US Patent No: 7,218,899

Number of patents in Portfolio can not be more than 2000

Apparatus, system, and method for up-converting electromagnetic signals

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ALSO PUBLISHED AS: 20060019617
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, 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
Looke, Richard C Jacksonville, FL 136 4839
Moses, Jr Charley D Jacksonville, FL 55 4067
Rawlins, Gregory S Heathrow, FL 189 3989
Rawlins, Michael W Lake Mary, FL 164 3873
Sorrells, David F Middleburg, FL 264 6901

Cited Art

Patent Info (Count) # Cites Year
 
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2009/0132,648 CONTENT DELIVERY AND GLOBAL TRAFFIC MANAGEMENT NETWORK SYSTEM 3 2009
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PARKERVISION, INC. (42)
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
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
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
7,082,171 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
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
7,050,508 Method and system for frequency up-conversion with a variety of transmitter configurations 56 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
6,963,734 Differential frequency down-conversion using techniques of universal frequency translation technology 70 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
7,107,028 Apparatus, system, and method for up converting electromagnetic signals 58 2004
2005/0085,208 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 2 2004
 
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FUJITSU LIMITED (7)
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6,121,819 Switching down conversion mixer for use in multi-stage receiver architectures 103 1998
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QUALCOMM INCORPORATED (7)
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KABUSHIKI KAISHA TOSHIBA (6)
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TEXAS INSTRUMENTS INCORPORATED (6)
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CANON KABUSHIKI KAISHA (5)
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MITSUBISHI DENKI KABUSHIKI KAISHA (5)
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NOKIA MOBILE PHONES LTD. (5)
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RAYTHEON COMPANY (5)
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5,883,548 Demodulation system and method for recovering a signal of interest from an undersampled, modulated carrier 98 1997
 
Thomson-CSF (5)
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
4,967,160 Frequency multiplier with programmable order of multiplication 126 1989
 
UNWIRED PLANET, LLC (5)
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
 
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
 
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 133 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 Corporation (4)
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
 
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
 
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
 
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
 
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
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (3)
5,841,811 Quadrature sampling system and hybrid equalizer 106 1996
5,903,198 Planar gyrator 14 1997
6,049,573 Efficient polyphase quadrature digital tuner 103 1997
 
PROTOCOL-IP.COM, L.L.C. (3)
4,944,025 Direct conversion FM receiver with offset 182 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
 
SAMSUNG ELECTRONICS CO., LTD. (3)
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
5,825,254 Frequency converter for outputting a stable frequency by feedback via a phase locked loop 125 1997
 
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 195 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
 
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
 
ERICSSON INC. (2)
5,894,496 Method and apparatus for detecting and compensating for undesired phase shift in a radio transceiver 150 1996
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
 
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 155 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
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
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
 
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
 
NXP B.V. (2)
5,052,050 Direct conversion FM receiver 118 1989
5,584,068 Direct conversion receiver 136 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
 
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
 
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
 
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
 
BAKER HUGHES INCORPORATED (1)
5,682,099 Method and apparatus for signal bandpass sampling in measurement-while-drilling applications 122 1995
 
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
 
CDC PROPRIETE INTELLECTUELLE (1)
6,230,000 Product detector and method therefor 100 1998
 
CEDCOM NETWORK SYSTEMS, PTY. LTD. (1)
5,164,985 Passive universal communicator system 260 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
 
CIRRUS LOGIC, INC. (1)
6,084,465 Method for time constant tuning of gm-C filters 100 1998
 
Clarion Co., Ltd. (1)
5,293,398 Digital matched filter 161 1992
 
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 290 1995
 
CTS CORPORATION (1)
5,513,389 Push pull buffer with noise cancelling symmetry 102 1995
 
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
 
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
 
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)
6,085,073 Method and system for reducing the sampling rate of a signal for use in demodulating high modulation index frequency modulated signals 90 1998
 
GENERAL DYNAMICS DECISION SYSTEMS, INC. (1)
5,517,688 MMIC FET mixer and method 109 1994
 
GENERAL INSTRUMENT CORPORATION (1)
5,131,014 Apparatus and method for recovery of multiphase modulated data 69 1991
 
GLENAYRE ELECTRONICS, INC. (1)
5,557,642 Direct conversion receiver for multiple protocols 167 1994
 
Grumman Aerospace Corporation (1)
5,083,050 Modified cascode mixer circuit 113 1990
 
GRUNDIG MULTIMEDIA B.V. (1)
5,493,721 Receiver for a digital radio signal 105 1993
 
GTE AUTOMATIC ELECTRIC INCORPORATED, A CORP. OF DE. (1)
4,446,438 Switched capacitor n-path filter 133 1981
 
HAMAMATSU PHOTONICS K.K. (1)
5,847,594 Solid-state image sensing device 72 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 112 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 66 1986
 
Hitachi Denshi Kabushiki Kaisha (1)
5,926,065 Digital modulator having a digital filter including low-speed circuit components 99 1997
 
HITACHI, LTD. (1)
4,769,612 Integrated switched-capacitor filter with improved frequency characteristics 110 1987
 
Honeywell Inc. (1)
5,263,198 Resonant loop resistive FET mixer 71 1991
 
HP HOLDINGS THREE, INC. (1)
5,136,267 Tunable bandpass filter system and filtering method 121 1990
 
HTC CORPORATION (1)
5,907,197 AC/DC portable power connecting architecture 122 1997
 
