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表五 SigmaTel美國核准專利列表（時間到2005年8月22日止）
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Publication
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Title
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Pub. Date
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Filed
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IPC Code
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US6906591
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Amplifier having MOS capacitor compensation
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2005-06-14
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2003-11-26
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H03F 3/16
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US6859156
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Variable bandgap reference and applications thereof
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2005-02-22
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2003-06-25
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H03M 1/66
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US6853171
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Low loss multiple output stage for a DC-to-DC converter
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2005-02-08
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2003-06-25
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G05F 1/40
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US6778119
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Method and apparatus for accurate digital-to-analog conversion
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2004-08-17
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2003-06-25
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H03M 1/66
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US6507223
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Differential line driver having adjustable common mode operation
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2003-01-14
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2001-02-22
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H03K 5/22
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US6373277
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Line driver having variable impedance termination
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2002-04-16
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2001-02-22
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H03K 17/16
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US6567027
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Method and apparatus for analog to digital conversion utilizing a moving sum
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2003-05-20
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2001-02-08
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H03M 7/00
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US6522275
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Method and apparatus for sample rate conversion for use in an analog to digital converter
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2003-02-18
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2001-02-08
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H03M 3/00
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US6633187
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Method and apparatus for enabling a stand alone integrated circuit
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2003-10-14
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2000-11-20
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H03K 3/02
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US6404172
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Method and apparatus for providing integrated buck or boost conversion
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2002-06-11
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2000-11-20
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G05F 1/40
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US6366522
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Method and apparatus for controlling power consumption of an integrated circuit
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2002-04-02
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2000-11-20
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G06F 1/26
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US6931139
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Computer audio system
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2005-08-16
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2000-10-17
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H03G 5/00
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US6329800
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Method and apparatus for reducing power consumption in driver circuits
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2001-12-11
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2000-10-17
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G05F 1/40
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US6362605
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Method and apparatus for providing power to an integrated circuit
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2002-03-26
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2000-08-24
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G05F 1/56
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US6584162
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Method and apparatus sample rate conversions in an analog to digital converter
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2003-06-24
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2000-07-31
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H04L 7/00
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US6753705
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Edge sensitive detection circuit
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2004-06-22
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2000-07-27
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H03K 5/22
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US6885900
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Method and apparatus for providing multiple channel audio in a computing system
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2005-04-26
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2000-07-10
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G06F 17/00
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US6522511
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High speed electrostatic discharge protection circuit
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2003-02-18
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2000-06-15
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H02H 3/22
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US6313770
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System for sampling an analog signal and method thereof
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2001-11-06
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2000-06-15
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H03M 1/52
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US6901127
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Method and apparatus for data recovery
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2005-05-31
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2000-04-26
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H04L 7/02
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US6535901
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Method and apparatus for generating a fast multiply accumulator
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2003-03-18
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2000-04-26
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G06F 7/50
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US6654900
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Method and apparatus for producing multiple clock signals having controlled duty cycles by controlling clock multiplier delay elements
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2003-11-25
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2000-04-19
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G06F 1/06
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US6362755
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Method and apparatus for sample rate conversion and applicants thereof
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2002-03-26
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2000-04-18
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H03M 7/00
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US6204651
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Method and apparatus for regulating an output voltage of a switch mode converter
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2001-03-20
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2000-04-18
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G05F 1/40
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US6857034
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Computer peripheral device incorporating infrared transmissions
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2005-02-15
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2000-04-14
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G06F 13/42
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US6211575
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Method and apparatus for identifying customized integrated circuits
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2001-04-03
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1999-08-18
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H01L 21/44
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US6137279
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Adjustable power control module and applications thereof
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2000-10-24
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1999-08-18
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G05F 3/16
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US6819677
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Method and apparatus for recovering data that was transported utilizing multiple data transport protocols
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2004-11-16
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1999-02-08
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H04J 3/22
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US6147634
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Method and apparatus for digital to analog conversion with reduced noise
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2000-11-14
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1998-12-15
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H03M 3/00
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US6526111
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Method and apparatus for phase locked loop having reduced jitter and/or frequency biasing
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2003-02-25
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1998-11-23
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H03D 3/24
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US6226663
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Method and apparatus for overflow detection in a decimation filter
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2001-05-01
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1998-11-23
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G06F 7/38
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US6175601
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Infra-red data processing circuit
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2001-01-16
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1998-11-23
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H04L 27/08
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US6128354
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Data detection pre-amplifier circuit
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2000-10-03
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1998-11-23
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H04L 27/08
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US6055283
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Data detection circuit
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2000-04-25
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1998-11-23
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H04L 27/08
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US6212230
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Method and apparatus for pulse position modulation
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2001-04-03
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1998-04-04
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H03M 5/08
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US6151149
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Method and apparatus for pulse pattern modulation
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2000-11-21
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1998-04-04
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H04B 10/04
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US5977822
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Method and apparatus of pulse position demodulation
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1999-11-02
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1998-04-04
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H03K 9/04
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US6608902
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Stereo signal separation circuit and application thereof
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2003-08-19
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1998-02-07
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H04R 5/00
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US6163580
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Method and apparatus for data detection with an enhanced adaptive threshold
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2000-12-19
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1997-06-09
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H04L 25/10
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US6144473
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Method and apparatus for transceiving infrared signals
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2000-11-07
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1997-06-09
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H04B 10/00
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US5933040
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Method and apparatus for a data detection circuit operating from a low voltage power source
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1999-08-03
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1997-06-09
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H03L 5/00
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US5892800
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Data detection circuit having a pre-amplifier circuit
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1999-04-06
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1997-03-20
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H04L 27/08
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US5815104
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Method and apparatus for digital to analog conversion
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1998-09-29
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1997-03-20
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H03M 1/66
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US5714909
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Transimpedance amplifier and method for constructing same
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1998-02-03
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1996-06-14
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H03F 3/08
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US5592165
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Method and apparatus for an oversampled digital to analog convertor
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1997-01-07
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1995-08-15
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H03M 3/02
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US5566101
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Method and apparatus for a finite impulse response filter processor
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1996-10-15
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1995-08-15
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G06F 17/10
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US5563553
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Method and apparatus for a controlled oscillation that may be used in a phase locked loop
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1996-10-08
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1995-08-15
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H03B 5/24
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