28.8 dBm， High Efciency， Linear GaN Power Amplifier with In-phase Power Combining for IEEE 802.11p.pdf

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1、Thisarticlehasbeenacceptedforinclusioninafutureissueofthisjournal.Contentisfinalaspresented,withtheexceptionofpagination.IEEEMICROWAVEANDWIRELESSCOMPONENTSLETTERS128.8dBm,HighEfficiency,LinearGaNPowerAmplifierWithIn-PhasePowerCombiningforIEEE802.11pApplicationsPilsoonChoi,Member,IEEE,Chir

2、nChyeBoon,SeniorMember,IEEE,MengdaMao,andHangLiuAbstract—Thisletterpresentsapoweramplifier(PA)forIEEE802.11papplications,adoptinganewpowercombiningtech-niqueina250nmGaNprocess.Theproposedtechniqueisusedtoimprovethedrainefficiency(DE)acrosstheoutputpowerlevelsandmeetthestringenterrorvector

3、magnitude(EVM)require-mentwithoutanycomplicatedinputandoutputnetworks.ThePAisimplementedwithafabricatedGaNdieusingthechip-on-board(COB)technologyandtestedwith27MbpsIEEE802.11psignal.Itachieves30.5dBEVMat28.8dBmoutputpowerwithaback-offDEof22.4%at30Vsupplyat5.72GHzwithoutpre-distortion.It

4、alsomaintainsmorethan22%DEthroughsupplyvoltagecontrolwhilemeetingitslinearityrequirementacrossthewiderangeofoutputpowerlevels.Theproposedcircuittechniqueisviableforimprovingefficiencyandoptimizinglinearitywithitssimplearchitecture.IndexTerms—Drainefficiency,errorvectormagnitude,GaN,Fig.1.

5、(a)ClassicalEERPAarchitecture(b)ClassicalDohertyPAarchitecture.IEEE802.11p,poweramplifier(PA).theenvelopeandphasepaths.AnotherpopularapproachofcombininglinearandnonlinearPAsiscalledDohertyPAwhichI.INTRODUCTIONisdepictedinFig.1(b).Typically,aDohertyPAemploysEDICATEDshortrangecommunication

6、(DSRC)basedtransmissionlinesforpowercombiningtogetherwiththeloadDonIEEE802.11pstandard[1]isanemergingtechnologymodulation,andrequiresaphaseshiftertocompensatefortheforvehicularcommunications.Tomitigatemultipathandhighlyphaseshiftfromtheload,resultingintheincreaseofdesignmobilechannelenv

7、ironmentsbetweencars,IEEE802.11pspec-complexity.Recently,highlyefficientGaNDohertyPAs[3],ifiesadoubleguardintervalandahalfguardbandalongwith[4]areproposed,buttheyrequirecomplicatedpassivenetworkhigheroutputpowerwhencomparedwiththeIEEE802.11adesignwithlargedieareaandshowasharpdrop