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JOURNALOFNEIJIANGNORMALUNIVERSITY248No.8Vol.24,3(,641112):,,.,,.:;;:O441:A:1671-1785(2009)08-0044-03.,[1].,.11.11.1H1(s)=U0Ui=-R1R211+sR1C1.(1)1.22.2Rx.H1()=-R1Rx1sR1C1,H2()=-1sR2C2,:G(s)=H1()H2()=R1/Rxs(sR1R2C1C2+R2C1).(2)(2),,,s,.,K=viv0=R6R5.3,:H2(s)=G(s)1-KG(s)=R1Rx1R1C11R2C2s2+s1R1C1+1R1C11R2C2R1RxR6R5.(3)443:2009206216:(:JG200604-81):(1979-),,,.:(1957-),,,.20098,:3P1,2=-12R1C114R22C21-R6R20s,.H2(s)=2ns2+s2n+2n,R5=R6,=R1Rx.Rx.,.,[2].22.14.4H4(s)=H2(s)H3(s)=R1Rx1R1C11R2C2s2+s1R1C1+1R1C11R2C2R1RxR6R5(-R3R411+sR3C3)=-R1R3RxR41R1R2R3C1C2C3s3+s2R3C3+R1C1R1C1+s1+R3C3R2R3RxC1C2C3+1R2R3RxC1C2C3.(4),,,[3].2.2ButterworthButterworth[4]:H4(s)=1s3+2s2+2s+1=1s+11s2+s+1(5)(4)(5),:R3C3+R1C1R1C1=2;1+R3C3R2R3RxC1C2C3=2;1R2R2RxC1C2C3=1;R1R3RxR41R1R2R3C1C2C3=1.R1C1=R3C3=1,R3=R4;RxR2C1C2=1.=R1Rx=12,Rx=4R1,R2C2=14.R1=R2=R3=R4=1,C1=C3=1F,C2=0125F.2.3Butterworth[5],F,F=(rad/s)1(rad/s).,Fc,.F,N.ZF,zF=1,ZF.:RN=R/ZF;:CN=ZFFC.,RN,CN,R,C.Butterworth:c=6280rad/s(fc=1000Hz),R1=R2=R3=R4=10k.:F=c(rad/s)1(rad/s)=6280rad/s1rd/s=6280;zF=10K1=10K.54248C1=C3=1F628010103=16nF,C2=0125F628010103=4nF.2.4,Multisim8Bodeplot2ter[6],,,,.R1=R2=R3=R4=1M,C1=C3=1F628010103=160pF,C2=0125628010103=40pF,5.53,,,,.:[1],,,.EWB[J].,2007,28(3):55257.[2].[J].,2001,17(2):54255.[3].[M].:,2003:53254.[4],.[J].,2005,19(2):22223.[5].[J].(),1994,22(4):31233.[6],.Multisim8RC[J].(),2005,18(4):25227.TheDesignandSimulationAnalysisofThree2PoleActiveLowPassFiltersMAYao2ting,SHAOYi2quan(SchoolofPhysicsandElectronicInformationEngineering,NeijiangNormalUniversity,Neijiang,Sichuan641112,China)Abstract:Inthispaper,athree2poleactivefilterisdesignedadoptingthesubsystemscascadingandnormalization.Thetransferfunctionofthesystemiscalculatedandtheprocessofselectingthecircuitparametersispresentedindetailsinthispa2per.Thecircuitissimulated.Itsprovedwithexperimentthatthree2poleactivefilterwithexcellentperformancecanbeac2quiredbyadjustingthevalueofresistanceandcapacitance.Keywords:three2poleactivefilter;transferfunction;amplitude2frequencyresponsecharacteristic(::)64