An integrated 200-W class-D audio amplifier.pdf

《An integrated 200-W class-D audio amplifier.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、1198IEEEJOURNALOFSOLID-STATECIRCUITS,VOL.38,NO.7,JULY2003AnIntegrated200-WClass-DAudioAmplifierMarcoBerkhoutAbstract—Anintegratedstereoclass-Daudiopoweramplifierrealizedinasilicon-on-insulator(SOI)-basedBCDtechnologyispresented.Theamplifieriscapableofdelivering2100Wintwo4-loadsatasupplyvo

2、ltageof60V.Asecond-orderfeedbackloopisusedtosupresssupplyrippleandpulse-shapeerrorsintheswitchingpowerstage.Thelimitingfactorintheperformanceofanyclass-Damplifiersisthequalityoftheswitchingpowerstage.Ahigh-speedlow-currentlevelshifterandarobustdeadtimecon-trolarrangementareproposedthatena

3、bletherealizationofaro-busthigh-qualityswitchingpowerstage.Somepracticalissueswithrespecttorobustnessandelectromagneticcompatibilityaredis-Fig.1.CrosssectionofHV-DMOSinA-BCD.cussed.IndexTerms—Audioamplifiers,powerintegratedcircuits,reverserecoveryisoneofthemajorsourcesofelectromagneticpul

4、sewidthmodulation,silicon-on-insulatortechnology.interference(EMI).I.INTRODUCTIONIII.AMPLIFIERTOPOLOGYHEoperatingprinciplesofclass-DamplifiershavebeenAblockdiagramoftheamplifierisshowninFig.2.TheTknownforalongtime,butonlyrecentlyhavesemicon-amplifierconsistsoftwoidenticalaudiochannelsanda

5、ductormanufacturersbeenabletoproducereliableswitchingcommonsectionthatcontainsanoscillator,amodeinterface,powerstagesofsufficientquality.Theaudioperformanceofandanumberofreferencesandprotectioncircuits.Eachmodernclass-Damplifiersequalsorevenexceedsthatofcon-audiochannelhasacontrollerinwhi

6、chtheaudioinputsignalventionalclass-ABamplifiers.Thehighefficiencyofclass-Disconvertedtoapulsewidthmodulated(PWM)signal.Theamplifierscanbeexploitedtoreduceheatsinksize,increasecontrollerdrivesaswitchingpowerstagethatbooststhePWMoutputpower,and/orlengthenbatterylife.Especially,multi-signal

7、tohighpowerlevels.ThePWMoutputsignalisfedbackchannelDVDreceiversappeartobetheperfectapplicationfortothecontroller.Thefeedbackloopiscompletelyintegratedclass-Damplifiers.on-chip.ExternaldemodulationfiltersareusedtofiltertheaudiocontentofthePWMsignalandsuppresstheener