US Patent No: 4,621,217

Number of patents in Portfolio can not be more than 2000

Anti-aliasing filter circuit for oscilloscopes

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Abstract

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A digital storage oscilloscope is provided with an anti-aliasing filter circuit utilizing a first plurality of switchable analog filters that bandwidth limit frequencies greater than half the oscilloscope's sampling frequency, and a digital transversal filter effective at lower sweep rates and sampling rates for also bandwidth limiting frequencies greater than half the sampling frequency. The digital transversal filter is controllable to provide a different band pass characteristic for different sweep and sample rates. Both the selection of filters and the control of the digital filter are responsive to the oscilloscope's selection of sweep rate.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TEKTRONIX, INC.BEAVERTON, OR826

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jones, Roydn Redondo Beach, CA 7 126
Saxe, Charles L Portland, OR 14 283

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Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (100)
* 6,091,940 Method and system for frequency up-conversion 117 1998
* 6,061,551 Method and system for down-converting electromagnetic signals 137 1998
* 6,061,555 Method and system for ensuring reception of a communications signal 117 1998
* 6,049,706 Integrated frequency translation and selectivity 128 1998
6,370,371 Applications of universal frequency translation 109 1999
6,687,493 Method and circuit for down-converting a signal using a complementary FET structure for improved dynamic range 93 1999
6,580,902 Frequency translation using optimized switch structures 93 1999
6,560,301 Integrated frequency translation and selectivity with a variety of filter embodiments 89 1999
6,647,250 Method and system for ensuring reception of a communications signal 98 1999
6,421,534 Integrated frequency translation and selectivity 117 1999
6,266,518 Method and system for down-converting electromagnetic signals by sampling and integrating over apertures 111 1999
6,353,735 MDG method for output signal generation 101 1999
7,006,805 Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service 71 2000
6,704,549 Multi-mode, multi-band communication system 99 2000
6,704,558 Image-reject down-converter and embodiments thereof, such as the family radio service 93 2000
7,110,435 Spread spectrum applications of universal frequency translation 77 2000
6,879,817 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 74 2000
6,798,351 Automated meter reader applications of universal frequency translation 81 2000
7,039,372 Method and system for frequency up-conversion with modulation embodiments 87 2000
7,515,896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 32 2000
7,295,826 Integrated frequency translation and selectivity with gain control functionality, and applications thereof 52 2000
8,295,406 Universal platform module for a plurality of communication protocols 9 2000
7,321,735 Optical down-converter using universal frequency translation technology 44 2000
7,027,786 Carrier and clock recovery using universal frequency translation 62 2000
6,873,836 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 82 2000
6,694,128 Frequency synthesizer using universal frequency translation technology 90 2000
7,082,171 Phase shifting applications of universal frequency translation 65 2000
7,110,444 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 67 2000
7,072,390 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 66 2000
7,054,296 Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation 199 2000
7,292,835 Wireless and wired cable modem applications of universal frequency translation technology 49 2001
7,379,515 Phased array antenna applications of universal frequency translation 46 2001
6,813,485 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 103 2001
7,010,286 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 70 2001
7,085,335 Method and apparatus for reducing DC offsets in a communication system 64 2001
7,010,559 Method and apparatus for a parallel correlator and applications thereof 73 2001
7,236,754 Method and system for frequency up-conversion 54 2002
7,016,663 Applications of universal frequency translation 62 2002
7,460,584 Networking methods and systems 32 2002
7,379,883 Networking methods and systems 42 2002
7,050,508 Method and system for frequency up-conversion with a variety of transmitter configurations 59 2002
7,072,427 Method and apparatus for reducing DC offsets in a communication system 82 2002
6,975,848 Method and apparatus for DC offset removal in a radio frequency communication channel 69 2002
7,272,164 Reducing DC offsets using spectral spreading 49 2002
7,190,941 Method and apparatus for reducing DC offsets in communication systems using universal frequency translation technology 52 2002
6,963,734 Differential frequency down-conversion using techniques of universal frequency translation technology 73 2002
7,224,749 Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology 51 2002
6,836,650 Methods and systems for down-converting electromagnetic signals, and applications thereof 83 2002
7,076,011 Integrated frequency translation and selectivity 63 2003
7,389,100 Method and circuit for down-converting a signal 41 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 44 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 33 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 45 2004
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 20 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 54 2004
7,107,028 Apparatus, system, and method for up converting electromagnetic signals 59 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 35 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 44 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 32 2004
7,773,688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 26 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 52 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 25 2005
7,245,886 Method and system for frequency up-conversion with modulation embodiments 52 2005
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 32 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 36 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 90 2005
7,218,907 Method and circuit for down-converting a signal 52 2005
7,697,916 Applications of universal frequency translation 23 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 41 2006
7,653,158 Gain control in a communication channel 28 2006
7,693,230 Apparatus and method of differential IQ frequency up-conversion 30 2006
7,724,845 Method and system for down-converting and electromagnetic signal, and transforms for same 24 2006
7,599,421 Spread spectrum applications of universal frequency translation 31 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 31 2006
8,160,196 Networking methods and systems 10 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 33 2007
7,936,022 Method and circuit for down-converting a signal 16 2008
7,554,508 Phased array antenna applications on universal frequency translation 34 2008
7,991,815 Methods, systems, and computer program products for parallel correlation and applications thereof 15 2008
7,937,059 Converting an electromagnetic signal via sub-sampling 17 2008
7,693,502 Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships 23 2008
8,407,061 Networking methods and systems 6 2008
7,865,177 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 17 2009
7,826,817 Applications of universal frequency translation 21 2009
7,894,789 Down-conversion of an electromagnetic signal with feedback control 17 2009
8,019,291 Method and system for frequency down-conversion and frequency up-conversion 15 2009
8,233,855 Up-conversion based on gated information signal 9 2009
8,446,994 Gain control in a communication channel 7 2009
7,929,638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 16 2010
8,036,304 Apparatus and method of differential IQ frequency up-conversion 15 2010
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 9 2010
8,077,797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 16 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 8 2010
8,160,534 Applications of universal frequency translation 10 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 10 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 9 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 9 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 10 2011
8,190,108 Method and system for frequency up-conversion 9 2011
8,594,228 Apparatus and method of differential IQ frequency up-conversion 1 2011
 
