vo=Anv=A30(-vr)输入串联时 vo=Ali=A(-in)输入并联时 Vo =iR+yso=iRo -Aov=io- Aso Bvo 得 R 1+A.B 电压串联反馈时: R R 1+A3B 电压并联反馈时:R1+ABs R( ) s o vo d vso f v = A v = A −v 输入串联时 ( ) s o r o d rso f v = A i = A −i 输入并联时 o o o s o o o s o f o Ro As oBvo v = i R + v = i R − A v = i − 得： A B R i v R s o o o o of + = = 1 电压串联反馈时： vso v o of A B R R + = 1 电压并联反馈时： rso g o of A B R R + = 1