US Patent No: 7,539,474

Number of patents in Portfolio can not be more than 2000

DC offset, re-radiation, and I/Q solutions using universal frequency translation technology

1 Status Updates

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ALSO PUBLISHED AS: 20050143042
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PARKERVISION, INC.JACKSONVILLE, FL169

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bultman, Michael J Jacksonville, FL 142 4833
Cook, Robert W Switzerland, FL 140 4840
Jensen, Jonathan S Salt Lake City, UT 12 268
Johnson, Martin R Draper, UT 25 343
Looke, Richard C Jacksonville, FL 136 4839
Moses,, Jr Charley D - 58 567
Rawlins, Gregory S Heathrow, FL 189 3989
Rawlins, Michael W Lake Mary, FL 164 3873
Short, Robert T Salt Lake City, UT 38 1880
Sorrels, David F - 1 30
Young, Jamison L Woods Cross, UT 12 268

Cited Art

Patent Info (Count) # Cites Year
 
AKAMAI TECHNOLOGIES, INC. (92)
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PARKERVISION, INC. (64)
6,049,706 Integrated frequency translation and selectivity 124 1998
6,061,551 Method and system for down-converting electromagnetic signals 127 1998
6,061,555 Method and system for ensuring reception of a communications signal 111 1998
6,091,940 Method and system for frequency up-conversion 114 1998
6,370,371 Applications of universal frequency translation 107 1999
6,560,301 Integrated frequency translation and selectivity with a variety of filter embodiments 88 1999
6,580,902 Frequency translation using optimized switch structures 91 1999
6,687,493 Method and circuit for down-converting a signal using a complementary FET structure for improved dynamic range 91 1999
6,266,518 Method and system for down-converting electromagnetic signals by sampling and integrating over apertures 108 1999
6,421,534 Integrated frequency translation and selectivity 114 1999
6,647,250 Method and system for ensuring reception of a communications signal 95 1999
6,353,735 MDG method for output signal generation 98 1999
6,704,549 Multi-mode, multi-band communication system 97 2000
6,704,558 Image-reject down-converter and embodiments thereof, such as the family radio service 92 2000
7,006,805 Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service 65 2000
7,209,725 Analog zero if FM decoder and embodiments thereof, such as the family radio service 51 2000
6,634,555 Bar code scanner using universal frequency translation technology for up-conversion and down-conversion 85 2000
6,853,690 Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments 77 2000
6,879,817 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 72 2000
7,110,435 Spread spectrum applications of universal frequency translation 66 2000
6,798,351 Automated meter reader applications of universal frequency translation 80 2000
7,039,372 Method and system for frequency up-conversion with modulation embodiments 65 2000
7,065,162 Method and system for down-converting an electromagnetic signal, and transforms for same 71 2000
7,295,826 Integrated frequency translation and selectivity with gain control functionality, and applications thereof 49 2000
6,694,128 Frequency synthesizer using universal frequency translation technology 89 2000
6,873,836 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 80 2000
7,027,786 Carrier and clock recovery using universal frequency translation 60 2000
7,321,735 Optical down-converter using universal frequency translation technology 43 2000
7,082,171 Phase shifting applications of universal frequency translation 64 2000
7,054,296 Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation 158 2000
7,072,390 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 63 2000
7,110,444 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 65 2000
7,292,835 Wireless and wired cable modem applications of universal frequency translation technology 48 2001
7,379,515 Phased array antenna applications of universal frequency translation 45 2001
6,813,485 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 97 2001
7,010,286 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 69 2001
7,085,335 Method and apparatus for reducing DC offsets in a communication system 63 2001
7,010,559 Method and apparatus for a parallel correlator and applications thereof 71 2001
7,016,663 Applications of universal frequency translation 61 2002
7,236,754 Method and system for frequency up-conversion 53 2002
7,379,883 Networking methods and systems 41 2002
7,460,584 Networking methods and systems 31 2002
7,072,427 Method and apparatus for reducing DC offsets in a communication system 77 2002
6,975,848 Method and apparatus for DC offset removal in a radio frequency communication channel 64 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 44 2002
7,272,164 Reducing DC offsets using spectral spreading 48 2002
6,963,734 Differential frequency down-conversion using techniques of universal frequency translation technology 70 2002
7,190,941 Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology 51 2002
7,224,749 Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology 50 2002
6,836,650 Methods and systems for down-converting electromagnetic signals, and applications thereof 81 2002
7,076,011 Integrated frequency translation and selectivity 59 2003
7,389,100 Method and circuit for down-converting a signal 40 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 42 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 32 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 44 2004
7,107,028 Apparatus, system, and method for up converting electromagnetic signals 58 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 53 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 42 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 51 2004
7,245,886 Method and system for frequency up-conversion with modulation embodiments 49 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 86 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 35 2005
7,218,907 Method and circuit for down-converting a signal 51 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 40 2006
 
