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:2010-10-01:(2010JK889);;:(1961-),,,.284Vo.l28No.4201012NATURALSCIENCEJOURNALOFHAINANUNIVERSITYDec2010:1004-1729(2010)04-0327-05李安(,712046):CFTA,,:,.,,,,100kHz,0.5,:.:;;;:TN722.7+7:A,(CurrentDifferencingTransconductanceAmplifier,CDTA),[1-7].,,2CDTA,pn,,,,CDTA,(CurrentFollowerTransconductanceAmplifier,CFTA).CFTA[8-10],CFTA.[7],CDTACFTA,CFTA.,,,.,,,,.:.11CFTA.:1(a)CFTA,(b)CFTAVf=0,Iz=If,Ix=gmVz,(1)gm=IB2VT,(2),gmCFTA,VT,IB.CFTA,,CFTA,x-x.2.2(a)CFTA.2(a)I1=-Iz1=-Ix2=-gm2Iz2/sC=gm2Ix1/sC=gm1gm2V1/sC,Z1=V1/I1=sC/gm1gm2,,(2)Leq=4V2TC/IB1IB2.(3)2CFTA2(b)CFTA.gm1=gm2=gm,2(b):I1=-Iz1=-Ix3=-gm3Iz3/sC=-gm3(Ix2-Ix1)/sC=gm3gm(V1-V2)/sC,I2=-Iz2=Ix3=gm3Iz3/sC=-I1,Z12=(V1-V2)/I1=sC/gm3gm,,(2)Leq=4V2TC/IB3IB,(4)IB=IB1=IB2.22.1CFTA3LC,,RSRL,C1=C3=1F,L2=2H,RS=RL=1,.IoIi=12(s+1)(s2+s+1),(5)32820103LC,3,R=kzRN,L=kzoLN,C=CNkzo,(6),kz,o;RN,LN,CN;R,L,C.fo=100kHz,3,RS=RL=1031=1k,L2=1032/(2105)=3.185mH,C1=C3=1/(1032105)=1.592nF.3L22(b),CFTA,4.C=10nF,(4)L2IB1=IB2=IB3=92.1332A.(4)(6)fo=kzLN2L=kzLNIB8V2TCIB3,(7)IB=92.1332A,,IB3A,foIB3,IB3.4CFTA2.2CFTA5LC,RSRL,C2=0.5F,L1=L3=1H,RS=RL=1,.IoIi=s32(s+1)(s2+s+1),(8)5LC3294:6CFTAfo=100kHz,5,RS=RL=1031=1k,L1=L3=1031/(2105)=1.593mH,C2=0.5/(1032105)=0.7960nF.5L1,L32(a),CFTA,6.C=10nF,(4),L1,L3IB1=IB2=130.2853A.,(7),,.3,[8]CFTA,EWB5.0CFTA,NPNQNL,PNPQPL,2BF100,.,4.RS=RL=1k,C1=C3=1.592nF,C=10nF,CFTAIB1=IB2=IB3=92.1332A,fo=100kHz,Aup=0.5,7.EWB5.0fo=95.219kHz,Aup=0.4982.7CFTA8C=10nF,RS=RL=1k,C1=C3=1.592nF,IB1=IB2=92.1332A,IB3=23A,46A,69A,92A,,RS=RL=1k,C1=C3=1.592nF,C=10nF,3302010CFTAIB1=IB2=92.1332A.IB3=23A,46A,69A,92A,fo=25kHz,50kHz,75kHz,100kHz.8.EWB5.0:fo=26.569kHz,53.722kHz,76.568kHz,95.219kHz.,,.4CFTA,,.,:,,;,;,,,.,,.:[1]BIOLEKD,SENANIR,BIOLKOVAV,eta.lActiveelementsforanalogsignalprocessing:classification,review,andnewproposals[J].Radioengineeing,2008,17(4):15-32.[2]KESKINAU,BIOLEKD,HANCIOGLUE,eta.lCurrentmodeKHNfilteremployingcurrentdifferencingtransconductanceamplifier[J].AEUInternationalJournalofElectronicsandCommunications,2006,60(6):443-446.[3]LIYongan.ForthordercurrentmodebandpassfilterwithcoupledtunedbycurrentusingCCCDTAs[J/OL].JournalofElectronDevices,2010,7(1):210-213[2010-01-10].Http:[4].MOCDTA/[J].,2009,39(5):670-672.[5].MOCDTA[J].,2010,40(3):362-364.[6]LAHIRIA.Resistorlessmixedmodequadraturesinusoidaloscillator[J].InternationalJournalofComputerandElectricalEngineering,2010,2(1):63-66.[7]PRASADD,BHASKARDR,SINGHAK.Newgroundedandfloatingsimulatedinductancecircuitsusingcurrentdifferencingtransconductanceamplifiers[J].Radioengineeing,2010,19(1):194-198.[8]HERENCSARN,KOTONJ,VRBAK.Generalizeddesignmethodforvoltagecontrolledcurrentmodemultifunctionfilters[J].TelforJourna,l2009,1(2):49-52.[9]TANGSRIRATW.NovelcurrentmodeandvoltagemodeuniversalbiqudafiltersusingsingleCFTA[J].IndianJournalofEngineering&MaterialsSciences.2010,17(4):90-104.[10]HERENCSARN,KOTONJ,VRBAK,eta.lAnovelcurrentmodeSIMOtypeuniversalfilterusingCFTAs[J].ContemporaryEngineeringSciences,2009,2(2):59-66.NewActiveSimulationInductanceandItsApplicationsLIAn(DepartmentofElectronicsandInformationEngineering,ShanxiInstituteofInternationalTrade&Commerce,Xianyang712046,China)Abstract:BasedonCFTA,agroundedandafloatingsimulatedinductancecircuitswereproposed.Thecircuitsemployedgroundedcapacitor,minimumnumberofactivecomponentsanditsinputandoutputterminals.Toconfirmthereliabilityofthecircuits,basedoninductancecircuits,componentsubstitutionmethodwasusedtodesignButterworththirdorderlowpassandhighpassfilterrespectively,itsPolefrequencyfo=100kHzandpassbandgainAup=0.5.Thecomputersimulationresultsindicatedthattheproposedcircuitswerevalidandeffective.Keywords:Butterworththirdorderfilter;currentmodecircui;tsimulationinductance;currentfollowertransconductanceamplifier3314: