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1、ABSTRACTABSTRACTWiththedevelopmentofwirelesscommunicationtechnology,ThewirelesscommunicationsystembasedonSoftwareDefinedRadio(SCA)requirementswithmulti-band,multi-modecapabilityandsupportforhigh-speeddatacommunications.Tomeetthisrequirement,Thepoweramplifiermustbecapableofworkingonbroa
2、dbandspectrum,withsufficientlyhighlinearityandefficiencyspecifications.ThisarticleisabroadbandpoweramplifierdesignbasedonGaNHEMT,aimstosolvebroadband,highlinearityandhigh-efficiencyProblems.ThethirdgenerationofwidebandgapsemiconductorGaNHEMTwithahighpowerdensity,highmatchingimpedanceas
3、soonashighelectronmobilityadvantage,ItisanimportantPowersemiconductorsmaterialforthedevelopmentofhigh-efficiencycompactbroadbandlinearamplifier.ThispaperusesGaNHEMTtransistors,basedonGaNHEMTlarge-signalmodel,Accordingtotheoveralldesignspecifications,developedtheL-bandbroadbandpowerampl
4、ifier.Themainworkisasfollows:Firstly,Understandingthecurrentsituationandresearchdirectionsinthefieldofthebroadbandpoweramplifierdesign.ResearchingThebasicdesigntheoryofbroadbandpoweramplifier.includebasicdesignspecifications,large-signalnonlinearanalysismethod,CharacteristicsofMultiple
5、broadbandmatchingnetwork.Secondly,CompletetheoveralldesignandModulespecificationsdecomposition.ThenselectingCREEGaNHEMTtransistorandROGERSRO4350highfrequencyplatesasPCBplate.Consideringthesystemgain,outputpowerandlinearityspecifications,thefinalplancanbesummarizedasthreeamplifiercascad
6、e,Whichconsistsofapre-driverstage,HPF,driverandfinalstageamplifier.thefinalstageamplifierusesstructureofbalancedsynthesis,Itcanimprovetheoutputpowerandlinearityspecifications,Withbestoutputportreflectioncoefficient,Ensuretheoverallstabilityoftheamplifier.Third,thebroadbandmatchingcircu
7、itsaredesigned.In1-2GHzfrequencyrange,BroadbandMatchingnetworkstructureismultipleminormatchesandgradientline,Thatisthemulti-stepimpedancetransformerandInparalleledofOpenorshortmicrostripline.UsingGaNHEMTlarge-signalmodel,ContinuousoptimizationmatchingparametersinADSharmonicbalanceand