MOTOROLA, INC. (24)
4,369,522 Singly-balanced active mixer circuit 100 1979
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4,562,414 Digital frequency modulation system and method 68 1983
4,596,046 Split loop AFC system for a SSB receiver 46 1984
4,785,463 Digital global positioning system receiver 423 1985
4,675,882 FM demodulator 141 1985
4,653,117 Dual conversion FM receiver using phase locked direct conversion IF 170 1985
4,733,403 Digital zero IF selectivity section 122 1986
4,893,316 Digital radio frequency receiver 306 1986
4,737,969 Spectrally efficient digital modulation method and apparatus 115 1987
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4,857,928 Method and arrangement for a sigma delta converter for bandpass signals 142 1988
4,910,752 Low power digital receiver 141 1988
5,220,583 Digital FM demodulator with a reduced sampling rate 123 1988
4,931,921 Wide bandwidth frequency doubler 106 1989
5,003,621 Direct conversion FM receiver 165 1989
5,212,827 Zero intermediate frequency noise blanker 134 1991
5,444,865 Generating transmit injection from receiver first and second injections 111 1991
5,410,743 Active image separation mixer 115 1993
5,422,909 Method and apparatus for multi-phase component downconversion 129 1993
5,410,270 Differential amplifier circuit having offset cancellation and method therefor 139 1994
5,465,410 Method and apparatus for automatic frequency and bandwidth control 135 1994
5,519,890 Method of selectively reducing spectral components in a wideband radio frequency signal 117 1995
5,699,006 DC blocking apparatus and technique for sampled data filters 104 1996
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (18)
4,591,736 Pulse signal amplitude storage-holding apparatus 107 1982
4,868,654 Sub-nyquist sampling encoder and decoder of a video system 120 1988
5,361,408 Direct conversion receiver especially suitable for frequency shift keying (FSK) modulated signals 109 1991
5,319,799 Signal oscillation method for time-division duplex radio transceiver and apparatus using the same 127 1992
5,369,789 Burst signal transmitter 127 1994
5,617,451 Direct-conversion receiver for digital-modulation signal with signal strength detection 111 1994
5,757,870 Spread spectrum communication synchronizing method and its circuit 99 1995
5,600,680 High frequency receiving apparatus 93 1995
5,640,428 Direct conversion receiver 110 1995
5,760,629 DC offset compensation device 90 1996
5,818,869 Spread spectrum communication synchronizing method and its circuit 98 1997
6,067,329 VSB demodulator 99 1997
5,903,178 Semiconductor integrated circuit 121 1997
5,945,660 Communication system for wireless bar code reader 149 1997
6,275,542 Direct conversion receiver including mixer down-converting incoming signal, and demodulator operating on downconverted signal 54 1998
6,178,319 Microwave mixing circuit and down-converter 84 1998
6,600,795 Receiving circuit 86 1999
6,313,700 Power amplifier and communication unit 64 2000
 
U.S. Philips Corporation (14)
4,405,835 Receiver for AM stereo signals having a circuit for reducing distortion due to overmodulation 39 1981
4,488,119 FM Demodulator 89 1982
4,518,935 Band-rejection filter of the switched capacitor type 105 1983
4,743,858 R. F. power amplifier 152 1986
4,768,187 Signal transmission system and a transmitter and a receiver for use in the system 130 1986
4,890,302 Circuit for extracting carrier signals 105 1987
4,845,389 Very high frequency mixer 78 1988
5,113,129 Apparatus for processing sample analog electrical signals 112 1989
5,241,561 Radio receiver 135 1991
5,159,710 Zero IF receiver employing, in quadrature related signal paths, amplifiers having substantially sinh.sup.-1 transfer characteristics 111 1991
5,619,538 Pulse shaping FM demodular with low noise where capacitor charge starts on input signal edge 102 1995
5,903,609 Transmission system using transmitter with phase modulator and frequency multiplier 112 1996
5,793,817 DC offset reduction in a transmitter 108 1996
6,112,061 Radio communication device 52 1998
 
MOTOROLA MOBILITY LLC (12)
5,423,082 Method for a transmitter to compensate for varying loading without an isolator 124 1993
5,579,341 Multi-channel digital transceiver and method 139 1994
5,668,836 Split frequency band signal digitizer and method 125 1994
5,748,683 Multi-channel transceiver having an adaptive antenna array and method 122 1995
5,710,998 Method and apparatus for improved zero intermediate frequency receiver latency 114 1995
5,705,955 Frequency locked-loop using a microcontroller as a comparator 133 1995
5,901,347 Fast automatic gain control circuit and method for zero intermediate frequency receivers and radiotelephone using same 122 1996
5,689,413 Voltage convertor for a portable electronic device 112 1996
5,901,344 Method and apparatus for improved zero intermediate frequency receiver latency 104 1997
5,949,827 Continuous integration digital demodulator for use in a communication device 91 1997
6,321,073 Radiotelephone receiver and method with improved dynamic range and DC offset correction 119 2000
6,625,470 Transmitter 52 2000
 
LUCENT TECHNOLOGIES INC. (11)
5,724,653 Radio receiver with DC offset correction circuit 186 1994
5,745,846 Channelized apparatus for equalizing carrier powers of multicarrier signal 123 1995
5,602,847 Segregated spectrum RF downconverter for digitization systems 121 1995
5,767,726 Four terminal RF mixer device 111 1996
6,298,065 Method for multi-mode operation of a subscriber line card in a telecommunications system 71 1997
6,078,630 Phase-based receiver with multiple sampling frequencies 88 1998
6,167,247 Local oscillator leak cancellation circuit 42 1998
6,198,941 Method of operating a portable communication device 118 1998
6,618,579 Tunable filter with bypass 103 1999
6,437,639 Programmable RC filter 92 2000
2002/0132,642 Common module combiner/active array multicarrier approach without linearization loops 58 2001
 
NEC CORPORATION (11)
4,806,790 Sample-and-hold circuit 118 1988
4,841,265 Surface acoustic wave filter 96 1988
5,091,921 Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency 114 1990
5,260,973 Device operable with an excellent spectrum suppression 86 1991
5,196,806 Output level control circuit for use in RF power amplifier 119 1991
5,410,195 Ripple-free phase detector using two sample-and-hold circuits 72 1992
5,353,306 Tap-weight controller for adaptive matched filter receiver 123 1992
5,379,040 Digital-to-analog converter 104 1993
5,339,054 Modulated signal transmission system compensated for nonlinear and linear distortion 123 1993
5,784,689 Output control circuit for transmission power amplifying circuit 128 1995
6,175,728 Direct conversion receiver capable of canceling DC offset voltages 132 1998
 
QUALCOMM INCORPORATED (11)
5,446,422 Dual mode FM and DQPSK modulator 123 1994
5,757,858 Dual-mode digital FM communication system 171 1997
5,896,562 Transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands 187 1997
5,982,315 Multi-loop .SIGMA. .DELTA. analog to digital converter 142 1997
6,005,506 Receiver with sigma-delta analog-to-digital converter for sampling a received signal 128 1997
6,137,321 Linear sampling switch 40 1999
6,088,348 Configurable single and dual VCOs for dual- and tri-band wireless communication systems 69 1999
6,366,622 Apparatus and method for wireless communications 293 1999
6,973,476 System and method for communicating data via a wireless high speed link 72 2000
6,731,146 Method and apparatus for reducing PLL lock time 53 2000
6,909,739 Signal acquisition system for spread spectrum receiver 65 2000
 
