic signals by sampling and integrating over apertures 107 1999
6,421,534 Integrated frequency translation and selectivity 113 1999
6,647,250 Method and system for ensuring reception of a communications signal 94 1999
6,353,735 MDG method for output signal generation 97 1999
6,704,549 Multi-mode, multi-band communication system 96 2000
6,704,558 Image-reject down-converter and embodiments thereof, such as the family radio service 91 2000
7,006,805 Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service 64 2000
7,209,725 Analog zero if FM decoder and embodiments thereof, such as the family radio service 50 2000
6,634,555 Bar code scanner using universal frequency translation technology for up-conversion and down-conversion 84 2000
6,853,690 Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments 76 2000
6,879,817 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 71 2000
7,110,435 Spread spectrum applications of universal frequency translation 65 2000
6,798,351 Automated meter reader applications of universal frequency translation 79 2000
7,039,372 Method and system for frequency up-conversion with modulation embodiments 64 2000
7,065,162 Method and system for down-converting an electromagnetic signal, and transforms for same 70 2000
7,515,896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 30 2000
7,295,826 Integrated frequency translation and selectivity with gain control functionality, and applications thereof 48 2000
6,694,128 Frequency synthesizer using universal frequency translation technology 88 2000
6,873,836 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 79 2000
7,027,786 Carrier and clock recovery using universal frequency translation 59 2000
7,321,735 Optical down-converter using universal frequency translation technology 42 2000
7,082,171 Phase shifting applications of universal frequency translation 63 2000
7,054,296 Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation 155 2000
7,072,390 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 62 2000
7,110,444 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 64 2000
7,292,835 Wireless and wired cable modem applications of universal frequency translation technology 47 2001
7,379,515 Phased array antenna applications of universal frequency translation 44 2001
6,813,485 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 96 2001
7,010,286 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 68 2001
7,085,335 Method and apparatus for reducing DC offsets in a communication system 62 2001
7,010,559 Method and apparatus for a parallel correlator and applications thereof 70 2001
7,016,663 Applications of universal frequency translation 60 2002
7,236,754 Method and system for frequency up-conversion 52 2002
7,050,508 Method and system for frequency up-conversion with a variety of transmitter configurations 55 2002
7,379,883 Networking methods and systems 40 2002
7,460,584 Networking methods and systems 30 2002
7,072,427 Method and apparatus for reducing DC offsets in a communication system 76 2002
6,975,848 Method and apparatus for DC offset removal in a radio frequency communication channel 63 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 43 2002
7,272,164 Reducing DC offsets using spectral spreading 47 2002
6,963,734 Differential frequency down-conversion using techniques of universal frequency translation technology 69 2002
7,190,941 Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology 50 2002
7,224,749 Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology 49 2002
6,836,650 Methods and systems for down-converting electromagnetic signals, and applications thereof 80 2002
7,076,011 Integrated frequency translation and selectivity 58 2003
7,389,100 Method and circuit for down-converting a signal 39 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 41 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 31 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 43 2004
7,107,028 Apparatus, system, and method for up converting electromagnetic signals 57 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 52 2004
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 18 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 41 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 31 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 29 2004
7,773,688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 20 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 50 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 23 2005
7,245,886 Method and system for frequency up-conversion with modulation embodiments 48 2005
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 29 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 84 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 34 2005
7,218,907 Method and circuit for down-converting a signal 50 2005
7,697,916 Applications of universal frequency translation 21 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 39 2006
7,653,158 Gain control in a communication channel 24 2006
7,693,230 Apparatus and method of differential IQ frequency up-conversion 21 2006
7,724,845 Method and system for down-converting and electromagnetic signal, and transforms for same 22 2006
7,599,421 Spread spectrum applications of universal frequency translation 27 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 29 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 31 2007
7,554,508 Phased array antenna applications on universal frequency translation 31 2008
7,826,817 Applications of universal frequency translation 19 2009
 
MOTOROLA, INC. (24)
4,369,522 Singly-balanced active mixer circuit 99 1979
4,389,579 Sample and hold circuit 105 1981
4,562,414 Digital frequency modulation system and method 67 1983
4,596,046 Split loop AFC system for a SSB receiver 45 1984
4,785,463 Digital global positioning system receiver 421 1985
4,675,882 FM demodulator 139 1985
4,653,117 Dual conversion FM receiver using phase locked direct conversion IF 168 1985
4,733,403 Digital zero IF selectivity section 121 1986
4,893,316 Digital radio frequency receiver 301 1986
4,737,969 Spectrally efficient digital modulation method and apparatus 114 1987
4,811,362 Low power digital receiver 120 1987
4,857,928 Method and arrangement for a sigma delta converter for bandpass signals 140 1988
4,910,752 Low power digital receiver 140 1988
5,220,583 Digital FM demodulator with a reduced sampling rate 122 1988
4,931,921 Wide bandwidth frequency doubler 105 1989
5,003,621 Direct conversion FM receiver 163 1989
5,212,827 Zero intermediate frequency noise blanker 132 1991
5,444,865 Generating transmit injection from receiver first and second injections 110 1991
5,410,743 Active image separation mixer 114 1993
5,422,909 Method and apparatus for multi-phase component downconversion 128 1993
5,410,270 Differential amplifier circuit having offset cancellation and method therefor 138 1994
5,465,410 Method and apparatus for automatic frequency and bandwidth control 134 1994
5,519,890 Method of selectively reducing spectral components in a wideband radio frequency signal 116 1995
5,699,006 DC blocking apparatus and technique for sampled data filters 103 1996
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (19)
4,591,736 Pulse signal amplitude storage-holding apparatus 106 1982
4,868,654 Sub-nyquist sampling encoder and decoder of a video system 119 1988
5,361,408 Direct conversion receiver especially suitable for frequency shift keying (FSK) modulated signals 108 1991
5,319,799 Signal oscillation method for time-division duplex radio transceiver and apparatus using the same 126 1992
5,369,789 Burst signal transmitter 126 1994
5,617,451 Direct-conversion receiver for digital-modulation signal with signal strength detection 110 1994
5,757,870 Spread spectrum communication synchronizing method and its circuit 98 1995
5,600,680 High frequency receiving apparatus 92 1995
5,640,428 Direct conversion receiver 109 1995
5,760,629 DC offset compensation device 89 1996
5,818,869 Spread spectrum communication synchronizing method and its circuit 97 1997
6,067,329 VSB demodulator 98 1997
5,903,178 Semiconductor integrated circuit 120 1997
5,945,660 Communication system for wireless bar code reader 148 1997
6,275,542 Direct conversion receiver including mixer down-converting incoming signal, and demodulator operating on downconverted signal 53 1998
6,178,319 Microwave mixing circuit and down-converter 83 1998
6,363,126 Demodulator 39 1998
6,600,795 Receiving circuit 85 1999
6,313,700 Power amplifier and communication unit 63 2000
 
U.S. PHILIPS CORPORATION (15)
4,405,835 Receiver for AM stereo signals having a circuit for reducing distortion due to overmodulation 38 1981
4,488,119 FM Demodulator 88 1982
4,518,935 Band-rejection filter of the switched capacitor type 104 1983
4,743,858 R. F. power amplifier 150 1986
4,768,187 Signal transmission system and a transmitter and a receiver for use in the system 127 1986
4,890,302 Circuit for extracting carrier signals 104 1987
4,845,389 Very high frequency mixer 77 1988
4,968,958 Broad bandwidth planar power combiner/divider device 38 1989
5,113,129 Apparatus for processing sample analog electrical signals 111 1989
5,241,561 Radio receiver 134 1991
5,159,710 Zero IF receiver employing, in quadrature related signal paths, amplifiers having substantially sinh.sup.-1 transfer characteristics 110 1991
5,619,538 Pulse shaping FM demodular with low noise where capacitor charge starts on input signal edge 101 1995
5,903,609 Transmission system using transmitter with phase modulator and frequency multiplier 111 1996
5,793,817 DC offset reduction in a transmitter 107 1996
6,112,061 Radio communication device 51 1998
 
MOTOROLA MOBILITY LLC (12)
5,423,082 Method for a transmitter to compensate for varying loading without an isolator 123 1993
5,579,341 Multi-channel digital transceiver and method 137 1994
5,668,836 Split frequency band signal digitizer and method 124 1994
5,748,683 Multi-channel transceiver having an adaptive antenna array and method 121 1995
5,710,998 Method and apparatus for improved zero intermediate frequency receiver latency 113 1995
5,705,955 Frequency locked-loop using a microcontroller as a comparator 132 1995
5,901,347 Fast automatic gain control circuit and method for zero intermediate frequency receivers and radiotelephone using same 121 1996
5,689,413 Voltage convertor for a portable electronic device 111 1996
5,901,344 Method and apparatus for improved zero intermediate frequency receiver latency 103 1997
5,949,827 Continuous integration digital demodulator for use in a communication device 90 1997
6,321,073 Radiotelephone receiver and method with improved dynamic range and DC offset correction 118 2000
6,625,470 Transmitter 51 2000
 
