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Class Information
Number: 327/532
Name: Miscellaneous active electrical nonlinear devices, circuits, and systems > Specific identifiable device, circuit, or system > With specific source of supply or bias voltage > Fluctuating or ac source with rectifier or filter > With particular filter circuit
Description: Subject matter including a filter circuit with specific structure.

Patents under this class:

Patent Number Title Of Patent Date Issued
8531220 Loop filter Sep. 10, 2013
8350739 Reference current compensation circuit for D/A converter Jan. 8, 2013
8208590 Filter circuit, and receiver and electronic device using the same filter circuit Jun. 26, 2012
8130027 Apparatus and method for the detection and compensation of integrated circuit performance variation Mar. 6, 2012
8049487 Power measurement circuit Nov. 1, 2011
7944273 Active filtering May. 17, 2011
7932774 Structure for intrinsic RC power distribution for noise filtering of analog supplies Apr. 26, 2011
7805267 Apparatus, method and program for verification of transmission margin Sep. 28, 2010
7755420 Intrinsic RC power distribution for noise filtering of analog supplies Jul. 13, 2010
7733165 Circuit arrangement with interference protection Jun. 8, 2010
7692467 Capacitance for decoupling intermediate level power rails Apr. 6, 2010
7583136 Active filter for reduction of common mode current Sep. 1, 2009
7557638 Circuit for suppressing voltage jitter and method thereof Jul. 7, 2009
7449942 Intrinsic RC power distribution for noise filtering of analog supplies Nov. 11, 2008
7443229 Active filtering Oct. 28, 2008
7427882 Method and apparatus for switching on a voltage supply of a semiconductor circuit and corresponding semiconductor circuit Sep. 23, 2008
7423474 Selectable pole bias line filter Sep. 9, 2008
7385438 Active filter for reduction of common mode current Jun. 10, 2008
7362162 Line filter Apr. 22, 2008
7265459 High Q linear controlled variable capacitor Sep. 4, 2007
7205831 Noise filter circuit Apr. 17, 2007
7161415 Current modulation filter Jan. 9, 2007
7102420 Semiconductor device and manufacturing method thereof Sep. 5, 2006
6781432 Control circuit of MOSFET for synchronous rectification Aug. 24, 2004
6605980 Synchronous rectifier circuit Aug. 12, 2003
6577180 Correction system of resistance inaccuracy in an integrated circuit process Jun. 10, 2003
6369641 Biasing circuits Apr. 9, 2002
6191647 Low noise integrated circuit device for reducing a noise on LSI power supply nets to supply electric charges required to operate IC Feb. 20, 2001
6184746 PLL power supply filter (with pump) having a wide voltage range and immunity to oxide overstress Feb. 6, 2001
6127880 Active power supply filter Oct. 3, 2000
6091281 High precision reference voltage generator Jul. 18, 2000
5999039 Active power supply filter Dec. 7, 1999
5880619 Low power precision voltage splitter Mar. 9, 1999
5825238 Circuit for filtering a power supply for noise sensitive devices Oct. 20, 1998
5783965 Bias circuit Jul. 21, 1998
5729170 Frequency divider Mar. 17, 1998
5721484 Power supply filter with active element assist Feb. 24, 1998
5701098 AC bypass circuit which provides stabilization of high frequency transient noise Dec. 23, 1997
5684428 Sensor apparatus capable of preventing high frequency noise Nov. 4, 1997
5619166 Active filtering method and apparatus Apr. 8, 1997
5519654 Semiconductor memory device with external capacitor to charge pump in an EEPROM circuit May. 21, 1996
5508651 Sensor signal conditioning circuit Apr. 16, 1996
5498994 Active filter device Mar. 12, 1996
4496859 Notch filter system Jan. 29, 1985
4412141 Three state loop keyer Oct. 25, 1983
4075570 Circuit arrangement for transmitting an alternating current oscillation having direct current components which can be changed abruptly Feb. 21, 1978
4048523 Electronic filter with active elements Sep. 13, 1977
3955105 Synchronous detector May. 4, 1976

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