ROCKWELL INTERNATIONAL CORPORATION (11)
4,241,451 Single sideband signal demodulator 93 1978
4,253,067 Baseband differentially phase encoded radio signal detector 123 1978
4,363,976 Subinterval sampler 50 1981
4,463,320 Automatic gain control circuit 38 1982
4,484,143 CCD Demodulator circuit 94 1982
4,772,853 Digital delay FM demodulator with filtered noise dither 89 1987
4,814,649 Dual gate FET mixing apparatus with feedback means 75 1987
5,095,533 Automatic gain control system for a direct conversion receiver 119 1990
5,095,536 Direct conversion receiver with tri-phase architecture 138 1990
5,249,203 Phase and gain error control system for use in an I/Q direct conversion receiver 156 1991
5,564,097 Spread intermediate frequency radio receiver with adaptive spurious rejection 103 1994
 
SONY CORPORATION (10)
4,220,977 Signal transmission circuit 94 1978
4,439,787 AFT Circuit 64 1982
4,612,464 High speed buffer circuit particularly suited for use in sample and hold circuits 107 1984
5,172,070 Apparatus for digitally demodulating a narrow band modulated signal 110 1991
5,608,531 Video signal recording apparatus 104 1994
6,097,762 Communication system 42 1995
5,633,610 Monolithic microwave integrated circuit apparatus 66 1995
5,903,854 High-frequency amplifier, transmitting device and receiving device 182 1996
6,801,253 Solid-state image sensor and method of driving same 91 1998
6,910,015 Sales activity management system, sales activity management apparatus, and sales activity management method 60 2001
 
MOTOROLA SOLUTIONS, INC. (9)
5,389,839 Integratable DC blocking circuit 95 1993
5,483,691 Zero intermediate frequency receiver having an automatic gain control circuit 146 1994
5,801,654 Apparatus and method for frequency translation in a communication device 108 1995
5,602,868 Multiple-modulation communication system 159 1995
5,898,912 Direct current (DC) offset compensation method and apparatus 127 1996
5,903,196 Self centering frequency multiplier 106 1997
6,121,819 Switching down conversion mixer for use in multi-stage receiver architectures 103 1998
5,973,570 Band centering frequency multiplier 41 1998
6,225,848 Method and apparatus for settling and maintaining a DC offset 107 2000
 
FREESCALE SEMICONDUCTOR, INC. (8)
5,263,196 Method and apparatus for compensation of imbalance in zero-if downconverters 131 1990
5,551,076 Circuit and method of series biasing a single-ended mixer 63 1994
6,160,280 Field effect transistor 92 1996
5,787,125 Apparatus for deriving in-phase and quadrature-phase baseband signals from a communication signal 88 1996
5,729,577 Signal processor with improved efficiency 134 1996
5,870,670 Integrated image reject mixer 133 1996
5,892,380 Method for shaping a pulse width and circuit therefor 114 1997
6,144,846 Frequency translation circuit and method of translating 113 1997
 
MITSUBISHI DENKI KABUSHIKI KAISHA (8)
4,485,347 Digital FSK demodulator 66 1981
4,651,034 Analog input circuit with combination sample and hold and filter 112 1984
5,251,232 Radio communication apparatus 186 1991
5,751,154 capacitive sensor interface circuit 109 1996
5,903,595 Digital matched filter 124 1997
6,259,293 Delay circuitry, clock generating circuitry, and phase synchronization circuitry 93 1999
6,600,911 Even harmonic direct-conversion receiver, and a transmitting and receiving apparatus using the same 94 2000
6,876,846 High frequency module 44 2001
 
FUJITSU LIMITED (7)
4,870,659 FSK demodulation circuit 107 1988
5,760,632 Double-balanced mixer circuit 92 1996
6,011,435 Transmission-line loss equalizing circuit 95 1997
5,914,622 Pulse-width controller 108 1997
5,834,979 Automatic frequency control apparatus for stabilization of voltage-controlled oscillator 89 1997
5,844,449 Gilbert cell phase modulator having two outputs combined in a balun 107 1997
6,091,941 Radio apparatus 139 1998
 
INTEL CORPORATION (7)
5,412,352 Modulator having direct digital synthesis for broadband RF transmission 153 1994
5,648,985 Universal radio architecture for low-tier personal communication system 113 1994
5,790,587 Multi-band, multi-mode spread-spectrum communication system 121 1995
6,072,996 Dual band radio receiver 55 1997
6,150,890 Dual band transmitter for a cellular phone comprising a PLL 115 1998
6,516,185 Automatic gain control and offset correction 130 2000
2004/0125,879 Information transmission unit 60 2002
 
KABUSHIKI KAISHA TOSHIBA (7)
4,734,591 Frequency doubler 110 1986
5,124,592 Active filter 103 1991
5,742,189 Frequency conversion circuit and radio communication apparatus with the same 140 1995
5,634,207 Frequency converter capable of reducing noise components in local oscillation signals 83 1996
6,204,789 Variable resistor circuit and a digital-to-analog converter 95 2000
7,197,081 System and method for receiving OFDM signal 40 2001
6,690,232 Variable gain amplifier 116 2002
 
SIEMENS AKTIENGESELLSCHAFT (7)
4,253,069 Filter circuit having a biquadratic transfer function 100 1979
4,430,629 Electrical filter circuit operated with a definite sampling and clock frequency f.sub.T which consists of CTD elements 101 1981
4,628,517 Digital radio system 132 1985
4,726,041 Digital filter switch for data receiver 106 1986
5,115,409 Multiple-input four-quadrant multiplier 125 1989
5,020,154 Transmission link 104 1990
5,014,130 Signal level control circuit having alternately switched capacitors in the feedback branch 69 1990
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (7)
RE37138 Log-polar signal processing 56 1993
5,628,055 Modular radio communications system 315 1994
5,579,347 Digitally compensated direct conversion receiver 130 1994
5,793,801 Frequency domain signal reconstruction compensating for phase adjustments to a sampling signal 134 1996
6,385,439 Linear RF power amplifier with optically activated switches 123 1997
6,400,963 Harmonic suppression in dual band mobile phones 106 1999
6,892,057 Method and apparatus for reducing dynamic range of a power amplifier 61 2002
 