TEKTRONIX, INC. (4)
* 4,789,950 Pre-interpolation adaptive filter 4 1986
* 5,122,734 Method and apparatus for prescaler desynchronization 0 1990
7,834,780 Waveform compression and display 2 2006
8,818,744 Test and measurement instrument and method of switching waveform display styles 0 2009
 
AGILENT TECHNOLOGIES, INC. (2)
* 5,115,189 Anti-aliasing dithering method and apparatus for low frequency signal sampling 18 1991
* 5,233,546 Anti-alias filtering apparatus for frequency domain measurements 24 1991
 
ANRITSU CORPORATION (1)
* 4,727,288 Digital wave observation apparatus 3 1985
 
CONEXANT SYSTEMS, INC. (1)
* 5,323,339 Digital anti-aliasing filter system 1 1992
 
FLUKE CORPORATION (1)
* 5,063,302 Wide band trigger system having switchable signal paths for extending the effective frequency range 0 1989
 
FUJITSU SEMICONDUCTOR LIMITED (1)
* 7,421,055 Signal processing apparatus and signal processing method 1 2003
 
KABUSHIKI KAISHA TOSHIBA (1)
* 4,970,637 Digital anti-aliasing filter 13 1988
 
LAWRENCE LIVERMORE NATIONAL SECURITY, LLC (1)
* 5,471,162 High speed transient sampler 154 1992
 
Parker Vision (1)
6,542,722 Method and system for frequency up-conversion with variety of transmitter configurations 100 1999
 
STMICROELECTRONICS S.A. (1)
* 7,511,570 Transconductance filtering circuit 1 2006
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 26 2007
* Cited By Examiner