2.T型反馈网络 虚短、虚断 R R O R A h=1 R R2 R3=-R2l=--7 R R 如果要求放大倍数100, 3、0-Vk_R2V R1=R2=R4=100K,R3=1.01k R3R3 RI R2+R4R2∥R4 (1+ R1 R3 R3-414Vi - + A R2 R4 Vo If ↓ R1 Ii → Id → I4 ↑ R3 I3 ↑ R' 2. T型反馈网络 _ = = 0 = V V + Ii If 虚短、虚断 o Vi R R R R R R V ) // (1+ + = - 3 2 4 1 2 4 R1 V I I i i = f = R f Vi R R V R I 1 2 3 = − 2 = − 3 1 2 3 3 3 0 R V R R R V I R i =  − = 如果要求放大倍数100， R1=R2=R4=100K，R3=1.01K 3 4 R4 V =V -I o R