TEXAS INSTRUMENTS INCORPORATED (7)
4,481,642 Integrated circuit FSK modem 110 1981
4,862,121 Switched capacitor filter 114 1987
5,444,415 Modulation and demodulation of plural channels using analog and digital components 122 1994
6,031,217 Apparatus and method for active integrator optical sensors 98 1998
6,144,331 Analog to digital converter with a differential output resistor-digital-to-analog-converter for improved noise reduction 112 1998
6,445,726 Direct conversion radio receiver using combined down-converting and energy spreading mixing signal 72 1999
7,358,801 Reducing noise and/or power consumption in a switched capacitor amplifier sampling a reference voltage 34 2005
 
Bell Telephone Laboratories, Incorporated (6)
4,360,867 Broadband frequency multiplication by multitransition operation of step recovery diode 106 1980
4,441,080 Amplifier with controlled gain 138 1981
4,479,226 Frequency-hopped single sideband mobile radio system 209 1982
4,612,518 QPSK modulator or demodulator using subharmonic pump carrier signals 108 1985
4,873,492 Amplifier with modulated resistor gain control 129 1988
5,012,245 Integral switched capacitor FIR filter/digital-to-analog converter for sigma-delta encoded digital audio 125 1989
 
RAYTHEON COMPANY (6)
4,616,191 Multifrequency microwave source 103 1983
4,634,998 Fast phase-lock frequency synthesizer with variable sampling efficiency 111 1985
4,810,904 Sample-and-hold phase detector circuit 107 1988
4,955,079 Waveguide excited enhancement and inherent rejection of interference in a subharmonic mixer 118 1989
5,884,154 Low noise mixer circuit having passive inductor elements 87 1996
6,147,340 Focal plane readout unit cell background suppression circuit and method 106 1998
 
SKYWORKS SOLUTIONS, INC. (6)
5,523,719 Component insensitive, analog bandpass filter 104 1994
5,778,022 Extended time tracking and peak energy in-window demodulation for use in a direct sequence spread spectrum system 117 1995
6,125,271 Front end filter circuitry for a dual band GSM/DCS cellular phone 106 1998
6,057,714 Double balance differential active ring mixer with current shared active input balun 129 1998
6,404,823 Envelope feedforward technique with power control for efficient linear RF power amplification 156 1998
6,307,894 Power amplification using a direct-upconverting quadrature mixer topology 139 1999
 
Thomson-CSF (6)
4,365,217 Charge-transfer switched-capacity filter 101 1980
4,392,255 Compact subharmonic mixer for EHF wave receiver using a single wave guide and receiver utilizing such a mixer 105 1981
4,363,132 Diversity radio transmission system having a simple and economical structure 104 1981
4,485,488 Microwave subharmonic mixer device 120 1982
4,688,237 Device for generating a fractional frequency of a reference frequency 45 1984
4,967,160 Frequency multiplier with programmable order of multiplication 127 1989
 
UNWIRED PLANET, LLC (6)
5,680,418 Removing low frequency interference in a digital FM receiver 111 1994
5,834,985 Digital continuous phase modulation for a DDS-driven phase locked loop 118 1996
6,215,828 Signal transformation method and apparatus 97 1997
6,611,569 Down/up-conversion apparatus and method 89 1998
6,567,483 Matched filter using time-multiplexed precombinations 66 1999
6,546,061 Signal transformation method and apparatus 37 2001
 
APPLE INC. (5)
5,471,665 Differential DC offset compensation circuit 169 1994
5,606,731 Zerox-IF receiver with tracking second local oscillator and demodulator phase locked loop oscillator 107 1995
5,918,167 Quadrature downconverter local oscillator leakage canceller 81 1997
6,094,084 Narrowband LC folded cascode structure 113 1998
6,327,313 Method and apparatus for DC offset correction 104 1999
 
CANON KABUSHIKI KAISHA (5)
5,267,023 Signal processing device 104 1991
5,465,071 Information signal processing apparatus 103 1995
5,771,442 Dual mode transmitter 116 1995
5,844,868 Digital-analog shared circuit in dual mode radio equipment 101 1997
6,459,721 Spread spectrum receiving apparatus 87 1998
 
NOKIA MOBILE PHONES LTD. (5)
5,697,074 Dual rate power control loop for a transmitter 156 1995
5,734,683 Demodulation of an intermediate frequency signal by a sigma-delta converter 80 1996
6,073,001 Down conversion mixer 97 1998
6,317,589 Radio receiver and method of operation 101 1998
6,438,366 Method and circuit for sampling a signal at high sampling frequency 72 1999
 
RCA Corporation (5)
4,204,171 Filter which tracks changing frequency of input signal 103 1978
4,286,283 Transcoder 72 1979
4,483,017 Pattern recognition system using switched capacitors 94 1981
4,393,395 Balanced modulator with feedback stabilization of carrier balance 99 1981
4,651,210 Adjustable gamma controller 49 1984
 
SYMBOL TECHNOLOGIES, INC. (5)
5,157,687 Packet data communication network 287 1990
5,809,060 High-data-rate wireless local-area network 187 1994
6,215,475 Highly integrated portable electronic work slate unit 108 1995
6,330,244 System for digital radio communication between a wireless lan and a PBX 283 1998
6,098,886 Glove-mounted system for reading bar code symbols 105 1998
 
The United States of America as represented by the Secretary of the Navy (5)
6,531,979 Adaptive time-compression stabilizer 86 1970
4,660,164 Multiplexed digital correlator 209 1983
5,535,402 System for (N.cndot.M)-bit correlation using N M-bit correlators 62 1992
5,663,986 Apparatus and method of transmitting data over a coaxial cable in a noisy environment 107 1996
5,883,548 Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier 98 1997
 
