标签: biasing

MESFETAmplifierBiasingMESFETAmplifierBiasingAN-0002BiasingCircuitsandConsiderationsforGaAsMESFETPowerAmplifiersSummaryInordertoproperlyuseanyamplifieritisnecessarytoprovidethecorrectoperatingenvironment,especiallytheDCbias.ThisapplicationnoteoutlinessomeoftheconsiderationsforbiasingMESFETamplifiers.Itemsconsideredhereinare:Constantcurrentoperation,Temperaturecompensationofthebiasingnetwork,andPowersequencingoftheappliedvoltages.OverviewTheI-VcurvesofFigure1representatypicalMESFETdeviceinacommonsourceconfiguration.ForatypicaldeviceoperatinginClassAthedesiredcurrentis50%ofthemaximumcurrentforanyparticularpart.TypicalMESFETdevicesaredepletionmode,meaningthatthehighestdrain-sourcecurrentoccursfor……

AreconfigurableRFpoweramplifierbiasingschemeRegularSessionI:H$hFrequencyCircuits&TechniquesAReconfigurableRFPowerAmplifierBiasingSchemeNathalieDeltimple,EricKerhervP,YamDevalandPierreJarryIXLLaboratory,CNRSUMR5818,CNRSFR2648,ENSEIRB-BordeauxIUniversity,351coursdelaLiberation,33405TalenceCedex,France,e-mail:deltimole@ixl.fr.Abstract-Areconfigurablepoweramplifier(PA)isstudiedinthispaper,dedicatedtomulti-mode,multi-standardradiofrequencyfront-end(RFFE),fromalowcostapproach.Thereconfigurableamplifiertopologyispresented,madeupoftwostagesindependentlycontrollablebythebiasingschemeproposed-#hiehallowsthedynamicmodificationofthequiescentcurrentoftheRFtransistor,toadaptbothitslinearityanditsoutputpowerinordertofulfilldiffer……

AmonolithicSiPCS-CDMApoweramplifierwithanimpedance-controllablebiasingschemeTUE3F-4AMONOLITHICSIPCS-CDMAPOWERAMPLIFIERWITHANIMPEDANCE-CONTROLLABLEBIASINGSCHEMESifenLuoandTirdadSowlatiPhilipsResearch,BriarcliffManor,NewYork10530,USAAbstract-ThispaperforthefirsttimepresentsamonolithicSiPCS-CDMApoweramplifier(PA)capableofdelivering28.2dBmoutputpowerwith30%power-addedefficiency(PAE)and-45dBcadjacent-channel-powerratio(ACPR)at1.9GHzand3.6Vsupplyvoltage.ThePAimplementedina30GHzBiCMOSprocessincorporatesanovelimpedance-controllablebiasingschemetocontrolclassofoperationandbiasimpedanceoftheoutputstage.controllablebiasingschemeforthePAanditsadvantagesovertheconventionalonearepresentedinSection111.MeasuredresultsofthePAwiththeimpedancecontrollablebiasingscheme……