Transcription of Demystifying the Operational Transconductance Amplifier ...
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Demystifying the Operational Transconductance Amplifier ...
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).
Regardless of how it is illustrated or defined, the OTA has a high impedance terminal (B); a low impedance terminal (E) that can be considered either as an input or an output depending on the circuit; and a output current source terminal (C). The output current source terminal is high impedance. Looking
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