(资料图)
差分放大器
电路传递函数为:
V+=(V1-Vref)R2/(R1+R2)+Vref
V-=(Vout-V2)R1/(R1+R2)+V2
V+=V-
(V1-Vref)R2/(R1+R2)+Vref(R1+R2)/(R1+R2)=(Vout-V2)R1/(R1+R2)+V2(R1+R2)/(R1+R2)
(V1-Vref)R2/(R1+R2)+Vref(R1+R2)/(R1+R2)=(Vout*R1-V2*R1+V2*R1+V2*R2)/(R1+R2)
V1*R2-Vref*R2+Vref*R1+Vref*R2=Vout*R1+V2*R2
Vout*R1=V1*R2+Vref*R1-V2*R2
Vout=(V1-V2)R2/R1+Vref
