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28620056()JOURNALOFHEFEIUNIVERSITYOFTECHNOLOGYVol.28No.6Jun.2005:2004208218;:2004210214:(1973-),,,;(1939-),,,,.S,,(,230009):S,,SI2V:ADS,SS2P;I2V,;,;,:;;S;I2V;:TN925.92;TN957.5:A:100325060(2005)0620588204Designmethodofmicrowavepoweramplifierwithsmall-signalSparametersZHENGJian2bin,MENGQing2nai,WEIQi2fu(SchoolofComputerandInformation,HefeiUniversityofTechnology,Hefei230009,China)Abstract:Thedesignofmicrowavepoweramplifierneedslarge2signalSparameters,butundermostcircumstances,thedesigneronlyhassmall2signalSparametersandthestaticI2Vcurve.Inthispaper,adesigningmethodispresentedtodealwiththisconditions.Firstly,bymeansoftheADSsoftware,thesmall2signalSparametersofthepoweramplifierareutilizedtomakethefileofS2Pfortheuseofthesimulationcircuits.Secondly,theloadimpedanceiscalculatedthroughthestaticI2Vcurveandthenmatchedconjugatelytotheoutputcircuitsbyusingtheoptimizationfunctioninthesoftware.Theinputimpedanceismatchedconjugatelytothesourceimpedanceaccordingtothemaximizationgain.Finally,thewholecircuitsareoptimizedtocompletethedesignofthecircuits.Keywords:largesignal;smallsignal;Sparameters;I2Vcurve;conjugatematch,,MESFET4:(1),,[1](2),,,,(3),,,(4)S:,FETI2V,,,CADADS(AdvancedDesignSystem)Windows,,,SmithADS,,ADS,Protel99[2],FUJITSUFLL120MK1(1)MESFETI2V,RL,11I2V,A,,1,,2,I2V,RL=2(Vb-Vs)ImaxImax=1.2Idss(),Vs,2V;Vb;IdssPout=Imax(Vb-Vs)ö4,,,,,FLL120MKI2V,,Vbias=10V;Vs=1.8V;Idss=4ARL=2(Vbias-Vs)1.2Idss=3.42(8)(2),,,,RLCdsCds,0.10PF,MESFET,RL,,CdsS,(MMIC),,,,22,,,()(EM)SGaAsMESFET9856,:S,[3],,RL,S,,RL,RL,ADSADSamodelB_priundermw_cktsMESFET[4]2HPöEESOFADS,ADSS,S,,S,34,,,A(Idssö2,Vds=8V),GaAsMESFETW(mm),:Cgs=1.0pFömm;Cgd=0.04pFömm;Rin=4.18ömm;Rds=1848ömm;Cds=0.20pFömm;Gm=0.082Sömm,,,,,3,12,SS2P;341234S,ADS,S,4,ADS,,,3142(3),,,CdsRLLsRsSS11,[5],ADS552,,#in=#3s#in=S11+S12S21#L1-#LS22,#L5;#s;#in[6]095()283,SS2P,,:,508,MESFET,;[7]ADSFLL120MK,K,ADS,,,,,;,,,,,,,66,6,2,,S(S22),,,,4S,SI2V,,1dB,MESFET[8]:(1)P21dBPsat1dB(2)IP3P21dB1012dB[][1],,.[M].:,1982.108-116.[2].[M].:,1976.89-99.[3].CAACAD[M].:,2003.13-26.[4].[M].:,1972.198-212.[5].Protel99[M].:,2003.178-196.[6].[M].:,2004.20-210.[7]VuoleviJHK,RahkonenT.ExtractionofanonlinearACFETmodelusingsmall2signalS2parameters[J].IEEETransactionsOnMicrowaveTheoryandTechniques,2002,50(5):1311-1315.[8]QuentserngH,SokolovV,MackseyHM,etal.MicrowavepowerGaAsFETamplifier[J].IEEETransactionsonMicrowaveTheoryandTechniques,1976,24(12):936-942.()1956,:S