VFB与CFB比较2
VFB与CFB比较2MT-058TUTORIALEffectsofFeedbackCapacitanceonVFBandCFBOpAmpsItisquitecommontouseacapacitorinthefeedbackloopofaVFBopamp,toshapethefrequencyresponseasinasimplesingle-polelowpassfiltershowninFigure1below.TheresultingnoisegainisplottedonaBodeplottoanalyzestabilityandphasemargin.Stabilityofthesystemisdeterminedbythenetslopeofthenoisegainandtheopen-loopgainwheretheyintersect.R1C2AR2
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