WI-LAN INC. (5)
5,282,222 Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum 411 1992
5,428,638 Method and apparatus for reducing power consumption in digital communications devices 112 1993
5,732,333 Linear transmitter using predistortion 228 1996
6,018,553 Multi-level mixer architecture for direct conversion of FSK signals 109 1996
5,881,375 Paging transmitter having broadband exciter using an intermediate frequency above the transmit frequency 101 1997
 
ERICSSON INC. (4)
5,909,460 Efficient apparatus for simultaneous modulation and digital beamforming for an antenna array 136 1995
5,894,496 Method and apparatus for detecting and compensating for undesired phase shift in a radio transceiver 150 1996
5,834,987 Frequency synthesizer systems and methods for three-point modulation with a DC response 136 1997
6,404,758 System and method for achieving slot synchronization in a wideband CDMA system in the presence of large initial frequency errors 70 1999
 
GENERAL ELECTRIC COMPANY (4)
4,902,979 Homodyne down-converter with digital Hilbert transform filtering 122 1989
4,982,353 Subsampling time-domain digital filter using sparsely clocked output latch 123 1989
5,896,304 Low power parallel correlator for measuring correlation between digital signal segments 129 1997
6,028,887 Power efficient receiver 134 1997
 
IBIQUITY DIGITAL CORPORATION (4)
5,278,826 Method and apparatus for digital audio broadcasting and reception 152 1991
5,315,583 Method and apparatus for digital audio broadcasting and reception 186 1991
5,523,726 Digital quadriphase-shift keying modulator 107 1994
5,768,323 Symbol synchronizer using modified early/punctual/late gate technique 119 1994
 
LOCKHEED MARTIN CORPORATION (4)
4,356,558 Optimum second order digital filter 121 1979
4,885,671 Pulse-by-pulse current mode controlled power supply 66 1988
4,896,152 Telemetry system with a sending station using recursive filter for bandwidth limiting 107 1989
4,888,557 Digital subharmonic sampling down-converter 135 1989
 
MITEL SEMICONDUCTOR LIMITED (4)
5,303,417 Mixer for direct conversion receiver 154 1991
5,451,899 Direct conversion FSK receiver using frequency tracking filters 109 1994
6,211,718 Low voltage double balanced mixer 80 1998
6,308,058 Image reject mixer 100 1998
 
MURATA MANUFACTURING CO., LTD. (4)
5,694,096 Surface acoustic wave filter 111 1996
5,770,985 Surface acoustic wave filter 102 1996
5,680,078 Mixer 106 1996
5,903,421 High-frequency composite part 111 1997
 
RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE (4)
4,334,324 Complementary symmetry FET frequency converter circuits 101 1980
4,603,300 Frequency modulation detector using digital signal vector processing 108 1984
4,745,463 Generalized chrominance signal demodulator for a sampled data television signal processing system 110 1986
4,819,252 Sampled data subsampling apparatus 109 1988
 
SAMSUNG ELECTRONICS CO., LTD. (4)
5,321,852 Circuit and method for converting a radio frequency signal into a baseband signal 134 1991
5,604,732 Up-link access apparatus in direct sequence code division multiple access system 126 1994
5,659,372 Digital TV detector responding to final-IF signal with vestigial sideband below full sideband in frequency 45 1995
5,825,254 Frequency converter for outputting a stable frequency by feedback via a phase locked loop 125 1997
 
SCIENTIFIC-ATLANTA, INC. (4)
5,191,459 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 141 1989
5,230,097 Offset frequency converter for phase/amplitude data measurement receivers 113 1990
5,379,141 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 111 1992
5,500,758 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 113 1994
 
TEKTRONIX, INC. (4)
4,621,217 Anti-aliasing filter circuit for oscilloscopes 113 1984
4,751,468 Tracking sample and hold phase detector 106 1986
4,757,538 Separation of L+R from L-R in BTSC system 110 1986
4,688,253 L+R separation system 104 1986
 
ALCATEL TELSPACE (3)
5,490,176 Detecting false-locking and coherent digital demodulation using the same 95 1992
5,416,803 Process for digital transmission and direct conversion receiver 126 1993
5,760,645 Demodulator stage for direct demodulation of a phase quadrature modulated signal and receiver including a demodulator stage of this kind 104 1996
 
Echelon Corporation (3)
5,239,686 Transceiver with rapid mode switching capability 141 1991
5,404,127 Power line communication while avoiding determinable interference harmonics 155 1993
5,355,114 Reconstruction of signals using redundant channels 168 1994
 
GOOGLE INC. (3)
6,041,073 Multi-clock matched filter for receiving signals with multipath 100 1998
6,823,178 High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation 75 2001
6,741,139 Optical to microwave converter using direct modulation phase shift keying 73 2002
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (3)
5,428,640 Switch circuit for setting and signaling a voltage level 102 1992
5,705,949 Compensation method for I/Q channel imbalance errors 146 1996
5,768,118 Reciprocating converter 126 1996
 
HITACHI AMERICA, LTD. (3)
5,282,023 Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters 156 1992
5,400,084 Method and apparatus for NTSC signal interference cancellation using recursive digital notch filters 152 1993
5,325,204 Narrowband interference cancellation through the use of digital recursive notch filters 138 1993
 
Hitachi Denshi Kabushiki Kaisha (3)
5,512,946 Digital video signal processing device and TV camera device arranged to use it 41 1995
5,926,065 Digital modulator having a digital filter including low-speed circuit components 99 1997
6,512,798 Digital communication system of orthogonal modulation type 42 1999
 
HUGHES ELECTRONICS CORPORATION (3)
4,995,055 Time shared very small aperture satellite terminals 143 1988
5,390,215 Multi-processor demodulator for digital cellular base station employing partitioned demodulation procedure with pipelined execution 80 1992
5,495,202 High spectral purity digital waveform synthesizer 116 1993
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (3)
5,894,239 Single shot with pulse width controlled by reference oscillator 105 1997
5,872,446 Low voltage CMOS analog multiplier with extended input dynamic range 109 1997
6,128,746 Continuously powered mainstore for large memory subsystems 98 1997
 
INTERSIL CORPORATION (3)
5,493,581 Digital down converter and method 115 1992
5,633,815 Formatter 92 1995
5,841,324 Charge-based frequency locked loop and method 96 1996
 
