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Applied Electronic Circuit

Applied Electronic Circuit. 생체의료공학과 2009103859 안흥기. Instrumentation Amplifier. A) 첫번째 단. B ) 두번째 단. + -. + -. + -. V O1 -V O2 = (2R 3 +R G ) i G = (1+2R 3 /R G )(V 1 -V 2 ). Instrumentation Amplifier. A) 첫번째 단 + B) 두번째 단. R i2 = 무한. 입력저항 : 매우큼 출력저항 : 매우작음

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Applied Electronic Circuit

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  1. Applied Electronic Circuit 생체의료공학과 2009103859 안흥기

  2. Instrumentation Amplifier A) 첫번째 단 B) 두번째 단 + - + - + - VO1-VO2 = (2R3+RG)iG = (1+2R3/RG)(V1-V2)

  3. Instrumentation Amplifier A) 첫번째 단 + B) 두번째 단 Ri2 = 무한 입력저항 : 매우큼 출력저항 : 매우작음 전압이득 : 가변가능 CMRR : 최대로 튜닝가능 + - + - + - RO = 무한 Ri2 = 무한

  4. I.A의 응용 1) 신호원이 멀때 잡음 Vs+VG Vs iG 차폐선 Ground Loop 도선의 저항 + - + VG- V1 + - + - 공기를통해 흐르는 전류(교류일때 발생) C1 C2 V1’ V2 V2’ Vs Stray Capacitance (V2-V1)/2 -> 쉴드생성 Vs

  5. I.A의 응용 *Balanced Transmission R1C1과 R2C2가 달라지면 V1’, V2’도 달라진다 V1 = V2이더라도 V1’ = V2’ 일수있다. Vo = ADM(V2-V1) + ADM(V2’-V1’) + {ACM(V2’+V1’)}/2 CMRR(원래의 CMRR이 무한대라고 가정했을때) 가능하면 짧고 굵은선써야함(R1과R2줄임) Rdm = |R1-R2| Ccm=(C1+C2)/2

  6. Lecture Note 6 -OVER- Thank you for your attention!

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