US Patent No: 7,822,401

Number of patents in Portfolio can not be more than 2000

Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor

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ALSO PUBLISHED AS: 20070293182
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, 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 in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate a bias signal. 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 4638
Cook, Robert W Switzerland, FL 140 4646
Looke, Richard C Jacksonville, FL 136 4647
Moses,, Jr Charley D - 58 495
Rawlins, Gregory S Heathrow, FL 185 3752
Rawlins, Michael W Lake Mary, FL 161 3648
Sorrells, David F Middleburg, FL 259 6572

Cited Art

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (76)
6,049,706 Integrated frequency translation and selectivity 122 1998
6,061,551 Method and system for down-converting electromagnetic signals 125 1998
6,061,555 Method and system for ensuring reception of a communications signal 109 1998
6,091,940 Method and system for frequency up-conversion 112 1998
6,370,371 Applications of universal frequency translation 105 1999
6,560,301 Integrated frequency translation and selectivity with a variety of filter embodiments 86 1999
6,580,902 Frequency translation using optimized switch structures 89 1999
6,687,493 Method and circuit for down-converting a signal using a complementary FET structure for improved dynamic range 89 1999
6,266,518 Method and system for down-converting electromagnetic signals by sampling and integrating over apertures 106 1999
6,421,534 Integrated frequency translation and selectivity 112 1999
6,647,250 Method and system for ensuring reception of a communications signal 93 1999
6,353,735 MDG method for output signal generation 96 1999
6,704,549 Multi-mode, multi-band communication system 95 2000
6,704,558 Image-reject down-converter and embodiments thereof, such as the family radio service 90 2000
7,006,805 Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service 63 2000
7,209,725 Analog zero if FM decoder and embodiments thereof, such as the family radio service 49 2000
6,634,555 Bar code scanner using universal frequency translation technology for up-conversion and down-conversion 83 2000
6,853,690 Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments 75 2000
6,879,817 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 70 2000
7,110,435 Spread spectrum applications of universal frequency translation 64 2000
6,798,351 Automated meter reader applications of universal frequency translation 78 2000
7,039,372 Method and system for frequency up-conversion with modulation embodiments 63 2000
7,065,162 Method and system for down-converting an electromagnetic signal, and transforms for same 69 2000
7,515,896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 29 2000
7,295,826 Integrated frequency translation and selectivity with gain control functionality, and applications thereof 47 2000
6,694,128 Frequency synthesizer using universal frequency translation technology 87 2000
6,873,836 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 78 2000
7,027,786 Carrier and clock recovery using universal frequency translation 58 2000
7,321,735 Optical down-converter using universal frequency translation technology 41 2000
7,082,171 Phase shifting applications of universal frequency translation 62 2000
7,054,296 Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation 153 2000
7,072,390 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 61 2000
7,110,444 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 63 2000
7,292,835 Wireless and wired cable modem applications of universal frequency translation technology 46 2001
7,379,515 Phased array antenna applications of universal frequency translation 43 2001
6,813,485 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 95 2001
7,010,286 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 67 2001
7,085,335 Method and apparatus for reducing DC offsets in a communication system 61 2001
7,010,559 Method and apparatus for a parallel correlator and applications thereof 69 2001
7,016,663 Applications of universal frequency translation 59 2002
7,236,754 Method and system for frequency up-conversion 51 2002
7,050,508 Method and system for frequency up-conversion with a variety of transmitter configurations 54 2002
7,379,883 Networking methods and systems 39 2002
7,460,584 Networking methods and systems 29 2002
7,072,427 Method and apparatus for reducing DC offsets in a communication system 75 2002
6,975,848 Method and apparatus for DC offset removal in a radio frequency communication channel 62 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 42 2002
7,272,164 Reducing DC offsets using spectral spreading 46 2002
6,963,734 Differential frequency down-conversion using techniques of universal frequency translation technology 68 2002
7,190,941 Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology 49 2002
7,224,749 Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology 48 2002
6,836,650 Methods and systems for down-converting electromagnetic signals, and applications thereof 79 2002
7,076,011 Integrated frequency translation and selectivity 57 2003
7,389,100 Method and circuit for down-converting a signal 38 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 40 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 30 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 42 2004
7,107,028 Apparatus, system, and method for up converting electromagnetic signals 56 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 51 2004
2005/0085,208 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 2 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 40 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 30 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 28 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 49 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 22 2005
7,245,886 Method and system for frequency up-conversion with modulation embodiments 47 2005
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 28 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 83 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 33 2005
7,218,907 Method and circuit for down-converting a signal 49 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 38 2006
7,653,158 Gain control in a communication channel 23 2006
7,599,421 Spread spectrum applications of universal frequency translation 26 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 28 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 30 2007
7,554,508 Phased array antenna applications on universal frequency translation 30 2008
 
MOTOROLA, INC. (24)
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5,003,621 Direct conversion FM receiver 162 1989
5,212,827 Zero intermediate frequency noise blanker 130 1991
5,444,865 Generating transmit injection from receiver first and second injections 109 1991
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5,410,270 Differential amplifier circuit having offset cancellation and method therefor 137 1994
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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (18)
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5,757,870 Spread spectrum communication synchronizing method and its circuit 97 1995
5,600,680 High frequency receiving apparatus 91 1995
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5,760,629 DC offset compensation device 88 1996
5,818,869 Spread spectrum communication synchronizing method and its circuit 96 1997
6,067,329 VSB demodulator 97 1997
5,903,178 Semiconductor integrated circuit 119 1997
5,945,660 Communication system for wireless bar code reader 147 1997
6,275,542 Direct conversion receiver including mixer down-converting incoming signal, and demodulator operating on downconverted signal 52 1998
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6,600,795 Receiving circuit 84 1999
6,313,700 Power amplifier and communication unit 62 2000
 
