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题 4 － 11 A ：差动放大：无反馈 共模放大：电流串联负反馈，反馈元件 :R 3 ,R 6 ,R 7 ,T 3 B ：电压并联正反馈，反馈元件 R 3 ,R 4

P 332 题 4 － 9 （ a ）电流并联负反馈，反馈元件 R 3 （ b ）电压并联直流负反馈，反馈元件 R 2 、 R 3 、 C （ C ）电压并联负反馈，反馈元件 R 2 ,A 2 (D) 电流串联负反馈，反馈元件 R 6 （ E ）电压并联正反馈，反馈元件 A 2 ,R 2 （ F) 电压串联负反馈，反馈元件 R 4 ,R 5.

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题 4 － 11 A ：差动放大：无反馈 共模放大：电流串联负反馈，反馈元件 :R 3 ,R 6 ,R 7 ,T 3 B ：电压并联正反馈，反馈元件 R 3 ,R 4

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  1. P332 题4－9（a）电流并联负反馈，反馈元件R3（b）电压并联直流负反馈，反馈元件 R2、R3、C（C）电压并联负反馈，反馈元件R2,A2(D) 电流串联负反馈，反馈元件R6（E）电压并联正反馈，反馈元件A2,R2（F) 电压串联负反馈，反馈元件R4,R5

  2. 题4－10A：电流串联负反馈，反馈元件R3B：电压串联负反馈，反馈元件R3C：电压并联负反馈，反馈元件R2D：电压并联正反馈，反馈元件R3,R5E：电流并联交流正反馈， 反馈元件R3,R5,C2F：电流串联负反馈，R3,R4,R9

  3. 题4－11 A：差动放大：无反馈 共模放大：电流串联负反馈，反馈元件:R3,R6,R7,T3 B：电压并联正反馈，反馈元件R3,R4

  4. 题4－14 A:

  5. 14--C: A2为电压跟随器

  6. 14--F:

  7. 题4－15 A:

  8. 题4－15 C: If=(0-Vo)/R2=-Vo/R2 Fiu=-1/R2 Auif=1/F=-R2 Auf= Auif/R1=-R2/R1

  9. 题4－15 F

  10. 题4－16 为了稳定Au、减小Ro，加电压并联负反馈，Rf从输出端到反相端 (同相端1K电阻左端接地）。 Auf =20, 则Rf=20K 也可加电压串联负反馈。

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