ITT MANUFACTURING ENTERPRISES, INC. (3)
5,126,682 Demodulation method and apparatus incorporating charge coupled devices 112 1991
5,483,549 Receiver having for charge-coupled-device based receiver signal processing 204 1994
5,557,641 Charge-coupled-device based transmitters and receivers 105 1994
 
LAWRENCE LIVERMORE NATIONAL SECURITY, LLC (3)
5,471,162 High speed transient sampler 143 1992
5,479,120 High speed sampler and demultiplexer 142 1994
5,523,760 Ultra-wideband receiver 207 1994
 
M&FC HOLDING, LLC (3)
RE35829 Binary phase shift keying modulation system and/or frequency multiplier 139 1995
5,999,561 Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset 202 1997
6,639,939 Direct sequence spread spectrum method computer-based product apparatus and system tolerant to frequency reference offset 143 1999
 
PROTOCOL-IP.COM, L.L.C. (3)
4,944,025 Direct conversion FM receiver with offset 183 1988
4,893,341 Digital receiver operating at sub-nyquist sampling rate 109 1989
5,263,194 Zero if radio receiver for intermittent operation 134 1990
 
SHARP KABUSHIKI KAISHA (3)
5,444,416 Digital FM demodulation apparatus demodulating sampled digital FM modulated wave 102 1994
5,960,033 Matched filter 108 1997
6,775,684 Digital matched filter 58 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 652 1993
5,640,698 Radio frequency signal reception using frequency shifting by discrete-time sub-sampling down-conversion 196 1995
6,963,626 Noise-reducing arrangement and method for signal processing 81 1999
 
VICTOR COMPANY OF JAPAN, LTD. (3)
4,472,785 Sampling frequency converter 145 1981
4,984,077 Signal converting apparatus 121 1989
5,539,770 Spread spectrum modulating apparatus using either PSK or FSK primary modulation 108 1994
 
VISTEON GLOBAL TECHNOLOGIES, INC. (3)
5,222,144 Digital quadrature radio receiver with two-step processing 146 1991
5,490,173 Multi-stage digital RF translator 113 1993
5,483,193 Circuit for demodulating FSK signals 107 1995
 
YAMAHA CORPORATION (3)
4,801,823 Sample hold circuit 103 1987
5,499,267 Spread spectrum communication system 107 1993
6,018,262 CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter 93 1998
 
ALCATEL N.V. (2)
4,718,113 Zero-IF receiver wih feedback loop for suppressing interfering signals 123 1986
5,933,467 Multirate receive device and method using a single adaptive interpolation filter 110 1996
 
AT&T CORP. (2)
5,481,570 Block radio and adaptive arrays for wireless systems 164 1993
5,515,014 Interface between SAW filter and Gilbert cell mixer 128 1994
 
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY (2)
5,065,409 FSK discriminator 103 1989
5,777,771 Generation of optical signals with RF components 119 1996
 
CDC PROPRIETE INTELLECTUELLE (2)
6,230,000 Product detector and method therefor 100 1998
6,441,694 Method and apparatus for generating digitally modulated signals 62 2000
 
CIRRUS LOGIC, INC. (2)
6,084,465 Method for time constant tuning of gm-C filters 100 1998
6,597,240 Circuits and methods for slew rate control and current limiting in switch-mode systems 67 2001
 
DAITA FRONTIER FUND, LLC (2)
6,084,922 Waiting circuit 97 1998
6,512,785 Matched filter bank 61 1999
 
EASTMAN KODAK COMPANY (2)
4,591,930 Signal processing for high resolution electronic still camera 71 1983
4,791,584 Sub-nyquist interferometry 127 1986
 
EFRATOM TIME AND FREQUENCY PRODUCTS, INC. (2)
5,714,910 Methods and apparatus for digital frequency generation in atomic frequency standards 102 1994
5,721,514 Digital frequency generation in atomic frequency standards using digital phase shifting 109 1996
 
EXELIS INC. (2)
5,729,829 Interference mitigation method and apparatus for multiple collocated transceivers 116 1996
5,901,348 Apparatus for enhancing sensitivity in compressive receivers and method for the same 101 1997
 
GTE Lenkurt Incorporated (2)
4,504,803 Switched capacitor AM modulator/demodulator 105 1982
4,510,467 Switched capacitor DSB modulator/demodulator 88 1982
 
HARRIS CORPORATION (2)
5,390,364 Least-mean squares adaptive digital filter havings variable size loop bandwidth 126 1992
5,337,014 Phase noise measurements utilizing a frequency down conversion/multiplier, direct spectrum measurement technique 156 1992
 
Hughes Aircraft Company (2)
4,470,145 Single sideband quadricorrelator 115 1982
4,740,792 Vehicle location system 285 1986
 
INFINEON TECHNOLOGIES AG (2)
5,953,642 System for contactless power and data transmission 103 1997
6,633,194 Mixer 77 2001
 
INTELLECTUAL VENTURES II LLC (2)
5,661,424 Frequency hopping synthesizer using dual gate amplifiers 112 1993
6,246,695 Variable rate and variable mode transmission system 113 1998
 
KABUSHIKI KAISHA KENWOOD (2)
4,871,987 FSK or am modulator with digital waveform shaping 106 1988
4,855,894 Frequency converting apparatus 100 1988
 
KONINKLIJKE PHILIPS ELECTRONICS N.V. (2)
6,393,070 Digital communication device and a mixer 73 1998
2003/0149,579 Method of increasing functionality of a product 59 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 130 1998
6,686,879 Method and apparatus for transmitting and receiving signals having a carrier interferometry architecture 116 2001
 
Marconi Instruments Limited (2)
4,320,361 Amplitude and frequency modulators using a switchable component controlled by data signals 110 1979
4,914,405 Frequency synthesizer 102 1988
 
MARTINEZ,MICHAEL G. (2)
5,434,546 Circuit for simultaneous amplitude modulation of a number of signals 103 1993
5,463,356 FM band multiple signal modulator 105 1994
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (2)
5,841,811 Quadrature sampling system and hybrid equalizer 106 1996
6,049,573 Efficient polyphase quadrature digital tuner 103 1997
 
