放大电路公式

Vi/R1=Vo/(R1+R2) ==> 放大倍数G＝1+R2/R1   

 

 Vo/R2=(0-Vi)/R1 ==>反向放大倍数G=-R2/R1

V1-V2 = (Vin+ - Vin-)/Rg*(2R1+Rg)

V3+/Rs*(Rs+R2) = V2

Vo - (Vo-V3+)/Rs*(Rs+R2) = V1

V1 - V2 = Vo - (Vo-V3+)/R3*(Rs+R2) - V3+/Rs*(R2+Rs) = -Vo*R2/Rs

(Vin+ - Vin-)/Rg*(2R1+Rg) = -Vo*R2/Rs ==>G=Rs/R2*(1+2R1/Rg)