U.S. PHILIPS CORPORATION (15)
4,405,835 Receiver for AM stereo signals having a circuit for reducing distortion due to overmodulation 37 1981
4,488,119 FM Demodulator 87 1982
4,518,935 Band-rejection filter of the switched capacitor type 103 1983
4,743,858 R. F. power amplifier 148 1986
4,768,187 Signal transmission system and a transmitter and a receiver for use in the system 126 1986
4,890,302 Circuit for extracting carrier signals 103 1987
4,845,389 Very high frequency mixer 76 1988
4,968,958 Broad bandwidth planar power combiner/divider device 37 1989
5,113,129 Apparatus for processing sample analog electrical signals 110 1989
5,241,561 Radio receiver 133 1991
5,159,710 Zero IF receiver employing, in quadrature related signal paths, amplifiers having substantially sinh.sup.-1 transfer characteristics 109 1991
5,619,538 Pulse shaping FM demodular with low noise where capacitor charge starts on input signal edge 100 1995
5,903,609 Transmission system using transmitter with phase modulator and frequency multiplier 110 1996
5,793,817 DC offset reduction in a transmitter 106 1996
6,112,061 Radio communication device 50 1998
 
MOTOROLA MOBILITY LLC (12)
5,423,082 Method for a transmitter to compensate for varying loading without an isolator 122 1993
5,579,341 Multi-channel digital transceiver and method 136 1994
5,668,836 Split frequency band signal digitizer and method 123 1994
5,748,683 Multi-channel transceiver having an adaptive antenna array and method 120 1995
5,710,998 Method and apparatus for improved zero intermediate frequency receiver latency 111 1995
5,705,955 Frequency locked-loop using a microcontroller as a comparator 131 1995
5,901,347 Fast automatic gain control circuit and method for zero intermediate frequency receivers and radiotelephone using same 120 1996
5,689,413 Voltage convertor for a portable electronic device 110 1996
5,901,344 Method and apparatus for improved zero intermediate frequency receiver latency 102 1997
5,949,827 Continuous integration digital demodulator for use in a communication device 89 1997
6,321,073 Radiotelephone receiver and method with improved dynamic range and DC offset correction 117 2000
6,625,470 Transmitter 50 2000
 
LUCENT TECHNOLOGIES INC. (11)
5,724,653 Radio receiver with DC offset correction circuit 184 1994
5,745,846 Channelized apparatus for equalizing carrier powers of multicarrier signal 121 1995
5,602,847 Segregated spectrum RF downconverter for digitization systems 119 1995
5,767,726 Four terminal RF mixer device 109 1996
6,298,065 Method for multi-mode operation of a subscriber line card in a telecommunications system 69 1997
6,078,630 Phase-based receiver with multiple sampling frequencies 85 1998
6,167,247 Local oscillator leak cancellation circuit 40 1998
6,198,941 Method of operating a portable communication device 114 1998
6,618,579 Tunable filter with bypass 100 1999
6,437,639 Programmable RC filter 90 2000
2002/0132,642 Common module combiner/active array multicarrier approach without linearization loops 56 2001
 
NEC CORPORATION (11)
4,806,790 Sample-and-hold circuit 116 1988
4,841,265 Surface acoustic wave filter 94 1988
5,091,921 Direct conversion receiver with dithering local carrier frequency for detecting transmitted carrier frequency 112 1990
5,260,973 Device operable with an excellent spectrum suppression 84 1991
5,196,806 Output level control circuit for use in RF power amplifier 117 1991
5,410,195 Ripple-free phase detector using two sample-and-hold circuits 70 1992
5,353,306 Tap-weight controller for adaptive matched filter receiver 121 1992
5,379,040 Digital-to-analog converter 102 1993
5,339,054 Modulated signal transmission system compensated for nonlinear and linear distortion 121 1993
5,784,689 Output control circuit for transmission power amplifying circuit 124 1995
6,175,728 Direct conversion receiver capable of canceling DC offset voltages 130 1998
 
QUALCOMM INCORPORATED (11)
5,446,422 Dual mode FM and DQPSK modulator 121 1994
5,757,858 Dual-mode digital FM communication system 169 1997
5,896,562 Transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands 185 1997
5,982,315 Multi-loop .SIGMA. .DELTA. analog to digital converter 140 1997
6,005,506 Receiver with sigma-delta analog-to-digital converter for sampling a received signal 126 1997
6,137,321 Linear sampling switch 38 1999
6,088,348 Configurable single and dual VCOs for dual- and tri-band wireless communication systems 67 1999
6,366,622 Apparatus and method for wireless communications 286 1999
6,973,476 System and method for communicating data via a wireless high speed link 70 2000
6,731,146 Method and apparatus for reducing PLL lock time 50 2000
6,909,739 Signal acquisition system for spread spectrum receiver 63 2000
 
ROCKWELL INTERNATIONAL CORPORATION (11)
4,241,451 Single sideband signal demodulator 90 1978
4,253,067 Baseband differentially phase encoded radio signal detector 121 1978
4,363,976 Subinterval sampler 48 1981
4,463,320 Automatic gain control circuit 36 1982
4,484,143 CCD Demodulator circuit 92 1982
4,772,853 Digital delay FM demodulator with filtered noise dither 87 1987
4,814,649 Dual gate FET mixing apparatus with feedback means 73 1987
5,095,533 Automatic gain control system for a direct conversion receiver 117 1990
5,095,536 Direct conversion receiver with tri-phase architecture 135 1990
5,249,203 Phase and gain error control system for use in an I/Q direct conversion receiver 153 1991
5,564,097 Spread intermediate frequency radio receiver with adaptive spurious rejection 101 1994
 