NEC CORPORATION (12)
4,806,790 Sample-and-hold circuit 117 1988
4,841,265 Surface acoustic wave filter 95 1988
5,091,921 Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency 113 1990
5,260,973 Device operable with an excellent spectrum suppression 85 1991
5,196,806 Output level control circuit for use in RF power amplifier 118 1991
5,410,195 Ripple-free phase detector using two sample-and-hold circuits 71 1992
5,353,306 Tap-weight controller for adaptive matched filter receiver 122 1992
5,379,040 Digital-to-analog converter 103 1993
5,339,054 Modulated signal transmission system compensated for nonlinear and linear distortion 122 1993
5,784,689 Output control circuit for transmission power amplifying circuit 126 1995
6,175,728 Direct conversion receiver capable of canceling DC offset voltages 131 1998
6,332,007 Automatic frequency control in FSK receiver using voltage window deviation 37 1998
 
LUCENT TECHNOLOGIES INC. (11)
5,724,653 Radio receiver with DC offset correction circuit 185 1994
5,745,846 Channelized apparatus for equalizing carrier powers of multicarrier signal 122 1995
5,602,847 Segregated spectrum RF downconverter for digitization systems 120 1995
5,767,726 Four terminal RF mixer device 110 1996
6,298,065 Method for multi-mode operation of a subscriber line card in a telecommunications system 70 1997
6,078,630 Phase-based receiver with multiple sampling frequencies 86 1998
6,167,247 Local oscillator leak cancellation circuit 41 1998
6,198,941 Method of operating a portable communication device 116 1998
6,618,579 Tunable filter with bypass 101 1999
6,437,639 Programmable RC filter 91 2000
2002/0132,642 Common module combiner/active array multicarrier approach without linearization loops 57 2001
 
QUALCOMM INCORPORATED (11)
5,446,422 Dual mode FM and DQPSK modulator 122 1994
5,757,858 Dual-mode digital FM communication system 170 1997
5,896,562 Transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands 186 1997
5,982,315 Multi-loop .SIGMA. .DELTA. analog to digital converter 141 1997
6,005,506 Receiver with sigma-delta analog-to-digital converter for sampling a received signal 127 1997
6,137,321 Linear sampling switch 39 1999
6,088,348 Configurable single and dual VCOs for dual- and tri-band wireless communication systems 68 1999
6,366,622 Apparatus and method for wireless communications 288 1999
6,973,476 System and method for communicating data via a wireless high speed link 71 2000
6,731,146 Method and apparatus for reducing PLL lock time 52 2000
6,909,739 Signal acquisition system for spread spectrum receiver 64 2000
 
ROCKWELL INTERNATIONAL CORPORATION (11)
4,241,451 Single sideband signal demodulator 91 1978
4,253,067 Baseband differentially phase encoded radio signal detector 122 1978
4,363,976 Subinterval sampler 49 1981
4,463,320 Automatic gain control circuit 37 1982
4,484,143 CCD Demodulator circuit 93 1982
4,772,853 Digital delay FM demodulator with filtered noise dither 88 1987
4,814,649 Dual gate FET mixing apparatus with feedback means 74 1987
5,095,533 Automatic gain control system for a direct conversion receiver 118 1990
5,095,536 Direct conversion receiver with tri-phase architecture 137 1990
5,249,203 Phase and gain error control system for use in an I/Q direct conversion receiver 154 1991
5,564,097 Spread intermediate frequency radio receiver with adaptive spurious rejection 102 1994
 
MOTOROLA SOLUTIONS, INC. (10)
5,389,839 Integratable DC blocking circuit 94 1993
5,559,468 Feedback loop closure in a linear transmitter 43 1993
5,483,691 Zero intermediate frequency receiver having an automatic gain control circuit 145 1994
5,801,654 Apparatus and method for frequency translation in a communication device 107 1995
5,602,868 Multiple-modulation communication system 158 1995
5,898,912 Direct current (DC) offset compensation method and apparatus 125 1996
5,903,196 Self centering frequency multiplier 105 1997
6,121,819 Switching down conversion mixer for use in multi-stage receiver architectures 102 1998
5,973,570 Band centering frequency multiplier 40 1998
6,225,848 Method and apparatus for settling and maintaining a DC offset 106 2000
 
SONY CORPORATION (10)
4,220,977 Signal transmission circuit 93 1978
4,439,787 AFT Circuit 63 1982
4,612,464 High speed buffer circuit particularly suited for use in sample and hold circuits 106 1984
5,172,070 Apparatus for digitally demodulating a narrow band modulated signal 109 1991
5,608,531 Video signal recording apparatus 103 1994
6,097,762 Communication system 41 1995
5,633,610 Monolithic microwave integrated circuit apparatus 65 1995
5,903,854 High-frequency amplifier, transmitting device and receiving device 180 1996
6,801,253 Solid-state image sensor and method of driving same 90 1998
6,910,015 Sales activity management system, sales activity management apparatus, and sales activity management method 59 2001
 
FREESCALE SEMICONDUCTOR, INC. (8)
5,263,196 Method and apparatus for compensation of imbalance in zero-if downconverters 130 1990
5,551,076 Circuit and method of series biasing a single-ended mixer 62 1994
6,160,280 Field effect transistor 91 1996
5,787,125 Apparatus for deriving in-phase and quadrature-phase baseband signals from a communication signal 87 1996
5,729,577 Signal processor with improved efficiency 133 1996
5,870,670 Integrated image reject mixer 132 1996
5,892,380 Method for shaping a pulse width and circuit therefor 113 1997
6,144,846 Frequency translation circuit and method of translating 112 1997
 
MITSUBISHI DENKI KABUSHIKI KAISHA (8)
4,485,347 Digital FSK demodulator 65 1981
4,651,034 Analog input circuit with combination sample and hold and filter 111 1984
5,251,232 Radio communication apparatus 185 1991
5,751,154 capacitive sensor interface circuit 108 1996
5,903,595 Digital matched filter 122 1997
6,259,293 Delay circuitry, clock generating circuitry, and phase synchronization circuitry 92 1999
6,600,911 Even harmonic direct-conversion receiver, and a transmitting and receiving apparatus using the same 93 2000
6,876,846 High frequency module 43 2001
 
NOKIA MOBILE PHONES LTD. (8)
5,697,074 Dual rate power control loop for a transmitter 154 1995
5,734,683 Demodulation of an intermediate frequency signal by a sigma-delta converter 79 1996
6,014,551 Arrangement for transmitting and receiving radio frequency signal at two frequency bands 161 1997
6,073,001 Down conversion mixer 96 1998
6,317,589 Radio receiver and method of operation 99 1998
6,438,366 Method and circuit for sampling a signal at high sampling frequency 71 1999
2002/0098,823 METHOD AND CIRCUIT FOR SAMPLING A SIGNAL AT HIGH SAMPLING FREQUENCY 30 1999
2002/0172,293 Non-zero complex weighted space-time code for multiple antenna transmission 1 2001
 
FUJITSU LIMITED (7)
4,870,659 FSK demodulation circuit 106 1988
5,760,632 Double-balanced mixer circuit 91 1996
6,011,435 Transmission-line loss equalizing circuit 94 1997
5,914,622 Pulse-width controller 107 1997
5,834,979 Automatic frequency control apparatus for stabilization of voltage-controlled oscillator 88 1997
5,844,449 Gilbert cell phase modulator having two outputs combined in a balun 106 1997
6,091,941 Radio apparatus 137 1998
 
INTEL CORPORATION (7)
5,412,352 Modulator having direct digital synthesis for broadband RF transmission 152 1994
5,648,985 Universal radio architecture for low-tier personal communication system 112 1994
5,790,587 Multi-band, multi-mode spread-spectrum communication system 120 1995
6,072,996 Dual band radio receiver 54 1997
6,150,890 Dual band transmitter for a cellular phone comprising a PLL 114 1998
6,516,185 Automatic gain control and offset correction 129 2000
2004/0125,879 Information transmission unit 59 2002
 
KABUSHIKI KAISHA TOSHIBA (7)
4,734,591 Frequency doubler 109 1986
5,124,592 Active filter 102 1991
5,742,189 Frequency conversion circuit and radio communication apparatus with the same 137 1995
5,634,207 Frequency converter capable of reducing noise components in local oscillation signals 82 1996
6,204,789 Variable resistor circuit and a digital-to-analog converter 94 2000
7,197,081 System and method for receiving OFDM signal 39 2001
6,690,232 Variable gain amplifier 114 2002
 
