Anti-aliasing filter circuit for oscilloscopes

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4621217
SERIAL NO

06652700

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ATTORNEY / AGENT: (SPONSORED)

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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, OR786

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jones, Roydn Aloha, OR 7 153
Saxe, Charles L Beaverton, OR 13 298

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Patent Info (Count) # Cites Year
 
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CONEXANT SYSTEMS, INC. (1)
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6580902 Frequency translation using optimized switch structures 94 1999
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6647250 Method and system for ensuring reception of a communications signal 105 1999
6421534 Integrated frequency translation and selectivity 117 1999
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6798351 Automated meter reader applications of universal frequency translation 81 2000
7039372 Method and system for frequency up-conversion with modulation embodiments 100 2000
7515896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 34 2000
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7321735 Optical down-converter using universal frequency translation technology 44 2000
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6873836 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 84 2000
6694128 Frequency synthesizer using universal frequency translation technology 90 2000
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7460584 Networking methods and systems 34 2002
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7697916 Applications of universal frequency translation 23 2005
7376410 Methods and systems for down-converting a signal using a complementary transistor structure 41 2006
7653158 Gain control in a communication channel 28 2006
7693230 Apparatus and method of differential IQ frequency up-conversion 38 2006
7724845 Method and system for down-converting and electromagnetic signal, and transforms for same 26 2006
7599421 Spread spectrum applications of universal frequency translation 33 2006
7529522 Apparatus and method for communicating an input signal in polar representation 31 2006
8160196 Networking methods and systems 10 2006
7546096 Frequency up-conversion using a harmonic generation and extraction module 33 2007
7936022 Method and circuit for down-converting a signal 16 2008
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7991815 Methods, systems, and computer program products for parallel correlation and applications thereof 15 2008
7937059 Converting an electromagnetic signal via sub-sampling 18 2008
7693502 Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships 24 2008
8407061 Networking methods and systems 6 2008
7865177 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 26 2009
7826817 Applications of universal frequency translation 22 2009
7894789 Down-conversion of an electromagnetic signal with feedback control 20 2009
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8233855 Up-conversion based on gated information signal 9 2009
8446994 Gain control in a communication channel 9 2009
7929638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 16 2010
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8223898 Method and system for down-converting an electromagnetic signal, and transforms for same 9 2010
8077797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 18 2010
8295800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 8 2010
8160534 Applications of universal frequency translation 10 2010
8340618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 11 2010
8224281 Down-conversion of an electromagnetic signal with feedback control 10 2010
8190116 Methods and systems for down-converting a signal using a complementary transistor structure 10 2011
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8190108 Method and system for frequency up-conversion 9 2011
8594228 Apparatus and method of differential IQ frequency up-conversion 7 2011
 
SOCIONEXT INC. (2)
* 7421055 Signal processing apparatus and signal processing method 2 2003
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PARKER VISION (1)
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LAWRENCE LIVERMORE NATIONAL SECURITY, LLC (1)
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UNIVERSITAT BERN (1)
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* Cited By Examiner