MOTOROLA SOLUTIONS, INC. (10)
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5,559,468 Feedback loop closure in a linear transmitter 42 1993
5,483,691 Zero intermediate frequency receiver having an automatic gain control circuit 143 1994
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5,602,868 Multiple-modulation communication system 157 1995
5,898,912 Direct current (DC) offset compensation method and apparatus 124 1996
5,903,196 Self centering frequency multiplier 104 1997
6,121,819 Switching down conversion mixer for use in multi-stage receiver architectures 101 1998
5,973,570 Band centering frequency multiplier 39 1998
6,225,848 Method and apparatus for settling and maintaining a DC offset 105 2000
 
SONY CORPORATION (10)
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6,910,015 Sales activity management system, sales activity management apparatus, and sales activity management method 58 2001
 
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MITSUBISHI DENKI KABUSHIKI KAISHA (8)
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NOKIA MOBILE PHONES LTD. (8)
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2002/0172,293 Non-zero complex weighted space-time code for multiple antenna transmission 2001
 
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5,790,587 Multi-band, multi-mode spread-spectrum communication system 119 1995
6,072,996 Dual band radio receiver 53 1997
6,150,890 Dual band transmitter for a cellular phone comprising a PLL 113 1998
6,516,185 Automatic gain control and offset correction 128 2000
2004/0125,879 Information transmission unit 58 2002
 
KABUSHIKI KAISHA TOSHIBA (7)
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5,634,207 Frequency converter capable of reducing noise components in local oscillation signals 81 1996
6,204,789 Variable resistor circuit and a digital-to-analog converter 93 2000
7,197,081 System and method for receiving OFDM signal 38 2001
6,690,232 Variable gain amplifier 112 2002
 
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5,778,022 Extended time tracking and peak energy in-window demodulation for use in a direct sequence spread spectrum system 115 1995
6,125,271 Front end filter circuitry for a dual band GSM/DCS cellular phone 104 1998
6,057,714 Double balance differential active ring mixer with current shared active input balun 126 1998
6,404,823 Envelope feedforward technique with power control for efficient linear RF power amplification 152 1998
6,307,894 Power amplification using a direct-upconverting quadrature mixer topology 135 1999
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (7)
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6,400,963 Harmonic suppression in dual band mobile phones 104 1999
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TEXAS INSTRUMENTS INCORPORATED (7)
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4,862,121 Switched capacitor filter 112 1987
5,444,415 Modulation and demodulation of plural channels using analog and digital components 120 1994
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6,445,726 Direct conversion radio receiver using combined down-converting and energy spreading mixing signal 70 1999
7,358,801 Reducing noise and/or power consumption in a switched capacitor amplifier sampling a reference voltage 32 2005
 
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6,192,225 Direct conversion receiver 66 1998
6,611,569 Down/up-conversion apparatus and method 87 1998
6,567,483 Matched filter using time-multiplexed precombinations 64 1999
6,546,061 Signal transformation method and apparatus 35 2001
 
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RAYTHEON COMPANY (6)
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4,365,217 Charge-transfer switched-capacity filter 99 1980
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4,363,132 Diversity radio transmission system having a simple and economical structure 102 1981
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4,967,160 Frequency multiplier with programmable order of multiplication 123 1989
 
APPLE INC. (5)
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5,918,167 Quadrature downconverter local oscillator leakage canceller 79 1997
6,094,084 Narrowband LC folded cascode structure 110 1998
6,327,313 Method and apparatus for DC offset correction 102 1999
 
CANON KABUSHIKI KAISHA (5)
5,267,023 Signal processing device 102 1991
5,465,071 Information signal processing apparatus 101 1995
5,771,442 Dual mode transmitter 114 1995
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6,459,721 Spread spectrum receiving apparatus 85 1998
 
LOCKHEED MARTIN CORPORATION (5)
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4,888,557 Digital subharmonic sampling down-converter 133 1989
5,020,745 Reaction wheel fricton compensation using dither 28 1989
 
RCA CORPORATION (5)
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4,286,283 Transcoder 70 1979
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5,157,687 Packet data communication network 282 1990
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6,215,475 Highly integrated portable electronic work slate unit 106 1995
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THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY (5)
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WI-LAN INC. (5)
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6,404,758 System and method for achieving slot synchronization in a wideband CDMA system in the presence of large initial frequency errors 68 1999
 
GENERAL ELECTRIC COMPANY (4)
4,902,979 Homodyne down-converter with digital Hilbert transform filtering 120 1989
4,982,353 Subsampling time-domain digital filter using sparsely clocked output latch 121 1989
5,896,304 Low power parallel correlator for measuring correlation between digital signal segments 123 1997
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IBIQUITY DIGITAL CORPORATION (4)
5,278,826 Method and apparatus for digital audio broadcasting and reception 150 1991
5,315,583 Method and apparatus for digital audio broadcasting and reception 184 1991
5,523,726 Digital quadriphase-shift keying modulator 105 1994
5,768,323 Symbol synchronizer using modified early/punctual/late gate technique 117 1994
 
MITEL SEMICONDUCTOR LIMITED (4)
5,303,417 Mixer for direct conversion receiver 152 1991
5,451,899 Direct conversion FSK receiver using frequency tracking filters 107 1994
6,211,718 Low voltage double balanced mixer 78 1998
6,308,058 Image reject mixer 98 1998
 