SIEMENS AKTIENGESELLSCHAFT (7)
4,253,069 Filter circuit having a biquadratic transfer function 99 1979
4,430,629 Electrical filter circuit operated with a definite sampling and clock frequency f.sub.T which consists of CTD elements 100 1981
4,628,517 Digital radio system 131 1985
4,726,041 Digital filter switch for data receiver 105 1986
5,115,409 Multiple-input four-quadrant multiplier 124 1989
5,020,154 Transmission link 103 1990
5,014,130 Signal level control circuit having alternately switched capacitors in the feedback branch 68 1990
 
SKYWORKS SOLUTIONS, INC. (7)
5,523,719 Component insensitive, analog bandpass filter 103 1994
5,757,864 Receiver with filters offset correction 32 1995
5,778,022 Extended time tracking and peak energy in-window demodulation for use in a direct sequence spread spectrum system 116 1995
6,125,271 Front end filter circuitry for a dual band GSM/DCS cellular phone 105 1998
6,057,714 Double balance differential active ring mixer with current shared active input balun 127 1998
6,404,823 Envelope feedforward technique with power control for efficient linear RF power amplification 154 1998
6,307,894 Power amplification using a direct-upconverting quadrature mixer topology 137 1999
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (7)
RE37138 Log-polar signal processing 55 1993
5,628,055 Modular radio communications system 311 1994
5,579,347 Digitally compensated direct conversion receiver 129 1994
5,793,801 Frequency domain signal reconstruction compensating for phase adjustments to a sampling signal 133 1996
6,385,439 Linear RF power amplifier with optically activated switches 121 1997
6,400,963 Harmonic suppression in dual band mobile phones 105 1999
6,892,057 Method and apparatus for reducing dynamic range of a power amplifier 60 2002
 
TEXAS INSTRUMENTS INCORPORATED (7)
4,481,642 Integrated circuit FSK modem 109 1981
4,862,121 Switched capacitor filter 113 1987
5,444,415 Modulation and demodulation of plural channels using analog and digital components 121 1994
6,031,217 Apparatus and method for active integrator optical sensors 97 1998
6,144,331 Analog to digital converter with a differential output resistor-digital-to-analog-converter for improved noise reduction 111 1998
6,445,726 Direct conversion radio receiver using combined down-converting and energy spreading mixing signal 71 1999
7,358,801 Reducing noise and/or power consumption in a switched capacitor amplifier sampling a reference voltage 33 2005
 
UNWIRED PLANET, LLC (7)
5,680,418 Removing low frequency interference in a digital FM receiver 110 1994
5,834,985 Digital continuous phase modulation for a DDS-driven phase locked loop 117 1996
6,215,828 Signal transformation method and apparatus 95 1997
6,192,225 Direct conversion receiver 68 1998
6,611,569 Down/up-conversion apparatus and method 88 1998
6,567,483 Matched filter using time-multiplexed precombinations 65 1999
6,546,061 Signal transformation method and apparatus 36 2001
 
BELL TELEPHONE LABORATORIES, INCORPORATED (6)
4,360,867 Broadband frequency multiplication by multitransition operation of step recovery diode 105 1980
4,441,080 Amplifier with controlled gain 136 1981
4,479,226 Frequency-hopped single sideband mobile radio system 208 1982
4,612,518 QPSK modulator or demodulator using subharmonic pump carrier signals 107 1985
4,873,492 Amplifier with modulated resistor gain control 127 1988
5,012,245 Integral switched capacitor FIR filter/digital-to-analog converter for sigma-delta encoded digital audio 124 1989
 
LOCKHEED MARTIN CORPORATION (6)
4,356,558 Optimum second order digital filter 119 1979
4,885,671 Pulse-by-pulse current mode controlled power supply 65 1988
4,896,152 Telemetry system with a sending station using recursive filter for bandwidth limiting 106 1989
4,888,557 Digital subharmonic sampling down-converter 134 1989
5,020,745 Reaction wheel fricton compensation using dither 29 1989
5,400,363 Quadrature compensation for orthogonal signal channels 30 1993
 
RAYTHEON COMPANY (6)
4,616,191 Multifrequency microwave source 102 1983
4,634,998 Fast phase-lock frequency synthesizer with variable sampling efficiency 110 1985
4,810,904 Sample-and-hold phase detector circuit 106 1988
4,955,079 Waveguide excited enhancement and inherent rejection of interference in a subharmonic mixer 117 1989
5,884,154 Low noise mixer circuit having passive inductor elements 86 1996
6,147,340 Focal plane readout unit cell background suppression circuit and method 105 1998
 
THOMSON-CSF (6)
4,365,217 Charge-transfer switched-capacity filter 100 1980
4,392,255 Compact subharmonic mixer for EHF wave receiver using a single wave guide and receiver utilizing such a mixer 104 1981
4,363,132 Diversity radio transmission system having a simple and economical structure 103 1981
4,485,488 Microwave subharmonic mixer device 119 1982
4,688,237 Device for generating a fractional frequency of a reference frequency 44 1984
4,967,160 Frequency multiplier with programmable order of multiplication 124 1989
 
APPLE INC. (5)
5,471,665 Differential DC offset compensation circuit 168 1994
5,606,731 Zerox-IF receiver with tracking second local oscillator and demodulator phase locked loop oscillator 106 1995
5,918,167 Quadrature downconverter local oscillator leakage canceller 80 1997
6,094,084 Narrowband LC folded cascode structure 111 1998
6,327,313 Method and apparatus for DC offset correction 103 1999
 
CANON KABUSHIKI KAISHA (5)
5,267,023 Signal processing device 103 1991
5,465,071 Information signal processing apparatus 102 1995
5,771,442 Dual mode transmitter 115 1995
5,844,868 Digital-analog shared circuit in dual mode radio equipment 100 1997
6,459,721 Spread spectrum receiving apparatus 86 1998
 
ERICSSON INC. (5)
5,909,460 Efficient apparatus for simultaneous modulation and digital beamforming for an antenna array 135 1995
5,894,496 Method and apparatus for detecting and compensating for undesired phase shift in a radio transceiver 149 1996
5,834,987 Frequency synthesizer systems and methods for three-point modulation with a DC response 135 1997
6,408,018 Complex matched filter with reduced power consumption 19 1999
6,404,758 System and method for achieving slot synchronization in a wideband CDMA system in the presence of large initial frequency errors 69 1999
 
RCA CORPORATION (5)
4,204,171 Filter which tracks changing frequency of input signal 102 1978
4,286,283 Transcoder 71 1979
4,483,017 Pattern recognition system using switched capacitors 93 1981
4,393,395 Balanced modulator with feedback stabilization of carrier balance 98 1981
4,651,210 Adjustable gamma controller 48 1984
 
SYMBOL TECHNOLOGIES, INC. (5)
5,157,687 Packet data communication network 284 1990
5,809,060 High-data-rate wireless local-area network 185 1994
6,215,475 Highly integrated portable electronic work slate unit 107 1995
6,330,244 System for digital radio communication between a wireless lan and a PBX 280 1998
6,098,886 Glove-mounted system for reading bar code symbols 104 1998
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY (5)
6,531,979 Adaptive time-compression stabilizer 85 1970
4,660,164 Multiplexed digital correlator 208 1983
5,535,402 System for (N.cndot.M)-bit correlation using N M-bit correlators 61 1992
5,663,986 Apparatus and method of transmitting data over a coaxial cable in a noisy environment 106 1996
5,883,548 Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier 97 1997
 
WI-LAN INC. (5)
5,282,222 Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum 408 1992
5,428,638 Method and apparatus for reducing power consumption in digital communications devices 111 1993
5,732,333 Linear transmitter using predistortion 227 1996
6,018,553 Multi-level mixer architecture for direct conversion of FSK signals 108 1996
5,881,375 Paging transmitter having broadband exciter using an intermediate frequency above the transmit frequency 100 1997
 
GENERAL ELECTRIC COMPANY (4)
4,902,979 Homodyne down-converter with digital Hilbert transform filtering 121 1989
4,982,353 Subsampling time-domain digital filter using sparsely clocked output latch 122 1989
5,896,304 Low power parallel correlator for measuring correlation between digital signal segments 124 1997
6,028,887 Power efficient receiver 132 1997
 
IBIQUITY DIGITAL CORPORATION (4)
5,278,826 Method and apparatus for digital audio broadcasting and reception 151 1991
5,315,583 Method and apparatus for digital audio broadcasting and reception 185 1991
5,523,726 Digital quadriphase-shift keying modulator 106 1994
5,768,323 Symbol synchronizer using modified early/punctual/late gate technique 118 1994
 