MEDIATEK INC. (2)
6,335,656 Direct conversion receivers and filters adapted for use therein 96 1999
2003/0078,011 Method for integrating a plurality of radio systems in a unified transceiver structure and the device of the same 59 2002
 
MICROSOFT CORPORATION (2)
6,169,733 Multiple mode capable radio receiver device 107 1997
7,050,058 Interactive water effects using texture coordinate shifting 15 2005
 
NXP B.V. (2)
5,052,050 Direct conversion FM receiver 118 1989
5,584,068 Direct conversion receiver 137 1995
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION (2)
5,574,755 I/Q quadraphase modulator circuit 123 1994
6,314,279 Frequency offset image rejection 99 1998
 
RENESAS ELECTRONICS CORPORATION (2)
6,014,551 Arrangement for transmitting and receiving radio frequency signal at two frequency bands 162 1997
6,865,399 Mobile telephone apparatus 64 2002
 
ROBERT BOSCH GMBH (2)
5,900,747 Sampling phase detector 105 1998
6,147,763 Circuitry for processing signals occurring in a heterodyne interferometer 98 1999
 
ROUND ROCK RESEARCH, LLC (2)
4,885,587 Multibit decorrelated spur digital radio frequency memory 109 1988
7,072,433 Delay locked loop fine tune 38 2001
 
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 102 1990
RE35494 Integrated active low-pass filter of the first order 101 1994
 
Small Power Communication Systems Research Laboratories Co., Ltd. (2)
5,369,800 Multi-frequency communication system with an improved diversity scheme 123 1992
5,448,602 Diversity radio receiver 110 1993
 
SONY ELECTRONICS INC. (2)
5,675,392 Mixer with common-mode noise rejection 114 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 95 1996
 
STC PLC (2)
4,521,892 Direct conversion radio receiver for FM signals 119 1982
4,583,239 Digital demodulator arrangement for quadrature signals 114 1984
 
TELASIC COMMUNICATIONS (2)
5,058,107 Efficient digital frequency division multiplexed signal receiver 95 1989
5,251,218 Efficient digital frequency division multiplexed signal receiver 133 1991
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (2)
5,015,963 Synchronous demodulator 103 1989
6,182,011 Method and apparatus for determining position using global positioning satellites 92 1998
 
The United States of America as represented by the Secretary of the Army (2)
4,563,773 Monolithic planar doped barrier subharmonic mixer 111 1984
5,982,329 Single channel transceiver with polarization diversity 85 1998
 
THOMSON CONSUMER ELECTRONICS, INC. (2)
5,446,421 Local oscillator phase noise cancelling modulation technique 109 1994
5,878,088 Digital variable symbol timing recovery system for QAM 98 1997
 
TRW INC. (2)
4,370,572 Differential sample-and-hold circuit 118 1980
6,813,320 Wireless telecommunications multi-carrier receiver architecture 49 2000
 
YOZAN INC. (2)
5,812,546 Demodulator for CDMA spread spectrum communication using multiple pn codes 101 1997
6,366,765 Receiver 37 1999
 
ZARBANA DIGITAL FUND, LLC (2)
7,194,044 Up/down conversion circuitry for radio transceiver 57 2002
7,212,581 Up / down conversion circuitry for radio transceiver 53 2006
 
AAI CORPORATION (1)
5,764,087 Direct digital to analog microwave frequency signal simulator 104 1995
 
Acrodyne Industries, Inc. (1)
5,724,002 Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) 104 1996
 
ADC TELECOMMUNICATIONS, INC. (1)
6,741,650 Architecture for intermediate frequency encoder 60 2000
 
ADVANCED MICRO DEVICES, INC. (1)
5,636,140 System and method for a flexible MAC layer interface in a wireless local area network 134 1995
 
AEL MICROTEL LIMITED (1)
4,481,490 Modulator utilizing high and low frequency carriers 103 1982
 
AEROFLEX PLAINVIEW, INC. (1)
5,970,053 Method and apparatus for controlling peak factor of coherent frequency-division-multiplexed systems 137 1996
 
AGENCE SPATIALE EUROPEENNE (1)
5,630,227 Satellite receiver having analog-to-digital converter demodulation 107 1995
 
AGILENT TECHNOLOGIES, INC. (1)
5,260,970 Protocol analyzer pod for the ISDN U-interface 118 1991
 
ALCATEL (1)
5,926,513 Receiver with analog and digital channel selectivity 104 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 109 1997
 
ALLIANT TECHSYSTEMS INC. (1)
5,150,124 Bandpass filter demodulation for FM-CW systems 104 1991
 
ALLIEDSIGNAL INC. (1)
5,805,460 Method for measuring RF pulse rise time, fall time and pulse width 71 1997
 
American Microsystems, Inc. (1)
4,210,872 High pass switched capacitor filter section 125 1978
 
AMERICAN NEURALOGIX, INC. (1)
5,218,562 Hamming data correlator having selectable word-length 100 1991
 
AMERICAN RADIO LLC (1)
5,864,754 System and method for radio signal reconstruction using signal processor 112 1996
 
ANALOG DEVICES, INC. (1)
5,495,200 Double sampled biquad switched capacitor filter 117 1993
 
Analytek, Ltd. (1)
4,922,452 10 Gigasample/sec two-stage analog storage integrated circuit for transient digitizing and imaging oscillography 110 1987
 
ANDREW LLC (1)
6,697,603 Digital repeater 173 1999
 
ANRITSU COMPANY (1)
5,113,094 Method and apparatus for increasing the high frequency sensitivity response of a sampler frequency converter 112 1990
 
APHEX LLC (1)
5,483,600 Wave dependent compressor 90 1994
 
AT&T Information Systems Inc. (1)
4,716,376 Adaptive FSK demodulator and threshold detector 119 1985
 
ATC TECHNOLOGIES, LLC (1)
5,454,007 Arrangement for and method of concurrent quadrature downconversion input sampling of a bandpass signal 139 1993
 
ATMEL CORPORATION (1)
5,461,646 Synchronization apparatus for a diversity receiver 95 1995
 
