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Applied Electronic Circuit #5

Applied Electronic Circuit #5. Howland Current Pump, Difference Amp, Resister Mismatch. 제출일 : 2014. 04. 28. 생체의공학과 2010103789 박 준 환. 1. Howland Current Pump. * 이므 로 → Voltage Compliance 가 크다 . +. -. Grounded Load V-I converter(Single-ended Current source)

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Applied Electronic Circuit #5

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  1. Applied Electronic Circuit #5 Howland Current Pump, Difference Amp, Resister Mismatch 제출일 : 2014. 04. 28. 생체의공학과 2010103789 박 준 환

  2. 1. Howland Current Pump * 이므로 → Voltage Compliance가 크다. + - • Grounded Load V-I converter(Single-ended Current source) • - Howland Current Pump I가 모두 Load에게 → 저항 ∞ + - NIC LOAD 신호원

  3. 1. Howland Current Pump * Balanced Current Source - R2를 작은 값으로 사용

  4. 1. Howland Current Pump * 정전류 전기 자극기

  5. Resister Matching(저항의 오차를 생각해서 다시 분석) • - → 최대오차 , (무한이 아니다) • 오차를 줄이는 방법 1. Howland Current Pump 방법 2. 가변저항 사용 방법 1. 정밀저항 사용(0.1% 저항) 예) 10k옴, p=0.001, = 0.004 *사용한 저항의 오차 확인이 반드시 필요

  6. 어떻게 저항 조절이 잘 되었는지 알 수 있을까? 1. Howland Current Pump Mismatch - Ro : 유한, A ≠ 0 Match - Ro : 무한, A = 0 조절 A 실험적으로 저항을 Matching 시켜주어야 한다. - 대량생산에 불리(∵생산성↓)

  7. (Differential Mode Signal) (Common Mode Signal) - - 2. Difference Amp 등가회로

  8. 3. Resister Mismatch – use superposition * : Differential Mode Gain * : Common Mode Gain DC 전압이 생김

  9. CMRR(Common Mode Rejection Ratio) 3. Resister Mismatch – use superposition • Resister tuning ( 정밀저항 사용, 가변저항 사용) 을 동일하게 인가하였을 때 출력전압이 0으로 나와야 한다.

  10. 일 때 3. Resister Mismatch – use superposition • 1% 저항 사용

  11. 감사합니다.

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