![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
电路如图 所示,假设运算放大器是理想的,则图( a ) A v = v O / v I = , R i = ;图( b ) A v = v O / v I = , R i = 。
A.
图( a ) A v = 11 , R i =1 kΩ ;图( b ) A v = 1 ; R i = ∞
B.
图( a ) A v = - 10 , R i =1 kΩ ;图( b ) A v = 1 ; R i = ∞
C.
图(a)Av = -10,Ri =1 kΩ;图(b)Av=1;Ri =1 kΩ
D.
图( a ) A v =11 , R i =1 kΩ ;图( b ) A v = 1 ; R i =1 kΩ