VFB与CFB比较1

VFB与CFB比较1MT-034TUTORIALCurrentFeedback(CFB)OpAmpsINTRODUCTIONInthistutorialthetwobasicopamptopologies―voltagefeedback(VFB)andcurrentfeedback(CFB)―arediscussedinmoredetail,andthedifferencesarepointedout.ThebasicvoltagefeedbackopampalongwithgainequationsisrepeatedhereinFigure1.VIN+A(s)=OPENLOOPGAIN