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Demystifying the Operational Transconductance …

1 SBOA117A May 2009 RevisedApril2013 SubmitDocumentationFeedbackCopyright 2009 2013,TexasInstrumentsIncorporatedDemysti fyingthe OperationalTransconductanceAmplifierAll trademarksare the propertyof May 2009 RevisedApril2013 Demystifyingthe (OTAs) ,thesedevicesservea veryusefulfunctionthat is beingimplementedon a regularbasisin manyintegratedcircuitsas an elementfor moreadvancedpurposes;the currentfeedbackamplifieris amongthe purposeof this applicationreportis to showhow also developsseveralexamplesof how this typeof componentcan be put togooduse for of an of Figures1 TypicalOTAE lementsand the (CC Type2) with the the versatilebuildingblocksthat intrinsicallyofferwidebandwidthfor manytypesof ,or voltage-controlledcurrentsource,can be viewedas an the transistormodel,ithas threeterminals:a high inputimpedance(base,orB); a low-impedanceinput/output(emitter,orE);a nd a currentoutput(collector,orC).

3 B 2 E C 8 V I OPA861 100 W R E R L V O Noninverting Gain V = 0VOS Transconductor (used here) C B E Diamond Transistor 3 2 1 V IN2 IOUT V IN1 Voltage-Controlled Current Source IOUT V IN2 V IN1 Z CCII+ Current Conveyor II+

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