MITEL SEMICONDUCTOR LIMITED (4)
5,303,417 Mixer for direct conversion receiver 153 1991
5,451,899 Direct conversion FSK receiver using frequency tracking filters 108 1994
6,211,718 Low voltage double balanced mixer 79 1998
6,308,058 Image reject mixer 99 1998
 
MURATA MANUFACTURING CO., LTD. (4)
5,694,096 Surface acoustic wave filter 110 1996
5,770,985 Surface acoustic wave filter 101 1996
5,680,078 Mixer 105 1996
5,903,421 High-frequency composite part 110 1997
 
RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE (4)
4,334,324 Complementary symmetry FET frequency converter circuits 100 1980
4,603,300 Frequency modulation detector using digital signal vector processing 107 1984
4,745,463 Generalized chrominance signal demodulator for a sampled data television signal processing system 109 1986
4,819,252 Sampled data subsampling apparatus 108 1988
 
SAMSUNG ELECTRONICS CO., LTD. (4)
5,321,852 Circuit and method for converting a radio frequency signal into a baseband signal 133 1991
5,604,732 Up-link access apparatus in direct sequence code division multiple access system 125 1994
5,659,372 Digital TV detector responding to final-IF signal with vestigial sideband below full sideband in frequency 44 1995
5,825,254 Frequency converter for outputting a stable frequency by feedback via a phase locked loop 124 1997
 
SCIENTIFIC-ATLANTA, INC. (4)
5,191,459 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 140 1989
5,230,097 Offset frequency converter for phase/amplitude data measurement receivers 112 1990
5,379,141 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 109 1992
5,500,758 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 112 1994
 
TEKTRONIX, INC. (4)
4,621,217 Anti-aliasing filter circuit for oscilloscopes 112 1984
4,751,468 Tracking sample and hold phase detector 105 1986
4,757,538 Separation of L+R from L-R in BTSC system 109 1986
4,688,253 L+R separation system 103 1986
 
ALCATEL TELSPACE (3)
5,490,176 Detecting false-locking and coherent digital demodulation using the same 94 1992
5,416,803 Process for digital transmission and direct conversion receiver 125 1993
5,760,645 Demodulator stage for direct demodulation of a phase quadrature modulated signal and receiver including a demodulator stage of this kind 103 1996
 
ECHELON CORPORATION (3)
5,239,686 Transceiver with rapid mode switching capability 139 1991
5,404,127 Power line communication while avoiding determinable interference harmonics 153 1993
5,355,114 Reconstruction of signals using redundant channels 167 1994
 
GOOGLE INC. (3)
6,041,073 Multi-clock matched filter for receiving signals with multipath 99 1998
6,823,178 High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation 74 2001
6,741,139 Optical to microwave converter using direct modulation phase shift keying 72 2002
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (3)
5,428,640 Switch circuit for setting and signaling a voltage level 101 1992
5,705,949 Compensation method for I/Q channel imbalance errors 145 1996
5,768,118 Reciprocating converter 125 1996
 
HITACHI AMERICA, LTD. (3)
5,282,023 Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters 155 1992
5,400,084 Method and apparatus for NTSC signal interference cancellation using recursive digital notch filters 151 1993
5,325,204 Narrowband interference cancellation through the use of digital recursive notch filters 137 1993
 
HITACHI DENSHI KABUSHIKI KAISHA (3)
5,512,946 Digital video signal processing device and TV camera device arranged to use it 40 1995
5,926,065 Digital modulator having a digital filter including low-speed circuit components 98 1997
6,512,798 Digital communication system of orthogonal modulation type 41 1999
 
HUGHES ELECTRONICS CORPORATION (3)
4,995,055 Time shared very small aperture satellite terminals 141 1988
5,390,215 Multi-processor demodulator for digital cellular base station employing partitioned demodulation procedure with pipelined execution 79 1992
5,495,202 High spectral purity digital waveform synthesizer 115 1993
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (3)
5,894,239 Single shot with pulse width controlled by reference oscillator 104 1997
5,872,446 Low voltage CMOS analog multiplier with extended input dynamic range 108 1997
6,128,746 Continuously powered mainstore for large memory subsystems 97 1997
 
INTERSIL CORPORATION (3)
5,493,581 Digital down converter and method 114 1992
5,633,815 Formatter 91 1995
5,841,324 Charge-based frequency locked loop and method 94 1996
 
ITT MANUFACTURING ENTERPRISES, INC. (3)
5,126,682 Demodulation method and apparatus incorporating charge coupled devices 111 1991
5,483,549 Receiver having for charge-coupled-device based receiver signal processing 202 1994
5,557,641 Charge-coupled-device based transmitters and receivers 104 1994
 
LAWRENCE LIVERMORE NATIONAL SECURITY, LLC (3)
5,471,162 High speed transient sampler 141 1992
5,479,120 High speed sampler and demultiplexer 140 1994
5,523,760 Ultra-wideband receiver 204 1994
 
M&FC HOLDING, LLC (3)
RE35829 Binary phase shift keying modulation system and/or frequency multiplier 137 1995
5,999,561 Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset 200 1997
6,639,939 Direct sequence spread spectrum method computer-based product apparatus and system tolerant to frequency reference offset 137 1999
 
PROTOCOL-IP.COM, L.L.C. (3)
4,944,025 Direct conversion FM receiver with offset 181 1988
4,893,341 Digital receiver operating at sub-nyquist sampling rate 108 1989
5,263,194 Zero if radio receiver for intermittent operation 133 1990
 
SHARP KABUSHIKI KAISHA (3)
5,444,416 Digital FM demodulation apparatus demodulating sampled digital FM modulated wave 101 1994
5,960,033 Matched filter 107 1997
6,775,684 Digital matched filter 57 2000
 
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY (3)
5,479,447 Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines 643 1993
5,640,698 Radio frequency signal reception using frequency shifting by discrete-time sub-sampling down-conversion 194 1995
6,963,626 Noise-reducing arrangement and method for signal processing 80 1999
 
VICTOR COMPANY OF JAPAN, LTD. (3)
4,472,785 Sampling frequency converter 144 1981
4,984,077 Signal converting apparatus 120 1989
5,539,770 Spread spectrum modulating apparatus using either PSK or FSK primary modulation 107 1994
 
VISTEON GLOBAL TECHNOLOGIES, INC. (3)
5,222,144 Digital quadrature radio receiver with two-step processing 145 1991
5,490,173 Multi-stage digital RF translator 112 1993
5,483,193 Circuit for demodulating FSK signals 106 1995
 
YAMAHA CORPORATION (3)
4,801,823 Sample hold circuit 102 1987
5,499,267 Spread spectrum communication system 106 1993
6,018,262 CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter 92 1998
 
ALCATEL N.V. (2)
4,718,113 Zero-IF receiver wih feedback loop for suppressing interfering signals 122 1986
5,933,467 Multirate receive device and method using a single adaptive interpolation filter 109 1996
 
AT&T CORP. (2)
5,481,570 Block radio and adaptive arrays for wireless systems 162 1993
5,515,014 Interface between SAW filter and Gilbert cell mixer 127 1994
 
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY (2)
5,065,409 FSK discriminator 102 1989
5,777,771 Generation of optical signals with RF components 118 1996
 
CDC PROPRIETE INTELLECTUELLE (2)
6,230,000 Product detector and method therefor 99 1998
6,441,694 Method and apparatus for generating digitally modulated signals 61 2000
 
CIRRUS LOGIC, INC. (2)
6,084,465 Method for time constant tuning of gm-C filters 99 1998
6,597,240 Circuits and methods for slew rate control and current limiting in switch-mode systems 66 2001
 
DAITA FRONTIER FUND, LLC (2)
6,084,922 Waiting circuit 96 1998
6,512,785 Matched filter bank 60 1999
 
EASTMAN KODAK COMPANY (2)
4,591,930 Signal processing for high resolution electronic still camera 70 1983
4,791,584 Sub-nyquist interferometry 126 1986
 
EFRATOM TIME AND FREQUENCY PRODUCTS, INC. (2)
5,714,910 Methods and apparatus for digital frequency generation in atomic frequency standards 101 1994
5,721,514 Digital frequency generation in atomic frequency standards using digital phase shifting 108 1996
 
EXELIS INC. (2)
5,729,829 Interference mitigation method and apparatus for multiple collocated transceivers 115 1996
5,901,348 Apparatus for enhancing sensitivity in compressive receivers and method for the same 100 1997
 
GTE LENKURT INCORPORATED (2)
4,504,803 Switched capacitor AM modulator/demodulator 104 1982
4,510,467 Switched capacitor DSB modulator/demodulator 87 1982
 
HARRIS CORPORATION (2)
5,390,364 Least-mean squares adaptive digital filter havings variable size loop bandwidth 125 1992
5,337,014 Phase noise measurements utilizing a frequency down conversion/multiplier, direct spectrum measurement technique 154 1992
 