BAKER HUGHES INCORPORATED (1)
5,682,099 Method and apparatus for signal bandpass sampling in measurement-while-drilling applications 123 1995
 
Blaupunkt-Werke GmbH (1)
4,313,222 H-F Portion of TV receiver 48 1980
 
BROADCOM CORPORATION (1)
6,920,311 Adaptive radio transceiver with floating MOSFET capacitors 73 2004
 
BROWN UNIVERSITY RESEARCH FOUNDATION (1)
5,638,396 Laser ultrasonics-based material analysis system and method 109 1995
 
Bull HN Information Systems Inc. (1)
5,887,001 Boundary scan architecture analog extension with direct connections 75 1997
 
Burr-Brown Corporation (1)
5,172,019 Bootstrapped FET sampling switch 75 1992
 
CALLAHAN CELLULAR L.L.C. (1)
5,438,692 Direct conversion receiver 128 1993
 
CANADIAN SPACE AGENCY, THE, AN AGENCY OF THE GOVERNMENT OF CANADA (1)
5,592,131 System and method for modulating a carrier frequency 115 1994
 
CARDIAC PACEMAKERS, INC. (1)
6,076,015 Rate adaptive cardiac rhythm management device using transthoracic impedance 262 1998
 
CEDCOM NETWORK SYSTEMS, PTY. LTD. (1)
5,164,985 Passive universal communicator system 261 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 111 1991
 
CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
5,901,054 Pulse-width-modulation control circuit 105 1997
 
CIENA CORPORATION (1)
5,006,810 Second order active filters 105 1989
 
CIENCIA, INC. (1)
5,818,582 Apparatus and method for phase fluorometry 133 1997
 
Clarion Co., Ltd. (1)
5,293,398 Digital matched filter 161 1992
 
CLEVELAND MEDICAL DEVICES INC. (1)
6,223,061 Apparatus for low power radio communications 83 1997
 
COASES INVESTMENTS BROS. L.L.C. (1)
5,793,818 Signal processing system 159 1995
 
COGNEX CORPORATION (1)
6,608,647 Methods and apparatus for charge coupled device image acquisition with independent integration and readout 87 1998
 
COMSAT CORPORATION (1)
4,943,974 Detection of burst signal transmissions 120 1988
 
CONIFER CORPORATION (1)
5,020,149 Integrated down converter and interdigital filter apparatus and method for construction thereof 123 1988
 
CRYSTAL SEMICONDUCTOR CORPORATION (1)
6,560,451 Square wave analog multiplier 59 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 104 1994
 
CSR TECHNOLOGY INC. (1)
5,737,035 Highly integrated television tuner on a single microcircuit 293 1995
 
CTS CORPORATION (1)
5,513,389 Push pull buffer with noise cancelling symmetry 102 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 89 1992
 
DIASENSE, ICN. (1)
6,064,054 Synchronous detection for photoconductive detectors 102 1998
 
DREXEL UNIVERSITY (1)
5,465,418 Self-oscillating mixer circuits and methods therefor 103 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 106 1998
 
E-SYSTEMS, INC. (1)
4,346,477 Phase locked sampling radio receiver 122 1977
 
EADS SECURE NETWORKS OY (1)
5,901,349 Mixer device with image frequency rejection 153 1996
 
EATON CORPORATION (1)
4,245,355 Microwave frequency converter 109 1979
 
EDO COMMUNICATIONS AND COUNTERMEASURES SYSTEMS INC. (1)
5,140,699 Detector DC offset compensator 75 1990
 
EEV LIMITED (1)
5,463,357 Wide-band microwave modulator arrangements 105 1994
 
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
5,559,809 Transmit block up-converter for very small aperture terminal remote station 51 1995
 
ERICSSON AB (1)
6,363,262 Communication device having a wideband receiver and operating method therefor 106 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 104 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 104 1989
 
FOVEON, INC. (1)
6,512,544 Storage pixel sensor and array with compression 118 1998
 
FRANCE TELECOM (1)
5,678,220 Device for rejection of the image signal of a signal converted to an intermediate frequency 98 1995
 
FUJITSU COMPOUND SEMICONDUCTOR, INC. (1)
5,903,827 Single balanced frequency downconverter for direct broadcast satellite transmissions and hybrid ring signal combiner 115 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 93 1997
 
FUNAI ELECTRIC CO., LTD. (1)
5,777,692 Receiver based methods and devices for combating co-channel NTSC interference in digital transmission 127 1996
 
FUTURE CAPITAL L.L.C. (1)
5,905,433 Trailer communications system 88 1996
 
GENERAL DYNAMICS C4 SYSTEMS, INC. (1)
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Other [Check patent profile for assignment information] (12)
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6,005,903 Digital correlator 106 1996

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (29)
8,295,406 Universal platform module for a plurality of communication protocols 3 2000
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 19 2004
7,773,688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 21 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 24 2005
7,653,158 Gain control in a communication channel 25 2006
7,693,230 Apparatus and method of differential IQ frequency up-conversion 22 2006
7,724,845 Method and system for down-converting and electromagnetic signal, and transforms for same 23 2006
7,936,022 Method and circuit for down-converting a signal 14 2008
7,991,815 Methods, systems, and computer program products for parallel correlation and applications thereof 13 2008
7,937,059 Converting an electromagnetic signal via sub-sampling 14 2008
7,693,502 Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships 21 2008
8,407,061 Networking methods and systems 0 2008
7,865,177 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 16 2009
7,826,817 Applications of universal frequency translation 20 2009
7,894,789 Down-conversion of an electromagnetic signal with feedback control 15 2009
8,019,291 Method and system for frequency down-conversion and frequency up-conversion 13 2009
8,233,855 Up-conversion based on gated information signal 4 2009
8,446,994 Gain control in a communication channel 0 2009
7,929,638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 15 2010
8,036,304 Apparatus and method of differential IQ frequency up-conversion 13 2010
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 4 2010
8,077,797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 13 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 3 2010
8,160,534 Applications of universal frequency translation 7 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 4 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 4 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 5 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 4 2011
8,190,108 Method and system for frequency up-conversion 5 2011
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 25 2007

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