§31大电路的组咸与术指标x (3)电流放大倍数A (4)源电流放大倍数AAs- 2.输入阻抗R S R BACKNEXT(1-6) §3.1放大电路的组成与技术指标 (3)电流放大倍数Ai (4)源电流放大倍数Ais i o i I I A   = is o is I I A   = 2. 输入阻抗Ri i i i I U R   US ~ A = i I  Ui  RS