HUGHES AIRCRAFT COMPANY (2)
4,470,145 Single sideband quadricorrelator 114 1982
4,740,792 Vehicle location system 282 1986
 
INFINEON TECHNOLOGIES AG (2)
5,953,642 System for contactless power and data transmission 102 1997
6,633,194 Mixer 76 2001
 
INTELLECTUAL KEYSTONE TECHNOLOGY LLC (2)
2005/0156,168 System and methods for driving an electro-optical device 1 2005
2005/0156,168 System and methods for driving an electro-optical device 1 2005
 
INTELLECTUAL VENTURES II LLC (2)
5,661,424 Frequency hopping synthesizer using dual gate amplifiers 111 1993
6,246,695 Variable rate and variable mode transmission system 112 1998
 
KABUSHIKI KAISHA KENWOOD (2)
4,871,987 FSK or am modulator with digital waveform shaping 105 1988
4,855,894 Frequency converting apparatus 99 1988
 
KONINKLIJKE PHILIPS ELECTRONICS N.V. (2)
6,393,070 Digital communication device and a mixer 72 1998
2003/0149,579 Method of increasing functionality of a product 58 2002
 
LOT 41 ACQUISITION FOUNDATION, LLC (2)
5,955,992 Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter 128 1998
6,686,879 Method and apparatus for transmitting and receiving signals having a carrier interferometry architecture 115 2001
 
MARCONI INSTRUMENTS LIMITED (2)
4,320,361 Amplitude and frequency modulators using a switchable component controlled by data signals 109 1979
4,914,405 Frequency synthesizer 101 1988
 
MARTINEZ,MICHAEL G. (2)
5,434,546 Circuit for simultaneous amplitude modulation of a number of signals 102 1993
5,463,356 FM band multiple signal modulator 104 1994
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (2)
5,841,811 Quadrature sampling system and hybrid equalizer 105 1996
6,049,573 Efficient polyphase quadrature digital tuner 102 1997
 
MEDIATEK INC. (2)
6,335,656 Direct conversion receivers and filters adapted for use therein 95 1999
2003/0078,011 Method for integrating a plurality of radio systems in a unified transceiver structure and the device of the same 58 2002
 
NXP B.V. (2)
5,052,050 Direct conversion FM receiver 117 1989
5,584,068 Direct conversion receiver 135 1995
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION (2)
5,574,755 I/Q quadraphase modulator circuit 122 1994
6,314,279 Frequency offset image rejection 98 1998
 
ROBERT BOSCH GMBH (2)
5,900,747 Sampling phase detector 104 1998
6,147,763 Circuitry for processing signals occurring in a heterodyne interferometer 97 1999
 
SGS-THOMSON MICROELECTRONICS S.R.L. (2)
5,014,304 Method of reconstructing an analog signal, particularly in digital telephony applications, and a circuit device implementing the method 101 1990
RE35494 Integrated active low-pass filter of the first order 100 1994
 
SMALL POWER COMMUNICATION SYSTEMS RESEARCH LABORATORIES CO., LTD. (2)
5,369,800 Multi-frequency communication system with an improved diversity scheme 122 1992
5,448,602 Diversity radio receiver 109 1993
 
SONY ELECTRONICS INC. (2)
5,675,392 Mixer with common-mode noise rejection 113 1996
6,014,176 Automatic phase control apparatus for phase locking the chroma burst of analog and digital video data using a numerically controlled oscillator 94 1996
 
STC PLC (2)
4,521,892 Direct conversion radio receiver for FM signals 118 1982
4,583,239 Digital demodulator arrangement for quadrature signals 113 1984
 
TELASIC COMMUNICATIONS (2)
5,058,107 Efficient digital frequency division multiplexed signal receiver 94 1989
5,251,218 Efficient digital frequency division multiplexed signal receiver 132 1991
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (2)
5,015,963 Synchronous demodulator 102 1989
6,182,011 Method and apparatus for determining position using global positioning satellites 90 1998
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE ARMY (2)
4,563,773 Monolithic planar doped barrier subharmonic mixer 110 1984
5,982,329 Single channel transceiver with polarization diversity 84 1998
 
THOMSON CONSUMER ELECTRONICS, INC. (2)
5,446,421 Local oscillator phase noise cancelling modulation technique 108 1994
5,878,088 Digital variable symbol timing recovery system for QAM 97 1997
 
TRW INC. (2)
4,370,572 Differential sample-and-hold circuit 117 1980
6,813,320 Wireless telecommunications multi-carrier receiver architecture 48 2000
 
YOZAN INC. (2)
5,812,546 Demodulator for CDMA spread spectrum communication using multiple pn codes 100 1997
6,366,765 Receiver 36 1999
 
ZARBANA DIGITAL FUND, LLC (2)
7,194,044 Up/down conversion circuitry for radio transceiver 56 2002
7,212,581 Up / down conversion circuitry for radio transceiver 52 2006
 
AAI CORPORATION (1)
5,764,087 Direct digital to analog microwave frequency signal simulator 103 1995
 
ACRODYNE INDUSTRIES, INC. (1)
5,724,002 Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) 103 1996
 
ADC TELECOMMUNICATIONS, INC. (1)
6,741,650 Architecture for intermediate frequency encoder 59 2000
 
ADVANCED MICRO DEVICES, INC. (1)
5,636,140 System and method for a flexible MAC layer interface in a wireless local area network 132 1995
 
AEL MICROTEL LIMITED (1)
4,481,490 Modulator utilizing high and low frequency carriers 102 1982
 
AEROFLEX PLAINVIEW, INC. (1)
5,970,053 Method and apparatus for controlling peak factor of coherent frequency-division-multiplexed systems 135 1996
 
AGENCE SPATIALE EUROPEENNE (1)
5,630,227 Satellite receiver having analog-to-digital converter demodulation 106 1995
 
AGILENT TECHNOLOGIES, INC. (1)
5,260,970 Protocol analyzer pod for the ISDN U-interface 117 1991
 
ALCATEL (1)
5,926,513 Receiver with analog and digital channel selectivity 103 1997
 
ALCATEL USA SOURCING, L.P. (1)
5,909,447 Class of low cross correlation palindromic synchronization sequences for time tracking in synchronous multiple access communication systems 108 1997
 
ALLIANT TECHSYSTEMS INC. (1)
5,150,124 Bandpass filter demodulation for FM-CW systems 103 1991
 
ALLIEDSIGNAL INC. (1)
5,805,460 Method for measuring RF pulse rise time, fall time and pulse width 70 1997
 
AMAZON TECHNOLOGIES, INC. (1)
7,865,817 Invariant referencing in digital works 8 2007
 
AMERICAN MICROSYSTEMS, INC. (1)
4,210,872 High pass switched capacitor filter section 124 1978
 
AMERICAN NEURALOGIX, INC. (1)
5,218,562 Hamming data correlator having selectable word-length 99 1991
 
AMERICAN RADIO LLC (1)
5,864,754 System and method for radio signal reconstruction using signal processor 111 1996
 
ANALOG DEVICES, INC. (1)
5,495,200 Double sampled biquad switched capacitor filter 116 1993
 
ANALYTEK, LTD. (1)
4,922,452 10 Gigasample/sec two-stage analog storage integrated circuit for transient digitizing and imaging oscillography 109 1987
 
ANDREW LLC (1)
6,697,603 Digital repeater 171 1999
 
ANRITSU COMPANY (1)
5,113,094 Method and apparatus for increasing the high frequency sensitivity response of a sampler frequency converter 111 1990
 
APHEX LLC (1)
5,483,600 Wave dependent compressor 89 1994
 
ASULAB S.A. (1)
2002/0167,995 Radiofrequency signal receiver with means for improving the reception dynamic of said signals 2002
 
AT&T INFORMATION SYSTEMS INC. (1)
4,716,376 Adaptive FSK demodulator and threshold detector 118 1985
 
ATC TECHNOLOGIES, LLC (1)
5,454,007 Arrangement for and method of concurrent quadrature downconversion input sampling of a bandpass signal 138 1993
 
ATMEL CORPORATION (1)
5,461,646 Synchronization apparatus for a diversity receiver 94 1995
 
BAKER HUGHES INCORPORATED (1)
5,682,099 Method and apparatus for signal bandpass sampling in measurement-while-drilling applications 121 1995
 
BLAUPUNKT-WERKE GMBH (1)
4,313,222 H-F Portion of TV receiver 47 1980
 
BROADCOM CORPORATION (1)
6,920,311 Adaptive radio transceiver with floating MOSFET capacitors 71 2004
 
BROWN UNIVERSITY RESEARCH FOUNDATION (1)
5,638,396 Laser ultrasonics-based material analysis system and method 108 1995
 