MURATA MANUFACTURING CO., LTD. (4)
5,694,096 Surface acoustic wave filter 109 1996
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5,680,078 Mixer 104 1996
5,903,421 High-frequency composite part 109 1997
 
RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE (4)
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5,321,852 Circuit and method for converting a radio frequency signal into a baseband signal 132 1991
5,604,732 Up-link access apparatus in direct sequence code division multiple access system 124 1994
5,659,372 Digital TV detector responding to final-IF signal with vestigial sideband below full sideband in frequency 43 1995
5,825,254 Frequency converter for outputting a stable frequency by feedback via a phase locked loop 123 1997
 
SCIENTIFIC-ATLANTA, INC. (4)
5,191,459 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 139 1989
5,230,097 Offset frequency converter for phase/amplitude data measurement receivers 111 1990
5,379,141 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 108 1992
5,500,758 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links 111 1994
 
TEKTRONIX, INC. (4)
4,621,217 Anti-aliasing filter circuit for oscilloscopes 111 1984
4,751,468 Tracking sample and hold phase detector 104 1986
4,757,538 Separation of L+R from L-R in BTSC system 108 1986
4,688,253 L+R separation system 102 1986
 
ALCATEL TELSPACE (3)
5,490,176 Detecting false-locking and coherent digital demodulation using the same 93 1992
5,416,803 Process for digital transmission and direct conversion receiver 124 1993
5,760,645 Demodulator stage for direct demodulation of a phase quadrature modulated signal and receiver including a demodulator stage of this kind 102 1996
 
ECHELON CORPORATION (3)
5,239,686 Transceiver with rapid mode switching capability 137 1991
5,404,127 Power line communication while avoiding determinable interference harmonics 152 1993
5,355,114 Reconstruction of signals using redundant channels 166 1994
 
GOOGLE INC. (3)
6,041,073 Multi-clock matched filter for receiving signals with multipath 98 1998
6,823,178 High-speed point-to-point modem-less microwave radio frequency link using direct frequency modulation 73 2001
6,741,139 Optical to microwave converter using direct modulation phase shift keying 71 2002
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (3)
5,428,640 Switch circuit for setting and signaling a voltage level 100 1992
5,705,949 Compensation method for I/Q channel imbalance errors 144 1996
5,768,118 Reciprocating converter 124 1996
 
HITACHI AMERICA, LTD. (3)
5,282,023 Apparatus for NTSC signal interference cancellation through the use of digital recursive notch filters 154 1992
5,400,084 Method and apparatus for NTSC signal interference cancellation using recursive digital notch filters 150 1993
5,325,204 Narrowband interference cancellation through the use of digital recursive notch filters 136 1993
 
HITACHI DENSHI KABUSHIKI KAISHA (3)
5,512,946 Digital video signal processing device and TV camera device arranged to use it 39 1995
5,926,065 Digital modulator having a digital filter including low-speed circuit components 97 1997
6,512,798 Digital communication system of orthogonal modulation type 40 1999
 
HUGHES ELECTRONICS CORPORATION (3)
4,995,055 Time shared very small aperture satellite terminals 139 1988
5,390,215 Multi-processor demodulator for digital cellular base station employing partitioned demodulation procedure with pipelined execution 78 1992
5,495,202 High spectral purity digital waveform synthesizer 114 1993
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (3)
5,894,239 Single shot with pulse width controlled by reference oscillator 103 1997
5,872,446 Low voltage CMOS analog multiplier with extended input dynamic range 107 1997
6,128,746 Continuously powered mainstore for large memory subsystems 96 1997
 
INTERSIL CORPORATION (3)
5,493,581 Digital down converter and method 113 1992
5,633,815 Formatter 90 1995
5,841,324 Charge-based frequency locked loop and method 93 1996
 
ITT MANUFACTURING ENTERPRISES, INC. (3)
5,126,682 Demodulation method and apparatus incorporating charge coupled devices 110 1991
5,483,549 Receiver having for charge-coupled-device based receiver signal processing 201 1994
5,557,641 Charge-coupled-device based transmitters and receivers 103 1994
 
LAWRENCE LIVERMORE NATIONAL SECURITY, LLC (3)
5,471,162 High speed transient sampler 140 1992
5,479,120 High speed sampler and demultiplexer 139 1994
5,523,760 Ultra-wideband receiver 203 1994
 
M&FC HOLDING, LLC (3)
RE35829 Binary phase shift keying modulation system and/or frequency multiplier 136 1995
5,999,561 Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset 198 1997
6,639,939 Direct sequence spread spectrum method computer-based product apparatus and system tolerant to frequency reference offset 136 1999
 
PROTOCOL-IP.COM, L.L.C. (3)
4,944,025 Direct conversion FM receiver with offset 180 1988
4,893,341 Digital receiver operating at sub-nyquist sampling rate 107 1989
5,263,194 Zero if radio receiver for intermittent operation 132 1990
 
SHARP KABUSHIKI KAISHA (3)
5,444,416 Digital FM demodulation apparatus demodulating sampled digital FM modulated wave 100 1994
5,960,033 Matched filter 106 1997
6,775,684 Digital matched filter 56 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 642 1993
5,640,698 Radio frequency signal reception using frequency shifting by discrete-time sub-sampling down-conversion 193 1995
6,963,626 Noise-reducing arrangement and method for signal processing 78 1999
 
VICTOR COMPANY OF JAPAN, LTD. (3)
4,472,785 Sampling frequency converter 143 1981
4,984,077 Signal converting apparatus 119 1989
5,539,770 Spread spectrum modulating apparatus using either PSK or FSK primary modulation 106 1994
 
