加州大学RF功放设计实例.ppt

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1、PowerAmplifierNonlinearityEstimationandPredistortionwithCorrelationTechniquesMingyuanLi,IanGalton,LarryLarson,PeterAsbeckUniversityofCalifornia,SanDiegoLaJolla,CA92093-0407OutlineNonlinearityextractioninfrequencyandtimedomainCorrelationtechniquesfornonlinearityestimationMathematic

2、alanalysisandsimulationresultsApplicationinadaptivepredistortionandmeasuredresultsSummaryandconclusionAM-AMandAM-PMnonlinearityMeasurementofIntersil’sISL3990DualBandPALookUpTablebehavioralmodelBehavioralmodelComplexpolynomialcurvefittingmodelSingletoneandtwo-tonepowersweepmeasurem

3、entGainandphasevsinputpowerGainandphasevaluesvsenvelopeamplituder(t)Pro:SimpletocharacterizeandanalyzenonlinearityCon:1.Notactualsignal2.Can’ttestduringnormaloperationconditionsIntermodulationsvsinputpowerPro:Actualsignal,testduringPAoperationCon:1.HighresolutionandspeedADC2.Large

4、memory3.ConsiderableDSPTime-domainCDMAenvelopetestGainvs.Pinusingtime-domaincaptureddataPhasevs.Pinusingtime-domaincaptureddataVout(red)vs.vin(blue)(a)realpart(b)imaginarypart(a)(b)AssessnonlinearityinadaptivepredistortionCorrelationtechniquesfornonlinearityestimationBasicideaNonl

5、inearitycomesfromoutputwith3rd,5th…orderdependencyoninput.Createtestsignalwhichalsohas3rd,5th…orderdependencyoninput.ExtractnonlinearitybypropercorrelationofoutputandtestsignalAdvantagesActualsignalinrealoperationconditionsLowhardwareandpowerconsumptionStestisuncorrelatedwithlinea

6、r(Vin)Stestiscorrelatedwithnonliear(Vin)DS-CDMA+XLOXPACorrelationPAnonlinearityS1S2S3StestStest=S1*S2*S3+1-1Vout=Linear(Vin)+Nonlinear(Vin)VinCorrelationmathematicalanalysisdominantStesttermsnonStesttermsaveragetozeroAssumptionsQuasi-memorylessPolynomialmodeltruncatedatthe5thorder

7、CorrelationApplicationtoIS-95forwardlinktransmitterIXIComplexpowerseriesanalysisRealcorrelationvalueImagcorrelationvaluePowercorrelationvaluePolynomialcoefficientsextractionbycorrelationComparisonofcorrelationwithothertechniquesConstructAM_AMandAM_PMusingpolynomialcoefficientsderi

8、vedbycorrelationsDifferentorderwi