BULL HN INFORMATION SYSTEMS INC. (1)
5,887,001 Boundary scan architecture analog extension with direct connections 74 1997
 
BURR-BROWN CORPORATION (1)
5,172,019 Bootstrapped FET sampling switch 74 1992
 
CALLAHAN CELLULAR L.L.C. (1)
5,438,692 Direct conversion receiver 127 1993
 
CANADIAN SPACE AGENCY, THE, AN AGENCY OF THE GOVERNMENT OF CANADA (1)
5,592,131 System and method for modulating a carrier frequency 114 1994
 
CARDIAC PACEMAKERS, INC. (1)
6,076,015 Rate adaptive cardiac rhythm management device using transthoracic impedance 259 1998
 
CEDCOM NETWORK SYSTEMS, PTY. LTD. (1)
5,164,985 Passive universal communicator system 259 1990
 
CELLCO PARTNERSHIP D/B/A VERIZON WIRELESS (1)
5,220,680 Frequency signal generator apparatus and method for simulating interference in mobile communication systems 110 1991
 
CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
5,901,054 Pulse-width-modulation control circuit 104 1997
 
CIENA CORPORATION (1)
5,006,810 Second order active filters 104 1989
 
CIENCIA, INC. (1)
5,818,582 Apparatus and method for phase fluorometry 132 1997
 
CLARION CO., LTD. (1)
5,293,398 Digital matched filter 160 1992
 
CLEVELAND MEDICAL DEVICES INC. (1)
6,223,061 Apparatus for low power radio communications 82 1997
 
COASES INVESTMENTS BROS. L.L.C. (1)
5,793,818 Signal processing system 158 1995
 
COGNEX CORPORATION (1)
6,608,647 Methods and apparatus for charge coupled device image acquisition with independent integration and readout 86 1998
 
COMSAT CORPORATION (1)
4,943,974 Detection of burst signal transmissions 119 1988
 
CONIFER CORPORATION (1)
5,020,149 Integrated down converter and interdigital filter apparatus and method for construction thereof 122 1988
 
CRYSTAL SEMICONDUCTOR CORPORATION (1)
6,560,451 Square wave analog multiplier 58 1999
 
CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA (1)
5,483,695 Intermediate frequency FM receiver using analog oversampling to increase signal bandwidth 103 1994
 
CSR TECHNOLOGY INC. (1)
5,737,035 Highly integrated television tuner on a single microcircuit 289 1995
 
CTS CORPORATION (1)
5,513,389 Push pull buffer with noise cancelling symmetry 101 1995
 
DELCO ELECTRONICS CORPORATION (1)
5,339,395 Interface circuit for interfacing a peripheral device with a microprocessor operating in either a synchronous or an asynchronous mode 87 1992
 
DIASENSE, ICN. (1)
6,064,054 Synchronous detection for photoconductive detectors 100 1998
 
DREXEL UNIVERSITY (1)
5,465,418 Self-oscillating mixer circuits and methods therefor 102 1994
 
DRS SIGNAL SOLUTIONS, INC. (1)
6,144,236 Structure and method for super FET mixer having logic-gate generated FET square-wave switching signal 105 1998
 
E-SYSTEMS, INC. (1)
4,346,477 Phase locked sampling radio receiver 121 1977
 
EADS SECURE NETWORKS OY (1)
5,901,349 Mixer device with image frequency rejection 152 1996
 
EATON CORPORATION (1)
4,245,355 Microwave frequency converter 108 1979
 
EEV LIMITED (1)
5,463,357 Wide-band microwave modulator arrangements 104 1994
 
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
5,559,809 Transmit block up-converter for very small aperture terminal remote station 50 1995
 
ELPIDA MEMORY, INC. (1)
5,449,939 Semiconductor device having a protective transistor 39 1994
 
ERICSSON AB (1)
6,363,262 Communication device having a wideband receiver and operating method therefor 105 1998
 
ETAT FRANCAIS REPRESENTE PAR LE MINISTRE DELEGUE DES POSTES ET TELECOMMUNICATIONS (CENTRE NATIONAL D'ETUDES DES TELECOMMUNICATIONS) (1)
4,908,579 Switched capacitor sampling filter 103 1988
 
FLUKE CORPORATION (1)
4,965,467 Sampling system, pulse generation circuit and sampling circuit suitable for use in a sampling system, and oscilloscope equipped with a sampling system 103 1989
 
FOUNDATION FOR ADVANCEMENT OF INTERNATIONAL SCIENCE (1)
5,528,068 Semiconductor device 33 1994
 
FOVEON, INC. (1)
6,512,544 Storage pixel sensor and array with compression 117 1998
 
FRANCE TELECOM (1)
5,678,220 Device for rejection of the image signal of a signal converted to an intermediate frequency 97 1995
 
FUJITSU COMPOUND SEMICONDUCTOR, INC. (1)
5,903,827 Single balanced frequency downconverter for direct broadcast satellite transmissions and hybrid ring signal combiner 114 1995
 
FUJITSU SEMICONDUCTOR LIMITED (1)
5,896,347 Semiconductor memory system using a clock-synchronous semiconductor device and semiconductor memory device for use in the same 92 1997
 
FUNAI ELECTRIC CO., LTD. (1)
5,777,692 Receiver based methods and devices for combating co-channel NTSC interference in digital transmission 126 1996
 
FUTURE CAPITAL L.L.C. (1)
5,905,433 Trailer communications system 87 1996
 
GENERAL DYNAMICS C4 SYSTEMS, INC. (1)
6,085,073 Method and system for reducing the sampling rate of a signal for use in demodulating high modulation index frequency modulated signals 89 1998
 
GENERAL DYNAMICS DECISION SYSTEMS, INC. (1)
5,517,688 MMIC FET mixer and method 108 1994
 
GENERAL INSTRUMENT CORPORATION (1)
5,131,014 Apparatus and method for recovery of multiphase modulated data 68 1991
 
GLENAYRE ELECTRONICS, INC. (1)
5,557,642 Direct conversion receiver for multiple protocols 166 1994
 
GRUMMAN AEROSPACE CORPORATION (1)
5,083,050 Modified cascode mixer circuit 112 1990
 
GRUNDIG MULTIMEDIA B.V. (1)
5,493,721 Receiver for a digital radio signal 104 1993
 
GTE AUTOMATIC ELECTRIC INCORPORATED, A CORP. OF DE. (1)
4,446,438 Switched capacitor n-path filter 132 1981
 
HAMAMATSU PHOTONICS K.K. (1)
5,847,594 Solid-state image sensing device 71 1997
 
HER MAJESTY IN RIGHT OF CANADA AS REPRESENTED BY THE MINISTER OF COMMUNICATIONS (1)
4,384,357 Self-synchronization circuit for a FFSK or MSK demodulator 111 1981
 
HER MAJESTY THE QUEEN IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF NATIONAL DEFENCE (1)
4,866,441 Wide band, complex microwave waveform receiver and analyzer, using distributed sampling techniques 65 1986
 
HITACHI, LTD. (1)
4,769,612 Integrated switched-capacitor filter with improved frequency characteristics 109 1987
 
HONEYWELL INC. (1)
5,263,198 Resonant loop resistive FET mixer 70 1991
 
HP HOLDINGS THREE, INC. (1)
5,136,267 Tunable bandpass filter system and filtering method 120 1990
 
HRL LABORATORIES, LLC (1)
7,783,250 Method for up converting a transmitted signal and down converting a received signal 20 2007
 
HTC CORPORATION (1)
5,907,197 AC/DC portable power connecting architecture 121 1997
 
HUGHES NETWORK SYSTEMS, INC. (1)
4,250,458 Baseband DC offset detector and control circuit for DC coupled digital demodulator 101 1979
 
ICOM INCORPORATED (1)
5,555,453 Radio communication system 115 1995
 
IFR LIMITED (1)
5,781,600 Frequency synthesizer 41 1995
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (1)
5,736,895 Biquadratic switched-capacitor filter using single operational amplifier 125 1996
 
INTELLECTUAL VENTURES I LLC (1)
5,802,463 Apparatus and method for receiving a modulated radio frequency signal by converting the radio frequency signal to a very low intermediate frequency signal 164 1996
 
INTERMEC CORPORATION (1)
5,495,500 Homodyne radio architecture for direct sequence spread spectrum data reception 155 1994
 
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION (1)
4,577,157 Zero IF receiver AM/FM/PM demodulator using sampling techniques 112 1983
 
INTERSTATE ELECTRONICS CORPORATION (1)
5,640,424 Direct downconverter circuit for demodulator in digital data transmission system 123 1995
 
IPR LICENSING, INC. (1)
6,959,178 Tunable upconverter mixer with image rejection 80 2003
 
