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1、ANewHigh-EfficiencyandSuper-FidelityAnalabgAudioAmplifierwiththeaidofDigitalSwitchingAmplifier:ClassK,AmplifierNam-SungJung,Nam-InKimandGyu-Hyeong,ChoDept.ofElectricalEngineeringKoreaAdvancedInstituteofScienceandTechnology(KAIST)373-1,Kusong-Dong,Yusong-Gu,Taejon,305-7011,KoreaTEL:+82-42-869-3424,F
2、AX:+82-42-869-3410,E-mail:nsjung@cais.kaist.ac.krABSTRACT-Thispaperpresentsanaudioamplifierthatswitchingpoweramplifier[8].Inthepastdecade,thesimultaneouslyhastheadvantagesofdigitalandanalogtopologyofswitchingconverterforpowerapplicationhasamplifier.Thehighefficiencyisachievedbythedigitalbeengivenmo
3、reattentionthanthecontrolschemeofamplifier,whichisplayingaroleofdependentcurrentswitchingamplifier[9,10,111.Recently,afewcontrolsource.Thehighfidelityisguaranteedbytheanalogschemeswereintroducedinaudioapplicationsofnonlinearamplifierplayingaroleofindependentvoltagesource.PWMscheme[12].Asfarasauthor
4、sknow,noliteraturesExperimentalresultsshowthattheproposedamplifierhaveaddressedtheaudioamplifierthatsimultaneouslyhashasthe0.005%totalharmonicdistortion(THD)andbothofhighefficiencyandhighfidelityexceptthepaperofaround90%powerefficiencyat50Woutput.~131.Anewnovelconceptofaudioamplifierisproposedinthi
5、spaper.Theproposedamplifier[14],namedbyusclassK,I.INTRODUCTIONamplifier,iscomposedoftwoblocks,thatis,analogamplifierblockand(digitalamplifierblock:theanalogTherehavebeenstudiedmanyamplifiersfortheaudioamplifierplaysaroleofindependentvoltagesourceandtheapplication.AnalogamplifierssuchasclassA,BandAB
6、aredigitalamplifierplaysaroleofdependentcurrentsourcebasedonthelinercircuittechnology.Althoughthelinearcontrolledbysignalcurrentofanalogamplifier.Basicamplifiershaveexcellentdistortioncharacteristics,theyconceptisrealizedbycombiningonlytheadvantagesofunfortunatelyhavepoorefficiency,thus,theyarebulk
7、yinbothofanaloganddigitalamplifier:theadvantageofanalogvolumeforcooling.amplifierhavingexcelllenttotalharmonicdistortion(THD)TodatewiththeadventoftheGreenRound,mostofismixedwiththatofdigitalamplifierthathas