VISTEON GLOBAL TECHNOLOGIES, INC. (3)
5,222,144 Digital quadrature radio receiver with two-step processing 144 1991
5,490,173 Multi-stage digital RF translator 111 1993
5,483,193 Circuit for demodulating FSK signals 105 1995
 
YAMAHA CORPORATION (3)
4,801,823 Sample hold circuit 101 1987
5,499,267 Spread spectrum communication system 105 1993
6,018,262 CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter 91 1998
 
ALCATEL N.V. (2)
4,718,113 Zero-IF receiver wih feedback loop for suppressing interfering signals 121 1986
5,933,467 Multirate receive device and method using a single adaptive interpolation filter 108 1996
 
AT&T CORP. (2)
5,481,570 Block radio and adaptive arrays for wireless systems 161 1993
5,515,014 Interface between SAW filter and Gilbert cell mixer 126 1994
 
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY (2)
5,065,409 FSK discriminator 101 1989
5,777,771 Generation of optical signals with RF components 117 1996
 
CDC PROPRIETE INTELLECTUELLE (2)
6,230,000 Product detector and method therefor 98 1998
6,441,694 Method and apparatus for generating digitally modulated signals 60 2000
 
CIRRUS LOGIC, INC. (2)
6,084,465 Method for time constant tuning of gm-C filters 98 1998
6,597,240 Circuits and methods for slew rate control and current limiting in switch-mode systems 65 2001
 
DAITA FRONTIER FUND, LLC (2)
6,084,922 Waiting circuit 95 1998
6,512,785 Matched filter bank 59 1999
 
EASTMAN KODAK COMPANY (2)
4,591,930 Signal processing for high resolution electronic still camera 69 1983
4,791,584 Sub-nyquist interferometry 125 1986
 
EFRATOM TIME AND FREQUENCY PRODUCTS, INC. (2)
5,714,910 Methods and apparatus for digital frequency generation in atomic frequency standards 100 1994
5,721,514 Digital frequency generation in atomic frequency standards using digital phase shifting 107 1996
 
EXELIS INC. (2)
5,729,829 Interference mitigation method and apparatus for multiple collocated transceivers 114 1996
5,901,348 Apparatus for enhancing sensitivity in compressive receivers and method for the same 99 1997
 
GTE LENKURT INCORPORATED (2)
4,504,803 Switched capacitor AM modulator/demodulator 103 1982
4,510,467 Switched capacitor DSB modulator/demodulator 86 1982
 
HARRIS CORPORATION (2)
5,390,364 Least-mean squares adaptive digital filter havings variable size loop bandwidth 124 1992
5,337,014 Phase noise measurements utilizing a frequency down conversion/multiplier, direct spectrum measurement technique 153 1992
 
HUGHES AIRCRAFT COMPANY (2)
4,470,145 Single sideband quadricorrelator 113 1982
4,740,792 Vehicle location system 280 1986
 
INFINEON TECHNOLOGIES AG (2)
5,953,642 System for contactless power and data transmission 101 1997
6,633,194 Mixer 75 2001
 
INTELLECTUAL KEYSTONE TECHNOLOGY LLC (2)
2005/0156,168 System and methods for driving an electro-optical device 2005
2005/0156,168 System and methods for driving an electro-optical device 2005
 
INTELLECTUAL VENTURES II LLC (2)
5,661,424 Frequency hopping synthesizer using dual gate amplifiers 110 1993
6,246,695 Variable rate and variable mode transmission system 111 1998
 
KABUSHIKI KAISHA KENWOOD (2)
4,871,987 FSK or am modulator with digital waveform shaping 104 1988
4,855,894 Frequency converting apparatus 98 1988
 
KONINKLIJKE PHILIPS ELECTRONICS N.V. (2)
6,393,070 Digital communication device and a mixer 71 1998
2003/0149,579 Method of increasing functionality of a product 57 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 126 1998
6,686,879 Method and apparatus for transmitting and receiving signals having a carrier interferometry architecture 114 2001
 
MARCONI INSTRUMENTS LIMITED (2)
4,320,361 Amplitude and frequency modulators using a switchable component controlled by data signals 108 1979
4,914,405 Frequency synthesizer 100 1988
 
MARTINEZ,MICHAEL G. (2)
5,434,546 Circuit for simultaneous amplitude modulation of a number of signals 101 1993
5,463,356 FM band multiple signal modulator 103 1994
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (2)
5,841,811 Quadrature sampling system and hybrid equalizer 104 1996
6,049,573 Efficient polyphase quadrature digital tuner 101 1997
 
MEDIATEK INC. (2)
6,335,656 Direct conversion receivers and filters adapted for use therein 94 1999
2003/0078,011 Method for integrating a plurality of radio systems in a unified transceiver structure and the device of the same 57 2002
 
NXP B.V. (2)
5,052,050 Direct conversion FM receiver 116 1989
5,584,068 Direct conversion receiver 134 1995
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION (2)
5,574,755 I/Q quadraphase modulator circuit 121 1994
6,314,279 Frequency offset image rejection 97 1998
 
ROBERT BOSCH GMBH (2)
5,900,747 Sampling phase detector 103 1998
6,147,763 Circuitry for processing signals occurring in a heterodyne interferometer 96 1999
 
ROUND ROCK RESEARCH, LLC (2)
4,885,587 Multibit decorrelated spur digital radio frequency memory 107 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 100 1990
RE35494 Integrated active low-pass filter of the first order 99 1994
 