ITT AEROSPACE OPTICAL (1)
4,761,798 Baseband phase modulator apparatus employing digital techniques 95 1987
 
KABEN WIRELESS SILICON INC. (1)
6,829,311 Complex valued delta sigma phase locked loop demodulator 48 2000
 
KABUSHIKI KAISHA SUWA SEIKOSHA (1)
4,517,519 FSK Demodulator employing a switched capacitor filter and period counters 112 1981
 
KENWOOD CORPORATION (1)
5,062,122 Delay-locked loop circuit in spread spectrum receiver 84 1988
 
KOLLMORGEN ARTUS (1)
5,483,245 ILS signal analysis device and method 41 1993
 
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
6,892,062 Current-reuse bleeding mixer 73 2001
 
KOREA TELECOM (1)
6,091,289 Low pass filter 88 1998
 
KYOCERA CORPORATION (1)
5,901,187 Diversity reception device 110 1998
 
L-1 SECURE CREDENTIALING, INC. (FORMERLY KNOWN AS DIGIMARC CORPORATION) (1)
5,907,149 Identification card with delimited usage 177 1994
 
LANDIS & GYR BETRIEBS AG (1)
5,287,516 Demodulation process for binary data 102 1991
 
LEGERITY, INC. (1)
5,995,030 Apparatus and method for a combination D/A converter and FIR filter employing active current division from a single current source 95 1995
 
LEVEL ONE COMMUNICATIONS, INC. (1)
6,313,685 Offset cancelled integrator 90 2000
 
LEWIS SALES LLC (1)
6,038,265 Apparatus for amplifying a signal using digital pulse width modulators 62 1997
 
LICENTIA PATENT-VERWALTUNGS-GMBH (1)
5,179,731 Frequency conversion circuit 107 1990
 
LIYUE CAPITAL, LLC (1)
5,640,415 Bit error performance of a frequency hopping, radio communication system 111 1994
 
LOCKHEED MARTIN ELECTRONIC SYSTMES CANADA INC. (1)
5,563,550 Recovery of data from amplitude modulated signals with self-coherent demodulation 99 1995
 
LSI LOGIC CORPORATION (1)
6,591,310 Method of responding to I/O request and associated reply descriptor 163 2000
 
MARTIN MARIETTA CORPORATION (1)
5,440,311 Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler filtering 113 1993
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
6,212,369 Merged variable gain mixers 85 1998
 
MCEWAN TECHNOLOGIES, LLC (1)
5,986,600 Pulsed RF oscillator and radar motion sensor 84 1998
 
MEASUREMENT SPECIALTIES, INC. (1)
4,816,704 Frequency-to-voltage converter 100 1987
 
MENTOR GRAPHICS CORPORATION (1)
6,195,539 Method and apparatus for rejecting image signals in a receiver 39 1998
 
MICRONAS INTERMETALL GMBH (1)
6,215,830 Carrier control loop for a receiver of digitally transmitted signals 24 1998
 
MICROSOFT CORPORATION (1)
6,169,733 Multiple mode capable radio receiver device 106 1997
 
MINOLTA CAMERA KABUSHIKI KAISHA (1)
4,771,265 Double integration analog to digital converting device 48 1987
 
MOBILIAN (1)
7,193,965 Multi-wireless network configurable behavior 49 2000
 
MOBILIAN INC. (1)
6,894,988 Wireless apparatus having multiple coordinated transceivers for multiple wireless communication protocols 56 1999
 
MULTISPECTRAL SOLUTIONS, INC. (1)
6,690,741 Ultra wideband data transmission system and method 103 1999
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,465,415 Even order term mixer 109 1992
 
NEW JAPAN RADIO CO., LTD. (1)
5,982,810 Signal extraction circuit and correlator utilizing the circuit 39 1997
 
NIPPON ELECTRIC CO., LTD. (1)
4,355,401 Radio transmitter/receiver for digital and analog communications system 123 1980
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,633,510 Electronic circuit capable of stably keeping a frequency during presence of a burst 87 1984
 
NOKIA NETWORKS OY (1)
6,738,609 Receiver and method of receiving 42 2000
 
NORTHERN TELECOM LIMITED (1)
6,026,286 RF amplifier, RF mixer and RF receiver 201 1996
 
NORTHPOINT TECHNOLOGY, LTD. (1)
6,208,636 Apparatus and method for processing signals selected from multiple data streams 91 1998
 
NORTHROP GRUMMAN CORPORATION (1)
5,859,878 Common receive module for a programmable digital radio 171 1995
 
NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
6,054,889 Mixer with improved linear range 118 1997
 
NOSSWITZ, MANFRED (1)
5,911,116 Transmitting-receiving switch-over device complete with semiconductors 115 1997
 
NTT DATA COMMUNICATIONS SYSTEMS CORPORATION (1)
5,903,553 Enhanced signal collision detection method in wireless communication system 113 1996
 
NYNEX SCIENCE & TECHNOLOGY, INC. (1)
5,239,496 Digital parallel correlator 94 1989
 
OHM TECHNOLOGIES INTERNATIONAL, LLC (1)
6,047,026 Method and apparatus for automatic equalization of very high frequency multilevel and baseband codes using a high speed analog decision feedback equalizer 96 1997
 
OLYMPUS OPTICAL CO., LTD. (1)
6,628,328 Image pickup apparatus having a CPU driving function operable in two modes 83 1998
 
PACESETTER, INC. (1)
5,170,414 Adjustable output level signal transmitter 102 1989
 
PARKER VISION (1)
6,542,722 Method and system for frequency up-conversion with variety of transmitter configurations 97 1999
 
PHONE TEL COMMUNICATIONS, INC. (1)
4,740,675 Digital bar code slot reader with threshold comparison of the differentiated bar code signal 157 1986
 
PIONEER ELECTRONIC CORPORATION (1)
5,140,705 Center-tapped coil-based tank circuit for a balanced mixer circuit 113 1990
 
PIXEL INSTRUMENTS CORP. (1)
6,098,046 Frequency converter system 156 1998
 
PLESSEY SEMICONDUCTORS LIMITED (1)
4,810,976 Frequency doubling oscillator and mixer circuit 106 1987
 
PREMIERE RF (1)
5,952,895 Direct digital synthesis of precise, stable angle modulated RF signal 155 1998
 
REALTEK SEMICONDUCTOR CORP. (1)
6,999,747 Passive harmonic switch mixer 89 2003
 
RENESAS ELECTRONICS CORPORATION (1)
6,865,399 Mobile telephone apparatus 63 2002
 
RESEARCH IN MOTION LIMITED (1)
6,091,939 Mobile radio transmitter with normal and talk-around frequency bands 96 1997
 
RETRO REFLECTIVE OPTICS (1)
4,894,766 Power supply frequency converter 101 1988
 
RF MICRO DEVICES, INC. (1)
6,509,777 Method and apparatus for reducing DC offset 97 2001
 
RODGERS ORGAN COMPANY, A CORP. OF (1)
4,409,877 Electronic tone generating system 35 1981
 
ROKE MANOR RESEARCH LIMITED (1)
5,943,370 Direct conversion receiver 106 1997
 
ROUND ROCK RESEARCH, LLC (1)
4,885,587 Multibit decorrelated spur digital radio frequency memory 108 1988
 
RPX CORPORATION (1)
5,204,642 Frequency controlled recursive oscillator having sinusoidal output 103 1992
 
SAMSUNG ELECTRO-MECHANICS CO., LTD. (1)
5,959,850 Asymmetrical duty cycle flyback converter 99 1998
 
SANGAMO WESTON, INC. (1)
4,789,837 Switched capacitor mixer/multiplier 78 1987
 
SARNOFF CORPORATION (1)
5,920,199 Charge detector with long integration time 101 1997
 
SCHNEIDER ELECTRIC INDUSTRIES SAS (1)
5,994,689 Photoelectric cell with stabilised amplification 72 1997
 
SCIENTIFIC COMPONENTS (1)
6,917,796 Triple balanced mixer 67 2002
 
SEA COM CORPORATION (1)
5,222,250 Single sideband radio signal processing system 29 1992
 
SECRETARY OF STATE FOR DEFENCE, THE (1)
5,422,913 High frequency multichannel diversity differential phase shift (DPSK) communications system 122 1993
 
SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC (1)
4,648,021 Frequency doubler circuit and method 110 1986
 
SENSUS USA INC. (1)
5,438,329 Duplex bi-directional multi-mode remote instrument reading and telemetry system 364 1993
 
SEONG SANG INVESTMENTS LLC (1)
6,647,270 Vehicletalk 136 2000
 
SEQUENCE INCORPORATED (1)
4,833,445 Fiso sampling system 129 1985
 
SEXTANT AVIONIQUE (1)
6,081,691 Receiver for determining a position on the basis of satellite networks 113 1998
 
