AU2001285491A1 - Circuits and methods for reducing interference from switched mode circuits - Google Patents

Circuits and methods for reducing interference from switched mode circuits

Info

Publication number
AU2001285491A1
AU2001285491A1 AU2001285491A AU8549101A AU2001285491A1 AU 2001285491 A1 AU2001285491 A1 AU 2001285491A1 AU 2001285491 A AU2001285491 A AU 2001285491A AU 8549101 A AU8549101 A AU 8549101A AU 2001285491 A1 AU2001285491 A1 AU 2001285491A1
Authority
AU
Australia
Prior art keywords
signal
circuits
frequency
pulse width
pattern rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2001285491A
Inventor
John Laurence Melanson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cirrus Logic Inc
Original Assignee
Cirrus Logic Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cirrus Logic Inc filed Critical Cirrus Logic Inc
Publication of AU2001285491A1 publication Critical patent/AU2001285491A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/331—Sigma delta modulation being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/351—Pulse width modulation being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/372—Noise reduction and elimination in amplifier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2215/00—Reducing interference at the transmission system level
    • H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics
    • H04B2215/065—Reduction of clock or synthesizer reference frequency harmonics by changing the frequency of clock or reference frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2215/00—Reducing interference at the transmission system level
    • H04B2215/069—Reduction of switch mode power supply ripple

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Noise Elimination (AREA)
  • Networks Using Active Elements (AREA)

Abstract

A method of generating a pulse width modulated data stream includes providing a first clock signal having a first frequency and selecting a divisor from a set of divisors for dividing the first frequency to select a pattern rate of a pulse width modulated data stream and thereby shift in frequency noise generated at the pattern rate during pulse width modulation. The first frequency of the first signal is divided to generate a second signal at the selected pattern rate. Noise shaping and requantizing is performed on the second signal to generate a noise shaped and requantized second signal and the pulse width modulated data stream having patterns at the selected pattern rate is generated in response to the first signal and the noise shaped and requantized second signal.
AU2001285491A 2000-08-30 2001-08-29 Circuits and methods for reducing interference from switched mode circuits Abandoned AU2001285491A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US65182100A 2000-08-30 2000-08-30
US09/651,821 2000-08-30
PCT/US2001/041923 WO2002019551A2 (en) 2000-08-30 2001-08-29 Circuits and methods for reducing interference from switched mode circuits

Publications (1)

Publication Number Publication Date
AU2001285491A1 true AU2001285491A1 (en) 2002-03-13

Family

ID=24614362

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001285491A Abandoned AU2001285491A1 (en) 2000-08-30 2001-08-29 Circuits and methods for reducing interference from switched mode circuits

Country Status (9)

Country Link
US (2) US7010271B2 (en)
EP (1) EP1314256B1 (en)
JP (1) JP2004507967A (en)
AT (1) ATE381814T1 (en)
AU (1) AU2001285491A1 (en)
DE (1) DE60131989T2 (en)
DK (1) DK1314256T3 (en)
TW (1) TW519792B (en)
WO (1) WO2002019551A2 (en)

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KR100638472B1 (en) * 2004-11-08 2006-10-26 삼성전자주식회사 Digital audio amplifier, audio system including the same, and method of amplifying an audio signal
JP2006173819A (en) * 2004-12-14 2006-06-29 Sharp Corp Switching amplifier
US7474893B2 (en) * 2004-12-29 2009-01-06 Silicon Laboratories, Inc. System including a communication apparatus having a digital audio interface for audio testing with radio isolation
US7676197B2 (en) * 2005-06-30 2010-03-09 Intel Corporation Signal spectrum steering method, apparatus, and system
US7528586B2 (en) * 2005-12-21 2009-05-05 Honeywell International Inc. Harmonics related synchronization for switching regulators
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WO2009122333A2 (en) * 2008-03-31 2009-10-08 Nxp B.V. Digital modulator
RU2011119116A (en) * 2008-10-13 2012-11-20 Конинклейке Филипс Электроникс Н.В. (Nl) PULSE POWER SUPPLY
US8294445B2 (en) * 2008-12-04 2012-10-23 Qualcomm Incorporated Switching voltage regulator with frequency selection
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TWI380580B (en) * 2009-08-20 2012-12-21 Richtek Technology Corp Variable frequency class-d amplifier and a control method thereof and a ramp generator for the variable freguency class-d amplifier and a method thereof
US8391512B2 (en) 2009-09-25 2013-03-05 Onkyo Corporation Broadcast wave receiving system
US8145149B2 (en) * 2010-06-17 2012-03-27 R2 Semiconductor, Inc Operating a voltage regulator at a switching frequency selected to reduce spurious signals
FR2978313B1 (en) * 2011-07-18 2014-02-21 Thales Sa METHOD FOR PRESERVING SENSITIVITY OF RADIO FREQUENCY EQUIPMENT AND RADIO FREQUENCY EQUIPMENT
JP6024175B2 (en) * 2012-04-18 2016-11-09 富士電機株式会社 Switching power supply
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US9837958B2 (en) * 2015-06-08 2017-12-05 Maxlinear, Inc. Crystal (xtal) oscillator with high interference immunity
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JP7067259B2 (en) * 2018-05-18 2022-05-16 株式会社デンソー Inverter control system

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Also Published As

Publication number Publication date
DK1314256T3 (en) 2008-05-05
DE60131989D1 (en) 2008-01-31
US7199744B1 (en) 2007-04-03
US7010271B2 (en) 2006-03-07
US20040100328A1 (en) 2004-05-27
EP1314256B1 (en) 2007-12-19
TW519792B (en) 2003-02-01
EP1314256A2 (en) 2003-05-28
JP2004507967A (en) 2004-03-11
WO2002019551A2 (en) 2002-03-07
DE60131989T2 (en) 2008-12-11
ATE381814T1 (en) 2008-01-15
WO2002019551A3 (en) 2002-08-15

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