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1、3214IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.60,NO.10,OCTOBER2012ADual-BandParallelDohertyPowerAmplifierforWirelessApplicationsAndreiGrebennikov,SeniorMember,IEEE,andJamesWong,Member,IEEEAbstract—Inthispaper,anoveldual-bandtransmission-lineparallelDohertyamplifierarchitecturefora
2、ctiveantennaarraysandbase-stationapplicationsinnext-generationcommunica-tionsystemsispresented.ThecarrierandpeakingamplifiersusingGaNHEMTCreeCGH40010PdevicesaredesignedbasedonthereactancecompensationtechniquetoprovideoptimumClass-Eimpedanceseenbythedeviceoutputatthefundamentalfrequencyacr
3、ossthewidefrequencyrangeachievingdraineffi-cienciesover73%acrossthefrequencyrangefrom1.7to2.7GHz.Inasingle-carrierWCDMAoperationmodewithapeak-to-av-erageratioof6.5dB,highdrainefficienciesof40%–45%canbeachievedatanaverageoutputpowerof39dBmwithanofabout30dBcatcenterbandwidthfrequenciesof2.14
4、and2.655GHz.IndexTerms—BroadbandClassE,Dohertyamplifier,efficiency,GaNHEMT,reactancecompensation,RFpoweramplifier,trans-missionline.I.INTRODUCTIONNNEXT-GENERATIONfourth-generation(4G)/fifth-gen-Ieration(5G)telecommunicationsystems,itisrequiredthatFig.1.BlockdiagramofconventionalandmodifiedDoh
5、ertyamplifiers.theradiotransmitteringeneralandpoweramplifiersasitskeypartinparticularoperatewithhighefficiencyoverawideandintegrationforsmall-cellapplicationsarevitallyneededfrequencyrangetoprovidemultibandandmultistandardoper-keepingthesamehigh-performancecapability.ation.Besides,inthesesy
6、stemswithincreasedbandwidthandForaconventionalDohertyamplifierwithaquarter-wavehighdatarateusinganorthogonalfrequency-divisionmulti-impedancetransformerandaquarter-waveoutputcombiner,plexing(OFDM)transmissionmode,thetransmittingsignalisthemeasuredpower-addedefficiency(PAE)of31%atbackoffcha
7、racterizedbyhighpeak-to-averagepowerratiosduetowidepowerlevelsof6–7dBfromthesaturatedoutputpowerofandrapidvariationsoftheinstantaneoustransmittingpower.about43dBmwasachievedacrossthefrequencyrangeofTherefore,itisveryimportanttoprovidehighefficiencyat1.5–2.14GHz[1].Toimprov