SGS MICROELETRONICA S.P.A. (1)
4,920,510 Sample data band-pass filter device 99 1987
 
SGS-THOMSON MICROELECTRONICS S.A. (1)
5,589,793 Voltage booster circuit of the charge-pump type with bootstrapped oscillator 125 1993
 
SHARP CORPORATION (1)
5,388,063 Filter circuit with switchable finite impulse response and infinite impulse response filter characteristics 119 1993
 
SIEMENS ENTERPRISE COMMUNICATIONS, INC. (1)
5,911,123 System and method for providing wireless connections for single-premises digital telephones 138 1996
 
SIGE SEMICONDUCTOR INC. (1)
6,850,742 Direct conversion receiver 74 2001
 
SILICON SYSTEMS, INC. (1)
5,006,854 Method and apparatus for converting A/D nonlinearities to random noise 56 1989
 
SOCIETE ANONYME DITE : ALCATEL ESPACE (1)
4,885,756 Method of demodulating digitally modulated signals, and apparatus implementing such a method 105 1988
 
SONY ERICSSON MOBILE COMMUNICATIONS JAPAN, INC. (1)
7,149,487 Mobile communication terminal device and variable gain circuit 34 2003
 
STANDARD TELEPHONES AND CABLES PUBLIC LIMITED COMPANY (1)
4,571,738 Demodulator logic for frequency shift keyed signals 36 1984
 
STMICROELECTRONICS N.V. (1)
5,703,584 Analog data acquisition system 80 1994
 
STMICROELECTRONICS S.A. (1)
6,882,194 Class AB differential mixer 64 2003
 
SWAYZE, W. DANIEL, JR. (1)
5,900,746 Ultra low jitter differential to fullswing BiCMOS comparator with equal rise/fall time and complementary outputs 51 1996
 
SYNERGY MICROWAVE CORPORATION (1)
5,416,449 Modulator with harmonic mixers 92 1994
 
SYSTRON DONNER CORPORATION (1)
5,345,239 High speed serrodyne digital frequency translator 84 1988
 
TAIT ELECTRONICS LIMITED (1)
5,715,281 Zero intermediate frequency receiver 137 1996
 
TAKEDA RIKEN CO., LTD. (1)
4,602,220 Variable frequency synthesizer with reduced phase noise 132 1985
 
TAKESHI IKEDA (1)
6,034,566 Tuning amplifier 61 1998
 
TALKING DATA LLC (1)
5,410,541 System for simultaneous analog and digital communications over an analog channel 200 1992
 
TALKPOINT COMMUNICATIONS, INC. (1)
5,786,844 Video modem for transmitting video data over ordinary telephone wires 116 1996
 
TELECOMMUNICATIONS RESEARCH LABORATORIES (1)
5,825,257 GMSK modulator formed of PLL to which continuous phase modulated signal is applied 106 1997
 
TELEDYNE SCIENTIFIC & IMAGING, LLC (1)
6,151,354 Multi-mode, multi-band, multi-user radio system architecture 131 1997
 
TELOGY NETWORKS, INC. (1)
4,972,436 High performance sigma delta based analog modem front end 132 1988
 
TERRA MARINE ENGINEERING, INC. (1)
4,663,744 Real time seismic telemetry system 59 1983
 
TEXAS INSTRUMENTS DEUTSCHLAND GMBH (1)
5,552,789 Integrated vehicle communications system 222 1994
 
TEXTRON DEFENSE SYSTEMS, DIVISION OF AVCO CORPORATION (1)
5,604,592 Laser ultrasonics-based material analysis system and method using matched filter processing 127 1995
 
THE B. F. GOODRICH COMPANY (1)
4,393,352 Sample-and-hold hybrid active RC filter 39 1980
 
THE FURUKAWA ELECTRIC CO., LTD. (1)
5,724,041 Spread spectrum radar device using pseudorandom noise signal for detection of an object 66 1995
 
THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY (1)
5,937,013 Subharmonic quadrature sampling receiver and design 104 1997
 
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (1)
5,369,404 Combined angle demodulator and digitizer 112 1993
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE (1)
5,691,629 Non-volatile power supply having energy efficient DC/DC voltage converters with a small storage capacitor 30 1995
 
THOMSON BROADCAST SYSTEMS (1)
5,903,187 Monolithically integrable frequency demodulator device 100 1996
 
THOMSON COMPOSANTS MICROODES (1)
5,122,765 Direct microwave modulation and demodulation device 104 1989
 
THOMSON COMPOSANTS MICROONDES (1)
5,017,924 Sample-and-hold unit with high sampling frequency 111 1990
 
TOKYO ELECTRIC CO., LTD. (1)
5,111,152 Apparatus and method for demodulating a digital modulation signal 105 1991
 
TRIMBLE NAVIGATION LIMITED (1)
5,650,785 Low power GPS receiver 133 1994
 
TRIO KABUSHIKI KAISHA (1)
4,517,520 Circuit for converting a staircase waveform into a smoothed analog signal 104 1982
 
TSUBOUCHI, KAZUO (1)
5,905,449 Radio switching apparatus 103 1997
 
UNDERSEA SENSOR SYSTEMS, INC. (1)
4,970,703 Switched capacitor waveform processing circuit 107 1984
 
UNIDEN AMERICA CORPORATION (1)
5,710,992 Chain search in a scanning receiver 90 1996
 
UNIDEN CORPORATION (1)
5,610,946 Radio communication apparatus 105 1995
 
UNISYS CORPORATION (1)
5,063,387 Doppler frequency compensation circuit 72 1989
 
UNITRODE CORPORATION (1)
5,663,878 Apparatus and method for generating a low frequency AC signal 102 1996
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 24 2007
 
USA DIGITAL RADIO, INC. (1)
5,005,169 Frequency division multiplex guardband communication system for sending information over the guardbands 207 1989
 
VERIZON LABORATORIES INC. (1)
5,016,242 Microwave subcarrier generation for fiber optic systems 122 1988
 
VIASAT, INC. (1)
5,454,009 Method and apparatus for providing energy dispersal using frequency diversity in a satellite communications system 125 1994
 
VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY (1)
4,931,716 Constant frequency zero-voltage-switching multi-resonant converter 140 1989
 
VIZADA, INC. (1)
5,375,146 Digital frequency conversion and tuning scheme for microwave radio receivers and transmitters 203 1993
 
VOICE SIGNALS LLC (1)
5,339,459 High speed sample and hold circuit and radio constructed therewith 118 1992
 
WESTINGHOUSE ELECTRIC CORP. (1)
5,151,661 Direct digital FM waveform generator for radar systems 109 1991
 
WJ COMMUNICATIONS, INC. (1)
5,678,226 Unbalanced FET mixer 98 1994
 
WOODLAND VENTURE FUND (1)
5,621,455 Video modem for transmitting video data over ordinary telephone wires 160 1994
 
Z124, C/O MAPLES CORPORATE SERVICES LIMITED (1)
5,642,071 Transit mixer with current mode input 106 1995
 
ZENITH ELECTRONICS CORPORATION (1)
4,380,828 UHF MOSFET Mixer 63 1981
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (14)
4,308,614 Noise-reduction sampling system 101 1978
4,320,536 Subharmonic pumped mixer circuit 119 1979
4,253,066 Synchronous detection with sampling 103 1980
4,456,990 Periodic wave elimination by negative feedback 100 1982
4,716,388 Multiple output allpass switched capacitor filters 105 1984
4,811,422 Reduction of undesired harmonic components 74 1986
5,010,585 Digital data and analog radio frequency transmitter 131 1990
5,047,860 Wireless audio and video signal transmitter and receiver system apparatus 51 1990
5,214,787 Multiple audio channel broadcast system 112 1990
5,239,687 Wireless intercom having a transceiver in which a bias current for the condenser microphone and the driving current for the speaker are used to charge a battery during transmission and reception, respectively 66 1991
5,307,517 Adaptive notch filter for FM interference cancellation 129 1991
5,915,278 System for the measurement of rotation and translation for modal analysis 99 1995
6,005,903 Digital correlator 105 1996
6,188,221 Method and apparatus for transmitting electromagnetic waves and analyzing returns to locate underground fluid deposits 52 1998

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (11)
8,295,406 Universal platform module for a plurality of communication protocols 2 2000
8,160,196 Networking methods and systems 6 2006
8,233,855 Up-conversion based on gated information signal 3 2009
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 3 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 2 2010
8,160,534 Applications of universal frequency translation 6 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 3 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 3 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 4 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 3 2011
8,190,108 Method and system for frequency up-conversion 4 2011
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,446,994 Gain control in a communication channel 0 2009

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