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Lecture Note 6

Lecture Note 6. 2010103793 생체의공학과 변철 민. Contents. 차동 증폭기. Differential Amp. V 0 = (V 2 -V 1 ). Vdm =V2-V1 ->differential mode sg Vcm = (V2+V1) ->common-mode sg V1= Vcm- Vdm V2= Vcm + Vdm. R2(1-. -+. V cm. - +. V d m. R1. R2. -+. 차동 증폭기. Differential Amp.

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Lecture Note 6

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  1. Lecture Note6 2010103793 생체의공학과 변철민

  2. Contents

  3. 차동 증폭기 Differential Amp V0=(V2-V1) Vdm=V2-V1 ->differential mode sg Vcm=(V2+V1) ->common-mode sg V1=Vcm-Vdm V2=Vcm+Vdm R2(1- -+ Vcm - + Vdm R1 R2 -+

  4. 차동 증폭기 Differential Amp V0=(V2-V1) R1 V0=(V2-V1) R2 =>단점: 입력에서 부하효과 발생 - + RG 이득조절 R3 R2 R1 - +

  5. 7 U1 3 5 V1 V+ + OS2 Vo1 6 OUT 2 1 4 - OS1 R3 V- V1 RG V2 4 2 1 R3 V- - OS1 6 OUT 3 5 V2 7 + OS2 Vo2 V+ Instrumentation Amp 계측용 증폭기 1단 iG= 차동 입력-차동 출력 증폭기

  6. Instrumentation Amp 계측용 증폭기 2단

  7. Instrumentation Amp 계측용 증폭기 입력저항 매우 큼 출력저항 매우 작음 전압이득:가변가능 CMRR 최대 튜닝가능

  8. Instrumentation Amp 계측용 증폭기의 응용 해결 - + “Ground loop” Stray Capacitor 다르다 잡음 발생 Balanced Transmission

  9. Thank You!

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