rf功率放大器.doc

------------------------------------------------------------------------------------------------ —————————————————————————————————————— RF 功率放大器 PONENTSLETTERS,,,DE CEMBER2004563 BehavioralModelingofRFPowerAmpli?ersBased onPrunedVolterraSeries AndingZhu,Member,IEEE,,Fellow,IEEE Abstract — Behavioralmodelingtechniquesprovideaconvenientandef?cient meanstopredictsystem-pl exityoffullcircuitsimulationorphysics-levelanalysisofnonlinearsystems,the rebysigni? essfullyappliedforradiofrequency(RF)powerampli? er(PA)behavioralmodeling,plexitytendstolimittheirapplic ationsto “ weakly ” andlongmemoryeffects,forexample,thegeneralVolterramodelinvolvesagr eatnumberofcoef?,weproposeanewsimpli?edVolterrase riesbasedmodelforRFpowerampli?ersbyemployinga “ near-diagonality ” pr uningalgorithmtoremovethecoef?cientswhichareverysmall,orelsenotsens itivetotheoutputerror,thereforedramaticallyre-plexityofthe behavioralmodel. ------------------------------------------------------------------------------------------------ —————————————————————————————————————— IndexTerms — Behavioralmodel,FIRdigital?lters,poweram-pli?er,Volterrase ries. structureofthemodelcanbesigni?cantlysimpli?ed,withoutsubstantiallyco ithhigher-ordernonlin-earitiesandlonger-termmemoryeffects. -tionII,wereviewtheb ackgroundofVolterraseriesbasedmod-,weintr oduceanewpruningalgorithmtoeffectivelyremoveredundantcoef?cientsof aPAmodel,-sioniscontai nedinSectionV. AtruncatedVolterraseriescanbeusedtorepresentawideclassoftime-invaria ntnonlinearsystemswithmemoryeffects. andConsider astheinputandoutputsignalsofapowerampli?er, whereiscarrierfrequency and -----------------------------------------------------