SMALL POWER COMMUNICATION SYSTEMS RESEARCH LABORATORIES CO., LTD. (2)
5,369,800 Multi-frequency communication system with an improved diversity scheme 121 1992
5,448,602 Diversity radio receiver 108 1993
 
SONY ELECTRONICS INC. (2)
5,675,392 Mixer with common-mode noise rejection 112 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 93 1996
 
STC PLC (2)
4,521,892 Direct conversion radio receiver for FM signals 117 1982
4,583,239 Digital demodulator arrangement for quadrature signals 112 1984
 
TELASIC COMMUNICATIONS (2)
5,058,107 Efficient digital frequency division multiplexed signal receiver 93 1989
5,251,218 Efficient digital frequency division multiplexed signal receiver 131 1991
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (2)
5,015,963 Synchronous demodulator 101 1989
6,182,011 Method and apparatus for determining position using global positioning satellites 89 1998
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE ARMY (2)
4,563,773 Monolithic planar doped barrier subharmonic mixer 109 1984
5,982,329 Single channel transceiver with polarization diversity 83 1998
 
THOMSON CONSUMER ELECTRONICS, INC. (2)
5,446,421 Local oscillator phase noise cancelling modulation technique 107 1994
5,878,088 Digital variable symbol timing recovery system for QAM 96 1997
 
TRW INC. (2)
4,370,572 Differential sample-and-hold circuit 116 1980
6,813,320 Wireless telecommunications multi-carrier receiver architecture 47 2000
 
YOZAN INC. (2)
5,812,546 Demodulator for CDMA spread spectrum communication using multiple pn codes 99 1997
6,366,765 Receiver 35 1999
 
ZARBANA DIGITAL FUND, LLC (2)
7,194,044 Up/down conversion circuitry for radio transceiver 54 2002
7,212,581 Up / down conversion circuitry for radio transceiver 51 2006
 
AAI CORPORATION (1)
5,764,087 Direct digital to analog microwave frequency signal simulator 102 1995
 
ACRODYNE INDUSTRIES, INC. (1)
5,724,002 Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) 102 1996
 
ADC TELECOMMUNICATIONS, INC. (1)
6,741,650 Architecture for intermediate frequency encoder 58 2000
 
ADVANCED MICRO DEVICES, INC. (1)
5,636,140 System and method for a flexible MAC layer interface in a wireless local area network 131 1995
 
AEL MICROTEL LIMITED (1)
4,481,490 Modulator utilizing high and low frequency carriers 101 1982
 
AEROFLEX PLAINVIEW, INC. (1)
5,970,053 Method and apparatus for controlling peak factor of coherent frequency-division-multiplexed systems 134 1996
 
AGENCE SPATIALE EUROPEENNE (1)
5,630,227 Satellite receiver having analog-to-digital converter demodulation 105 1995
 
AGILENT TECHNOLOGIES, INC. (1)
5,260,970 Protocol analyzer pod for the ISDN U-interface 116 1991
 
ALCATEL (1)
5,926,513 Receiver with analog and digital channel selectivity 102 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 107 1997
 
ALLIANT TECHSYSTEMS INC. (1)
5,150,124 Bandpass filter demodulation for FM-CW systems 102 1991
 
ALLIEDSIGNAL INC. (1)
5,805,460 Method for measuring RF pulse rise time, fall time and pulse width 69 1997
 
AMERICAN MICROSYSTEMS, INC. (1)
4,210,872 High pass switched capacitor filter section 123 1978
 
AMERICAN NEURALOGIX, INC. (1)
5,218,562 Hamming data correlator having selectable word-length 98 1991
 
AMERICAN RADIO LLC (1)
5,864,754 System and method for radio signal reconstruction using signal processor 110 1996
 
ANALOG DEVICES, INC. (1)
5,495,200 Double sampled biquad switched capacitor filter 115 1993
 
ANALYTEK, LTD. (1)
4,922,452 10 Gigasample/sec two-stage analog storage integrated circuit for transient digitizing and imaging oscillography 108 1987
 
ANDREW LLC (1)
6,697,603 Digital repeater 169 1999
 
ANRITSU COMPANY (1)
5,113,094 Method and apparatus for increasing the high frequency sensitivity response of a sampler frequency converter 110 1990
 
APHEX LLC (1)
5,483,600 Wave dependent compressor 88 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 116 1985
 
ATC TECHNOLOGIES, LLC (1)
5,454,007 Arrangement for and method of concurrent quadrature downconversion input sampling of a bandpass signal 137 1993
 
ATMEL CORPORATION (1)
5,461,646 Synchronization apparatus for a diversity receiver 93 1995
 
BAKER HUGHES INCORPORATED (1)
5,682,099 Method and apparatus for signal bandpass sampling in measurement-while-drilling applications 120 1995
 
BLAUPUNKT-WERKE GMBH (1)
4,313,222 H-F Portion of TV receiver 46 1980
 
BROADCOM CORPORATION (1)
6,920,311 Adaptive radio transceiver with floating MOSFET capacitors 70 2004
 
BROWN UNIVERSITY RESEARCH FOUNDATION (1)
5,638,396 Laser ultrasonics-based material analysis system and method 107 1995
 
BULL HN INFORMATION SYSTEMS INC. (1)
5,887,001 Boundary scan architecture analog extension with direct connections 73 1997
 
BURR-BROWN CORPORATION (1)
5,172,019 Bootstrapped FET sampling switch 73 1992
 
CALLAHAN CELLULAR L.L.C. (1)
5,438,692 Direct conversion receiver 126 1993
 
CANADIAN SPACE AGENCY, THE, AN AGENCY OF THE GOVERNMENT OF CANADA (1)
5,592,131 System and method for modulating a carrier frequency 113 1994
 
