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例2:如图电路,求AR 解: R R3 R2 r2 2R2 2R 02 =2V R 2 A l=12.1 r2 R R R1-R2 iIIR R RrI ;R1R2 A Ri R 1 RI-RVi - + A1 R3 Vo I2 ↓ R1 Ii → - + A2 2R2 R3 R2 I ↓ 1 Vo2 例2: 如图电路,求Avf,Ri 解: Ri 1 2 1 2 R R R R I V R i i i − = = 2 3 R R Avf = − i i i i V R R R R R V R V I I I 2 1 1 - 2 2 1 2 - 1 - = = = o Vi R R V 2 3 = - o Vo Vi R R V = 2 2 = - 3 2 2
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