(2)同相比例运算放大器 b+ =0 F F u-u+=u 0 0 Ir lo -li li P R F R f Rp=R//R F F A.=1+ R u (1+川u f R5 (2) 同相比例运算放大器 u-= u+= ui ib+ =0 ib- =0 _ +  +  RF Rf RP ui uo iF i f Au=1+ RF Rf iF=i f RP=Rf//RF 1 i 2 o i R u R u u = − F f i 1 2 o )u R R u = (1+ F f )