CARDIAC PACEMAKERS, INC. (1)
6,076,015 Rate adaptive cardiac rhythm management device using transthoracic impedance 258 1998
 
CEDCOM NETWORK SYSTEMS, PTY. LTD. (1)
5,164,985 Passive universal communicator system 258 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 109 1991
 
CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
5,901,054 Pulse-width-modulation control circuit 103 1997
 
CIENA CORPORATION (1)
5,006,810 Second order active filters 103 1989
 
CIENCIA, INC. (1)
5,818,582 Apparatus and method for phase fluorometry 131 1997
 
CLARION CO., LTD. (1)
5,293,398 Digital matched filter 159 1992
 
CLEVELAND MEDICAL DEVICES INC. (1)
6,223,061 Apparatus for low power radio communications 81 1997
 
COASES INVESTMENTS BROS. L.L.C. (1)
5,793,818 Signal processing system 157 1995
 
COGNEX CORPORATION (1)
6,608,647 Methods and apparatus for charge coupled device image acquisition with independent integration and readout 85 1998
 
COMSAT CORPORATION (1)
4,943,974 Detection of burst signal transmissions 118 1988
 
CONIFER CORPORATION (1)
5,020,149 Integrated down converter and interdigital filter apparatus and method for construction thereof 121 1988
 
CRYSTAL SEMICONDUCTOR CORPORATION (1)
6,560,451 Square wave analog multiplier 57 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 102 1994
 
CSR TECHNOLOGY INC. (1)
5,737,035 Highly integrated television tuner on a single microcircuit 288 1995
 
CTS CORPORATION (1)
5,513,389 Push pull buffer with noise cancelling symmetry 100 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 86 1992
 
DIASENSE, ICN. (1)
6,064,054 Synchronous detection for photoconductive detectors 99 1998
 
DREXEL UNIVERSITY (1)
5,465,418 Self-oscillating mixer circuits and methods therefor 101 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 104 1998
 
E-SYSTEMS, INC. (1)
4,346,477 Phase locked sampling radio receiver 120 1977
 
EADS SECURE NETWORKS OY (1)
5,901,349 Mixer device with image frequency rejection 151 1996
 
EATON CORPORATION (1)
4,245,355 Microwave frequency converter 107 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 103 1994
 
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
5,559,809 Transmit block up-converter for very small aperture terminal remote station 49 1995
 
ERICSSON AB (1)
6,363,262 Communication device having a wideband receiver and operating method therefor 104 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 102 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 102 1989
 
FOVEON, INC. (1)
6,512,544 Storage pixel sensor and array with compression 116 1998
 
FRANCE TELECOM (1)
5,678,220 Device for rejection of the image signal of a signal converted to an intermediate frequency 96 1995
 
FUJITSU COMPOUND SEMICONDUCTOR, INC. (1)
5,903,827 Single balanced frequency downconverter for direct broadcast satellite transmissions and hybrid ring signal combiner 113 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 91 1997
 
FUNAI ELECTRIC CO., LTD. (1)
5,777,692 Receiver based methods and devices for combating co-channel NTSC interference in digital transmission 125 1996
 
FUTURE CAPITAL L.L.C. (1)
5,905,433 Trailer communications system 86 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 88 1998
 
GENERAL DYNAMICS DECISION SYSTEMS, INC. (1)
5,517,688 MMIC FET mixer and method 107 1994
 
GENERAL INSTRUMENT CORPORATION (1)
5,131,014 Apparatus and method for recovery of multiphase modulated data 67 1991
 
GLENAYRE ELECTRONICS, INC. (1)
5,557,642 Direct conversion receiver for multiple protocols 165 1994
 
GRUMMAN AEROSPACE CORPORATION (1)
5,083,050 Modified cascode mixer circuit 111 1990
 
GRUNDIG MULTIMEDIA B.V. (1)
5,493,721 Receiver for a digital radio signal 103 1993
 
GTE AUTOMATIC ELECTRIC INCORPORATED, A CORP. OF DE. (1)
4,446,438 Switched capacitor n-path filter 131 1981
 
HAMAMATSU PHOTONICS K.K. (1)
5,847,594 Solid-state image sensing device 70 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 110 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 64 1986
 
HITACHI, LTD. (1)
4,769,612 Integrated switched-capacitor filter with improved frequency characteristics 108 1987
 
HONEYWELL INC. (1)
5,263,198 Resonant loop resistive FET mixer 69 1991
 
HP HOLDINGS THREE, INC. (1)
5,136,267 Tunable bandpass filter system and filtering method 119 1990
 
HTC CORPORATION (1)
5,907,197 AC/DC portable power connecting architecture 120 1997
 
HUGHES NETWORK SYSTEMS, INC. (1)
4,250,458 Baseband DC offset detector and control circuit for DC coupled digital demodulator 100 1979
 
ICOM INCORPORATED (1)
5,555,453 Radio communication system 114 1995
 
IFR LIMITED (1)
5,781,600 Frequency synthesizer 40 1995
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (1)
5,736,895 Biquadratic switched-capacitor filter using single operational amplifier 124 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 163 1996
 
INTERMEC CORPORATION (1)
5,495,500 Homodyne radio architecture for direct sequence spread spectrum data reception 152 1994
 
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION (1)
4,577,157 Zero IF receiver AM/FM/PM demodulator using sampling techniques 111 1983
 
INTERSTATE ELECTRONICS CORPORATION (1)
5,640,424 Direct downconverter circuit for demodulator in digital data transmission system 122 1995
 
