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基于改进共源共栅电流镜的第三代电流传输器.docx

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基于改进共源共栅电流镜的第三代电流传输器 Introduction Thethirdgenerationofcurrentconveyors(CCIII)isanenhancedversionofthetraditionalcurrentconveyor,whichisusedtotransmitelectricalcurrentbetweentwoterminals.TheCCIIIisextensivelyutilizedinvariouselectroniccircuits,suchasfilters,oscillators,analog-to-digitalconverters,andinstrumentationamplifiers.Itispreferredoverothercurrentconveyorsduetoitshighoutputimpedance,lowvoltage,andlowpowerconsumption.TheCCIIIconsistsofseveralimprovedcurrentmirrors,current-modeamplifiers,andvoltage-controlledcurrentsources.Inthispaper,wewilldiscussthedesignandimplementationoftheCCIIIbasedonanenhancedcommonsourcecommongatecurrentmirror. EnhancedCommonSource-CommonGateCurrentMirror Acurrentmirrorisacircuitthatgeneratesareplicaofacurrentthatflowsthroughareferencenode.Thecurrentmirrorcanbeclassifiedintothreecategories,namely,thebipolarjunctiontransistor(BJT),themetal-oxide-semiconductorfield-effecttransistor(MOSFET),andthehybridcurrentmirror.Inthispaper,wewilluseanenhancedMOSFET-basedcurrentmirror. TheenhancedMOSFET-basedcurrentmirrorincludestwolegs,namely,thecommonsource(CS)andthecommongate(CG)legs.TheCSlegincludestwoMOSFETsconnectedinseries,andtheCGlegincludesasingleMOSFET.TheinputcurrentisinjectedintotheCGlegofthecurrentmirror,andareplicaofthecurrentisproducedattheoutputoftheCSleg. Figure1:EnhancedCS-CGcurrentmirror TheenhancedCS-CGcurrentmirrorovercomesthelimitationsofthetraditionalCS-CGcurrentmirrorbyaddinganegativefeedbackcircuit.Thenegativefeedbackcircuitensuresthattheoutputcurrentisproportionaltotheinputcurrent,therebyreducingtheeffectofvariationsintheMOSFETs’parameters.TheenhancedMOSFET-basedcurrentmirrorismoreaccurate,haslowerpowerconsumption,andlargeroutputresistancethanthetraditionalCS-CGcurrentmirror. DesignoftheCCIII TheCCIIIconsistsofthreestages;thecurrentbuffer,thebalancedamplifier,andtheoutputstage. ThecurrentbufferstageconsistsoftwoenhancedCS-CGcurrentmirrorsthatprovideanaccuratecopyoftheinputcurrent.TheenhancedCS-CGcurrentmirrors’outputsareconnect