1 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. 응용전자회로 7 주차 우응제 교수님 김도윤 2012103822 김도윤 2012103824 김성민 2012103827 김재희 2012103847.

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Presentation transcript:

1 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. 응용전자회로 7 주차 우응제 교수님 김도윤 김도윤 김성민 김재희 이은주 이지은

2 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Instrumentation Amplifier Dual Op-Amp U1 OPAMP + - OUT U2 OPAMP + - OUT R1R2R3R4 0

3 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Instrumentation Amplifier Dual Op-Amp

4 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Instrumentation Amplifier Dual Op-Amp Dual Op-Amp 는 문제점이 발생한다. V1 은 2 개의 Op amp 를 거쳐 출력 된다. V2 는 1 개의 Op amp 를 거쳐 출력 된다. V1 은 V2 보다 Vo 에서 Time delay 크다. Phase distortion 생긴다. 고주파일 때 Phase distortion 많이 발생한다. >> 결과적으로 이 회로는 주로 저주파 용이다. Phase distortion 없애기 input signal 이 system 통과시간이 같아야 함. Phase 가 frequency 에 선형적이어 야 한다.

5 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Instrumentation Amplifier Dual Op-Amp 보완 회로 R

6 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Active Guard Drive OPAMP + - OUT Vs 0 C1 C2 RS1 RS2 0 C1: stray capacitance 발생 시킴

7 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Active Guard Drive >> 원래 발생하는 Differential Mode Signal >>C1 과 도선 내 저항 때문에 생긴 Common Mode Signal 이 Differential Mode Signal 로 나타난 것 => CMRR 줄임 !!

8 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield( 차폐 ) << 결과적으로 CMRR 을 키우려면 R 과 C 가 줄어야 한다. R 은 단면적 넓히기, 비저항 높이기 C 는 차폐를 이용 단선 Shield 단면 절연체 도체 도선 Coaixial cable & 단선 shield Triaxial cable 여러선 Shield

9 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield( 차폐 ) 차폐를 지나는 경로 Stray capacitance Ground 를 기준 모든 전원에서 Stray capacitance 를 타고 들어오는 i 가 Shield 안으로 들어가지 못함 Ground Shield

10 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield( 차폐 ) Ground Shield 일 때 OPAMP + - OUT Vs 0 C1 C2 RS1 RS2 Stray Capacitance 와 Ground 사이 distance 작아져 흐르는 i 가 더 커지고 common mode signal gain 이 더 커짐

11 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield( 차폐 ) Active(Driven) Shield 일 때 도선의 V = shield 의 V => 내부전위차 = 0 이므로 i 가 흐르지 않음

12 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Bridge Amp V1V1V2V2 Difference Amp 일 경우에는 Loading effect 발생한다 DC, AC 모두 가능 >> Capacitive Sensor >> Inductive Sensor

13 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Bridge Amp

14 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Conduction in Metal (Conductor)

15 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Conduction in Metal (Conductor) 원자는 상온의 열 E 때문에 진동 자유전자 자유롭게 이동 전기가 흐르면 전류의 반대방향으로 전자 이동

16 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Resistance Deviation

17 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Bridge I_RTD I V1V1V2V2

18 김도윤 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Bridge