高保真数字功率放大器设计(3)

高保真数字音频放大器设计

DesignofDigitalAudiopower

amplifier

Abstract

Thispaperintroducestheprincipleofdigitalaudioamplifier,anddissertatesthecriticalissuesindetail.Bycomparingstate-of-the-arttechnologiesinthisfield,adoublechannelfullydigitalaudiopoweramplifierisdevelopedwithatypialchipset.Thischipsetisinterfacedwithandcontrolledbyamicro-controller,formingacompletesystemforcommercialapplicaition.AnewkindofdigitalaudiopoweramplifierbasedonDSPisproposed.ItsamplestheaudioPCMsignalinhighspeed,dointerpolationofmulti-speedandfilteritbydigitalfilter.ThedigitalfiltersarehalfbandfilterandΣ-△modulation,alldesignedforhighspeedandhighsignalnoiseratio.Afterfilterthemodulatedsignalischangedintobinarysequence.ThenusethebinarysequencetodrivePowerMOStoproducepowersignalwithoriginalspectrum.Thisamplifierownthecharacterofhighefficiencyandhifiquality,andtheSNRcouldbeeasilypromoted.

KeyWords：pulsewidemodulation.pulsecodemodulation.oversampling,noiseshaping,digitalpoweramplifier.halfbandfilter

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