HUGHES NETWORK SYSTEMS, INC. (1)
4,250,458 Baseband DC offset detector and control circuit for DC coupled digital demodulator 102 1979
 
ICOM INCORPORATED (1)
5,555,453 Radio communication system 116 1995
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (1)
5,736,895 Biquadratic switched-capacitor filter using single operational amplifier 126 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 166 1996
 
INTELLECTUAL VENTURES II LLC (1)
5,661,424 Frequency hopping synthesizer using dual gate amplifiers 112 1993
 
INTERMEC CORPORATION (1)
5,495,500 Homodyne radio architecture for direct sequence spread spectrum data reception 157 1994
 
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION (1)
4,577,157 Zero IF receiver AM/FM/PM demodulator using sampling techniques 113 1983
 
INTERSTATE ELECTRONICS CORPORATION (1)
5,640,424 Direct downconverter circuit for demodulator in digital data transmission system 124 1995
 
IPR LICENSING, INC. (1)
6,959,178 Tunable upconverter mixer with image rejection 81 2003
 
ITT Aerospace Optical (1)
4,761,798 Baseband phase modulator apparatus employing digital techniques 96 1987
 
Kabushiki Kaisha Suwa Seikosha (1)
4,517,519 FSK Demodulator employing a switched capacitor filter and period counters 113 1981
 
KENWOOD CORPORATION (1)
5,062,122 Delay-locked loop circuit in spread spectrum receiver 85 1988
 
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY (1)
6,892,062 Current-reuse bleeding mixer 74 2001
 
KOREA TELECOM (1)
6,091,289 Low pass filter 89 1998
 
KYOCERA CORPORATION (1)
5,901,187 Diversity reception device 111 1998
 
L-1 SECURE CREDENTIALING, INC. (FORMERLY KNOWN AS DIGIMARC CORPORATION) (1)
5,907,149 Identification card with delimited usage 178 1994
 
LANDIS & GYR BETRIEBS AG (1)
5,287,516 Demodulation process for binary data 103 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 96 1995
 
LEVEL ONE COMMUNICATIONS, INC. (1)
6,313,685 Offset cancelled integrator 91 2000
 
LICENTIA PATENT-VERWALTUNGS-GMBH (1)
5,179,731 Frequency conversion circuit 108 1990
 
LIYUE CAPITAL, LLC (1)
5,640,415 Bit error performance of a frequency hopping, radio communication system 112 1994
 
LOCKHEED MARTIN ELECTRONIC SYSTMES CANADA INC. (1)
5,563,550 Recovery of data from amplitude modulated signals with self-coherent demodulation 100 1995
 
LSI LOGIC CORPORATION (1)
6,591,310 Method of responding to I/O request and associated reply descriptor 165 2000
 
MARTIN MARIETTA CORPORATION (1)
5,440,311 Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler filtering 114 1993
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
6,212,369 Merged variable gain mixers 86 1998
 
MCEWAN TECHNOLOGIES, LLC (1)
5,986,600 Pulsed RF oscillator and radar motion sensor 85 1998
 
MEASUREMENT SPECIALTIES, INC. (1)
4,816,704 Frequency-to-voltage converter 101 1987
 
MEDIATEK INC. (1)
6,335,656 Direct conversion receivers and filters adapted for use therein 96 1999
 
MICROSOFT CORPORATION (1)
6,169,733 Multiple mode capable radio receiver device 107 1997
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,465,415 Even order term mixer 110 1992
 
Nippon Electric Co., Ltd. (1)
4,355,401 Radio transmitter/receiver for digital and analog communications system 124 1980
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (1)
4,633,510 Electronic circuit capable of stably keeping a frequency during presence of a burst 88 1984
 
NORTHERN TELECOM LIMITED (1)
6,026,286 RF amplifier, RF mixer and RF receiver 203 1996
 
NORTHPOINT TECHNOLOGY, LTD. (1)
6,208,636 Apparatus and method for processing signals selected from multiple data streams 92 1998
 
NORTHROP GRUMMAN CORPORATION (1)
5,859,878 Common receive module for a programmable digital radio 173 1995
 
NORTHROP GRUMMAN SYSTEMS CORPORATION (1)
6,054,889 Mixer with improved linear range 119 1997
 
NOSSWITZ, MANFRED (1)
5,911,116 Transmitting-receiving switch-over device complete with semiconductors 116 1997
 
NTT Data Communications Systems Corporation (1)
5,903,553 Enhanced signal collision detection method in wireless communication system 114 1996
 
NYNEX SCIENCE & TECHNOLOGY, INC. (1)
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Other [Check patent profile for assignment information] (12)
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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (49)
7,515,896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 31 2000
8,295,406 Universal platform module for a plurality of communication protocols 3 2000
7,379,515 Phased array antenna applications of universal frequency translation 45 2001
7,460,584 Networking methods and systems 31 2002
7,379,883 Networking methods and systems 41 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 44 2002
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
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 19 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 32 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 42 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 30 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
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 30 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 35 2005
7,697,916 Applications of universal frequency translation 22 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 40 2006
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
7,599,421 Spread spectrum applications of universal frequency translation 28 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 30 2006
8,160,196 Networking methods and systems 7 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 32 2007
7,936,022 Method and circuit for down-converting a signal 14 2008
7,554,508 Phased array antenna applications on universal frequency translation 32 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
 
NOKIA CORPORATION (3)
7,630,700 Multi-function passive frequency mixer 3 2006
7,844,233 Passive amplification of signals 1 2007
7,668,527 Multi-function passive frequency mixer 0 2007
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 25 2007

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