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1、CONTRIBUTEDPAPERHigh-EfficiencyDohertyPowerAmplifiers:HistoricalAspectandModernTrendsThisoverviewoftheDohertyamplifiercoversbroadbandcapabilitiesofatwo-stageamplifier,conventionalDohertyarchitectures,adigitallydrivenDohertytechnique,andtheamplifierappliedtomicrowaveintegratedcircu
2、its.ByAndreiGrebennikov,SeniorMemberIEEEandSenadBulja,MemberIEEEABSTRACT
3、Inmodernwirelesscommunicationsystems,itistechniquesandChireixoutphasing[1],[2].Thisnewveryimportanttorealizesimultaneouslyhigh-efficiencyandtechniqueachievesplatecircuitefficienciesofupto60%–linearoperationof
4、poweramplifiers.Thispaper-overview65%independentofmodulationbymeansofacombineddescribesthehistoricalaspectoftheDohertyapproachtotheactionofthevariationofloaddistributionofthevacuumpower-amplifierdesignintroducedin1936andmoderntrendstubes,andthevariationofthecircuitimpedanceoverthe
5、inDohertyamplifier(DA)designtechniquesusingmultistagemodulationcycle.WhenDohertyjoinedtheradiodevel-andasymmetricmultiwayarchitectures.ToincreaseefficiencyopmentdepartmentoftheBellTelephoneLaboratoriesinoverthepowerbackoffrange,theswitchmodeclass-E,conven-June1929,hewasengagedinth
6、edevelopmentofhigh-tionalclass-F,orinverseclass-Foperationmodebycontrollingpowerradiotransmittersfortransoceanicradiotelephonythesecondandthirdharmonicscanbeusedintheloadnet-andbroadcasting.Asaresult,in1936,heinventedameanswork.TheDAwithaseries-connectedload,andinverted,push–togre
7、atlyimprovetheefficiencyofRFpoweramplifiers,pull,balanced,andparallelDohertyarchitecturesarealsoquicklytermedtheBDohertyamplifier[(DA).Itwasfirstdescribedanddiscussed.Finally,examplesofthelumpedDAusedina50-kWtransmitterwithaudio-frequencyfeedbackimplementedinmonolithicmicrowaveint
8、egratedcircuits,providingaresultingdistortionlevelfromlessthan1%atdigitallydrivenDohertytechnique,andbroadbandcapabilitylowerfrequenciestoafewpercentathighaudioofthetwo-stageDAaregiven.frequencies.Inthiscase,thepoweramplifierwasoperatedatanefficiencyof60%representingareductionofne
9、arlyKEYWORDS
10、Dohertyamplifier(DA)
