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Chapter. 19

Chapter. 19. Negative Feedback. < Reference >. ⑴ 전압귀환  출력전압이 안정 ( 낮은 출력 임피던스 ) ⑵ 전류귀환  출력전류가 안정 ( 높은 출력 임피던스 ) ⑶ 비 반전 입력 구동  높은 입력 임피던스 ⑷ 반전 입력 구동  낮은 입력 임피던스. < Ideal Negative feedback >. 비반전구동. VCVS : Zin=∞ , Zout=0 , 출력전압 안정 ,

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Chapter. 19

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  1. Chapter. 19 Negative Feedback Mobile Communication Lab. (http://mobile pknu.ac.kr)

  2. < Reference > ⑴ 전압귀환  출력전압이 안정 ( 낮은 출력 임피던스 ) ⑵ 전류귀환  출력전류가 안정 ( 높은 출력 임피던스 ) ⑶ 비 반전 입력 구동  높은 입력 임피던스 ⑷ 반전 입력 구동  낮은 입력 임피던스 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  3. < Ideal Negative feedback > 비반전구동 • VCVS : Zin=∞ , Zout=0 , 출력전압 안정 , • ICVS : Zin=Zout=0 , transresistance Amp.(rm) , • VCIS : Zin=Zout=∞ , transconductance Amp.(gm) , • ICIS : Zin=0 , Zout=∞ , 전류이득 안정 , 반전구동 (입력전류원) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  4. V1 + AOL rin Vout Verror Vin V2 - R2 R1 V2 ⑴ VCVS • 入力 Imp. 大 • 出力 Imp. 小 • 전압이득 안정 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  5. Mobile Communication Lab. (http://mobile pknu.ac.kr)

  6. ※ 비선형 왜곡 ( Nonlinear distortion ) 배 감소 출력 offset voltage 감소 ※ Mobile Communication Lab. (http://mobile pknu.ac.kr)

  7. R2 R1 - Vout iin Vin + ⑵ ICVS R2 • 入力 Imp. 小 • 出力 Imp. 小 + - iin - + Vout AOL Verror - - iin + + ( The inverting Amp. ) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  8. (K.V.L) 전달저항 (Transresistance) (전류-전압 변환기) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  9. + - R2 ● B=1 • 전류원 (이상적으로 무한한 임피던스) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  10. - Vout + ※ ※ A rin(CL) rout(CL) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  11. 19-5 The VCIS V1 + Verror - V2 Vout + KVL V2 - Mobile Communication Lab. (http://mobile pknu.ac.kr)

  12. 入力 Imp. 大 • 出力 Imp. 大 • 전압-전류 변환기 • 안정한 전달 컨덕턴스 (K.V.L); Mobile Communication Lab. (http://mobile pknu.ac.kr)

  13. (Ref.) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  14. ※ 入力 Imp. Mobile Communication Lab. (http://mobile pknu.ac.kr)

  15. ※ 出力 Imp. ‥‥ ① ‥‥ ② ‥‥ ③ ②,③  ① 0 Thevenin 등가출력전압 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  16. R2 Zout Mobile Communication Lab. (http://mobile pknu.ac.kr)

  17. 19-6 The ICIS Amplifier + Verror - - - - iout + + - Vout iin iout-iin + (K.V.L) Mobile Communication Lab. (http://mobile pknu.ac.kr)

  18. ‥‥ ① ‥‥ ② Mobile Communication Lab. (http://mobile pknu.ac.kr)

  19. A >> 1 이므로 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  20. RF + - - RL RF + RL ※ Ref. • 반전 전압 귀환  출력전류와의 관계 • 전류 귀환 ※ ※ Mobile Communication Lab. (http://mobile pknu.ac.kr)

  21. 19-7 Bandwidth Mobile Communication Lab. (http://mobile pknu.ac.kr)

  22. 代入 개방루프 차단 주파수 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  23. ☆ Bandwidth and Slew-rate Distortion Mobile Communication Lab. (http://mobile pknu.ac.kr)

  24. + Vin rout Vout AVerror - R2 VF Voltage RL + R1 V2 - Mobile Communication Lab. (http://mobile pknu.ac.kr)

  25. 0 0 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  26. + Vin rout Vout AVerror - Iout-Iin R2 Iin + R1 Iout V2 - Mobile Communication Lab. (http://mobile pknu.ac.kr)

  27. 0 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  28. Mobile Communication Lab. (http://mobile pknu.ac.kr)

  29. + Vin - Iout R2 Iin≒0 + R1 Iout V2 - (+) 단자 Vin 이  (-) 단자 V2 로 boostrapping Mobile Communication Lab. (http://mobile pknu.ac.kr)

  30. 0 Mobile Communication Lab. (http://mobile pknu.ac.kr)

  31. R1 iout V2 - Vout + R2 Vin Mobile Communication Lab. (http://mobile pknu.ac.kr)

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