NXP-Doherty-PA-Using-AWR

3WayDohertyAmplifierDesignJuly2011COMPANYCONFIDENTIALContentsAboutNXPRFpower.3WayDohertyAmplifierDesignTheory3WayDohertyAmplifierexample.3WayDohertyAmplifiersimulation.JohnGajadharsingCOMPANYCONFIDENTIALAboutNXPRFpowerJohnGajadharsingCOMPANYCONFIDENTIALNXPRFPowerinaSnapshotJohnGajadharsingCOMPANYCONFIDENTIALNXPLDMOSLeadershipCurrentportfolioinBICLDMOSGeneration6LDMOSGeneration7pushestheperformancefurther–20%higherpowerdensity–10%loweroutputcapacitance–25%lowerRth–2%higherefficiency–Lowmemoryeffect–VerygoodpredistortabilityHighVoltageLDMOSGeneration6(50V)–EnablesbestUHF&multipurposedevicesupto1.5GHz–ExcellentRuggedness–HighefficiencyGen8onthedrawingtable–Po-peak59dBm(Doherty)–PA-Eff50%(Doherty)–VBW=100MHz–OptimizedforDohertyandETDohertydemonstrators(customerenabling,customerusesNXPasdesignreference)NXPBringsGaNTechnologyMainstreamJohnGajadharsingCOMPANYCONFIDENTIAL3WayDohertyAmplifierDesignTheoryJohnGajadharsingCOMPANYCONFIDENTIAL7/20/2011700.20.40.60.81020406080100012345VRF/VddEff[%]SignalPDFEfficiencywithaFixedLoad-LineForafixedload-linemaximumefficiencyisonlyattainedifthevoltageamplitudereachesitsmaximumvalue.Theinstantaneousefficiencydropsproportionallywhenbackedoff.Formodulatedsignaltheaverageefficiencydependsonthesignalstatistics(PDF).InstantaneousEfficiencyAverageEfficiencyRayleighPDFClass-BddRFVV4avgbackoffinst@inst581114172001020304050PAR,BackoffEff[%]JohnGajadharsingCOMPANYCONFIDENTIALJuly20,2011Subject/Department/Author-87/20/2011800.20.40.60.81020406080100012345VRF/VddEff[%]SignalPDFEfficiencywithaFixedLoad-LineForafixedload-linemaximumefficiencyisonlyattainedifthevoltageamplitudereachesitsmaximumvalue.Theinstantaneousefficiencydropsproportionallywhenbackedoff.Formodulatedsignaltheaverageefficiencydependsonthesignalstatistics(PDF).InstantaneousEfficiencyRayleighPDFClass-BddRFVV4inst581114172001020304050PAR,BackoffEff[%]AverageEfficiencyavgbackoffinst@JohnGajadharsingCOMPANYCONFIDENTIAL7/20/20119EfficiencyEnhancementConceptsLoad-lineModulationSupplyModulationIftheload-lineadaptstothecurrentamplitude,maximumvoltageswingismaintainedandthereforemaximumefficiency.Ifthedrainsupplyadaptstothevoltageamplitude,maximumvoltageswingismaintainedandthereforemaximumefficiency.44JohnGajadharsingCOMPANYCONFIDENTIAL10EfficiencyEnhancementConceptsTheoreticalefficiencybehavioroftheconcepts.78Efficiency(%)Power(dBm)EER/ETLINC/OutphasingDohertyClass-BJohnGajadharsingCOMPANYCONFIDENTIAL7/20/201111ScalingtheTwo-wayDohertySolution4/,0ZRmIpjIImpedanceInverterpVpZmZoImVpTwo-wayDoherty,01ZLRmI1pjI1pV1oImV,02Z2pI2pV2oIpq4/4/ConventionalThree-wayDohertyJohnGajadharsingCOMPANYCONFIDENTIAL12TheConventionalThree-wayDohertySolution,01ZLRmI1pjI1pV1oImV,02Z2pI2pV2oIpq4/4/mZJohnGajadharsingCOMPANYCONFIDENTIAL13TheConventionalThree-wayDohertySolution,01ZLRmI1pjI1pV1oImV,02Z2pI2pV2oIpq4/4/mZImpedanceispulleddownduetoPeak1ImpedanceispulledupduetoPeak2JohnGajadharsingCOMPANYCONFIDENTIAL7/20/201114AnalysisofaConventionalThree-wayDohertyPAAMixed-SignalApproachTowardsLinearandEfficientN-WayDohertyAmplifiersW.C.EdmundNeo,StudentMember,IEEE,JawadQureshi,StudentMember,IEEE,MarcoJ.Pelk,StudentMember,IEEE,JohnR.Gajadharsing,Member,IEEEandLeoC.N.deVreede,SeniorMember,IEEEIEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.55,NO.5,MAY2007JohnGajadharsingCOMPANYCONFIDENTIAL7/20/2011157/20/2011max_2max_1max_max_1max_1max_1max_max_22112121max_2max_1max_21:ascalculatedbecanandpointsoff-backthegivenareamplifierpeaksecondandpeakfirstmain,theofcapabilitypowermaximumtheIf1:1::::thenisescapabilitipowermaximumofratioThevalue.maximumreachesefficiencytheepointwheroff-backsecondandfirstespecifythtoisDohertyway-threealconventiontheofdesignstartthewaytoOneppmpmpmmppmPPPPPkPPPkkkkkkkkPPPkk:givenarestransistoroflevelspowerMaximum:definedarepointsefficiencyMaximumDesignProcedureConventional3WD(1)JohnGajadharsingCOMPANYCONFIDENTIAL7/20/2011167/20/20112112121210222101021p2F)p1FmF01111:ascalculatedbecanand,andforvaluesselectedWiththepower.fullatamplifiersZpeaksecondandZpeakfirst,ZmainfortheimpedancesloadthechoosetoneedsdesignerthelinessmissionouputtrantheofimpedancesticcharacterithedeterminetoablebeTokkVSWRkZRkkkZZZkkZZZRZkkZFpLFpFpFpmFLxxPAmaintheof(VSWR)factormodulationLoadlinecombinertheofimpedancessticCharacteriDesignProcedureConventional3WD(2)JohnGajadharsingCOMPANYCONFIDENTIAL7/20/2011177/20/201117PrototypeConventional3WD(1:3:4)25Ohm25,41,2121LRkk°90/43.3Ω25Ω°90/86.6ΩMain1Peak2Peak°180/50°90/50Input134dB1XdB2XdB3XdBOPBOdBOPBOOPBO12@6@1500@50dBOPBOdBOPBOOPBO12@6@0@50dBOPBOdBOPBOOPBO12@1006@500@50JohnGajadharsingCOMPANYCONFIDENTIAL7/20/2011187/20/2011Conventional3WDDesignsExamplesPmainPpeak1PPeak210log(k22)10log(k12)Z01OhmZ02OhmRLNote1VSWR_maink1=1/2,k2=1/4134-12dB-6dB86.643.3252k1=4/7,k2=1/4133-12dB-4.9dB86.637.521.42.3k1=3/5,k2=1/3122-9.5dB-4.4dB70.733.3201.8k1=2/3,k2=1/2111-6dB-3.5dB502516.71.335021LpLpmLRRRNote1:fora50Ohmmatchaqu