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1、HighFrequencyDesignFromMay2003HighFrequencyElectronicsCopyright©2003SummitTechnicalMedia,LLCRFPOWERAMPLIFIERSRFandMicrowavePowerAmplifierandTransmitterTechnologies—Part1ByFrederickH.Raab,PeterAsbeck,SteveCripps,PeterB.Kenington,ZoyaB.Popovic,NickPothecary,JohnF.SevicandNathanO
2、.SokalFandmicrowavelopetracking,outphasing,andDoherty.Withthisissue,webeginaRpoweramplifiersLinearitycanbeimprovedthroughtechniquesfour-partseriesofarticlesandtransmitterssuchasfeedback,feedforward,andpredistor-thatofferacomprehensiveareusedinawidevarietytion.Alsodiscussedares
3、omerecentdevelop-overviewofpoweramplifierofapplicationsincludingmentsthatmayfinduseinthenearfuture.technologies.Part1coverswirelesscommunication,Apoweramplifier(PA)isacircuitforcon-thekeytopicsofamplifierjamming,imaging,radar,vertingDCinputpowerintoasignificantlinearity,effici
4、encyandandRFheating.ThisamountofRF/microwaveoutputpower.InavailableRFpowerdevicesarticleprovidesanintro-mostcases,aPAisnotjustasmall-signalductionandhistoricalamplifierdrivenintosaturation.Thereexistsbackgroundforthesubject,andbeginstheagreatvarietyofdifferentpoweramplifiers,t
5、echnicaldiscussionwithmaterialonsignals,andmostemploytechniquesbeyondsimplelinearity,efficiency,andRF-powerdevices.Atlinearamplification.theend,thereisaconvenientsummaryoftheAtransmittercontainsoneormorepoweracronymsused—thiswillbeprovidedwithallamplifiers,aswellasancillarycir
6、cuitssuchasfourinstallments.Authoraffiliationsandcon-signalgenerators,frequencyconverters,mod-tactinformationarealsoprovidedattheendulators,signalprocessors,linearizers,andofeachpart.powersupplies.TheclassicarchitectureemploysprogressivelylargerPAstoboosta1.INTRODUCTIONlow-lev
7、elsignaltothedesiredoutputpower.ThegenerationofsignificantpoweratRFHowever,awidevarietyofdifferentarchitec-andmicrowavefrequenciesisrequirednotturesinessencedisassembleandthenonlyinwirelesscommunications,butalsoinreassemblethesignaltopermitamplificationapplicationssuchasjammin
8、g,imaging,RFwithhigherefficiencyandlinearity.heating,andminia