IPR LICENSING, INC. (1)
6,959,178 Tunable upconverter mixer with image rejection 78 2003
 
ITT AEROSPACE OPTICAL (1)
4,761,798 Baseband phase modulator apparatus employing digital techniques 94 1987
 
KABEN WIRELESS SILICON INC. (1)
6,829,311 Complex valued delta sigma phase locked loop demodulator 47 2000
 
KABUSHIKI KAISHA SUWA SEIKOSHA (1)
4,517,519 FSK Demodulator employing a switched capacitor filter and period counters 111 1981
 
KENWOOD CORPORATION (1)
5,062,122 Delay-locked loop circuit in spread spectrum receiver 83 1988
 
KOLLMORGEN ARTUS (1)
5,483,245 ILS signal analysis device and method 40 1993
 
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
6,892,062 Current-reuse bleeding mixer 72 2001
 
KOREA TELECOM (1)
6,091,289 Low pass filter 87 1998
 
KYOCERA CORPORATION (1)
5,901,187 Diversity reception device 109 1998
 
L-1 SECURE CREDENTIALING, INC. (FORMERLY KNOWN AS DIGIMARC CORPORATION) (1)
5,907,149 Identification card with delimited usage 176 1994
 
LANDIS & GYR BETRIEBS AG (1)
5,287,516 Demodulation process for binary data 101 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 94 1995
 
LEVEL ONE COMMUNICATIONS, INC. (1)
6,313,685 Offset cancelled integrator 89 2000
 
LEWIS SALES LLC (1)
6,038,265 Apparatus for amplifying a signal using digital pulse width modulators 61 1997
 
LICENTIA PATENT-VERWALTUNGS-GMBH (1)
5,179,731 Frequency conversion circuit 106 1990
 
LIYUE CAPITAL, LLC (1)
5,640,415 Bit error performance of a frequency hopping, radio communication system 110 1994
 
LOCKHEED MARTIN ELECTRONIC SYSTMES CANADA INC. (1)
5,563,550 Recovery of data from amplitude modulated signals with self-coherent demodulation 98 1995
 
LSI LOGIC CORPORATION (1)
6,591,310 Method of responding to I/O request and associated reply descriptor 161 2000
 
MARTIN MARIETTA CORPORATION (1)
5,440,311 Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler filtering 112 1993
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
6,212,369 Merged variable gain mixers 84 1998
 
MCEWAN TECHNOLOGIES, LLC (1)
5,986,600 Pulsed RF oscillator and radar motion sensor 83 1998
 
MEASUREMENT SPECIALTIES, INC. (1)
4,816,704 Frequency-to-voltage converter 99 1987
 
MENTOR GRAPHICS CORPORATION (1)
6,195,539 Method and apparatus for rejecting image signals in a receiver 38 1998
 
MICROSOFT CORPORATION (1)
6,169,733 Multiple mode capable radio receiver device 105 1997
 
MINOLTA CAMERA KABUSHIKI KAISHA (1)
4,771,265 Double integration analog to digital converting device 47 1987
 
MOBILIAN (1)
7,193,965 Multi-wireless network configurable behavior 48 2000
 
MOBILIAN INC. (1)
6,894,988 Wireless apparatus having multiple coordinated transceivers for multiple wireless communication protocols 55 1999
 
MOSAID TECHNOLOGIES INCORPORATED (1)
6,441,659 Frequency-doubling delay locked loop 58 2000
 
MULTISPECTRAL SOLUTIONS, INC. (1)
6,690,741 Ultra wideband data transmission system and method 102 1999
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,465,415 Even order term mixer 108 1992
 
NEW JAPAN RADIO CO., LTD. (1)
5,982,810 Signal extraction circuit and correlator utilizing the circuit 38 1997
 
NIPPON ELECTRIC CO., LTD. (1)
4,355,401 Radio transmitter/receiver for digital and analog communications system 122 1980
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,633,510 Electronic circuit capable of stably keeping a frequency during presence of a burst 86 1984
 
NOKIA NETWORKS OY (1)
6,738,609 Receiver and method of receiving 41 2000
 
NORTHERN TELECOM LIMITED (1)
6,026,286 RF amplifier, RF mixer and RF receiver 199 1996
 
NORTHPOINT TECHNOLOGY, LTD. (1)
6,208,636 Apparatus and method for processing signals selected from multiple data streams 90 1998
 
NORTHROP GRUMMAN CORPORATION (1)
5,859,878 Common receive module for a programmable digital radio 170 1995
 
NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
6,054,889 Mixer with improved linear range 117 1997
 
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OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (12)
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4,811,422 Reduction of undesired harmonic components 73 1986
5,010,585 Digital data and analog radio frequency transmitter 130 1990
5,214,787 Multiple audio channel broadcast system 111 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 65 1991
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6,005,903 Digital correlator 104 1996

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (17)
8,295,406 Universal platform module for a plurality of communication protocols 1 2000
8,160,196 Networking methods and systems 5 2006
7,937,059 Converting an electromagnetic signal via sub-sampling 12 2008
7,894,789 Down-conversion of an electromagnetic signal with feedback control 13 2009
8,019,291 Method and system for frequency down-conversion and frequency up-conversion 11 2009
8,233,855 Up-conversion based on gated information signal 2 2009
7,929,638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 13 2010
8,036,304 Apparatus and method of differential IQ frequency up-conversion 11 2010
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 2 2010
8,077,797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 11 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 1 2010
8,160,534 Applications of universal frequency translation 5 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 2 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 2 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 3 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 2 2011
8,190,108 Method and system for frequency up-conversion 3 2011

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