标签: vfb与cfb
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VFB与CFB比较2MT-058TUTORIALEffectsofFeedbackCapacitanceonVFBandCFBOpAmpsItisquitecommontouseacapacitorinthefeedbackloopofaVFBopamp,toshapethefrequencyresponseasinasimplesingle-polelowpassfiltershowninFigure1below.TheresultingnoisegainisplottedonaBodeplottoanalyzestabilityandphasemargin.Stabilityofthesystemisdeterminedbythenetslopeofthenoisegainandtheopen-loopgainwheretheyintersect.R1C2AR2……
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VFB与CFB比较1MT-034TUTORIALCurrentFeedback(CFB)OpAmpsINTRODUCTIONInthistutorialthetwobasicopamptopologies―voltagefeedback(VFB)andcurrentfeedback(CFB)―arediscussedinmoredetail,andthedifferencesarepointedout.ThebasicvoltagefeedbackopampalongwithgainequationsisrepeatedhereinFigure1.VIN+A(s)=OPENLOOPGAIN……
