1 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Applied Electronic Circuit 2010103778 강혜민.

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1 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Applied Electronic Circuit 강혜민

2 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Contents  Dual Op Amp IA  Shield Cable ( 차폐선 )  Transducer Bridge Amp  Conduction in Metal (Conductor)  RTD  Bridge Balancing

3 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Dual Op Amp IA

4 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield Cable ( 차폐선 ) 220v,60Hz Displacement Current Stray Capacitance (Interference 의 원인 ) CMRR 감소의 원인 Shield 로 Interference 를 제거한다.

5 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield Cable ( 차폐선 ) 도체 절연체 *Shield( 차폐 ) 전류 도체 220v,60Hz 내부엔 전류가 흐르지 않는다 Grounded Shield

6 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Shield Cable ( 차폐선 ) 220v,60Hz Stray Capacitor 의 접지까지의 거리가 짧아져 흐르는 전류가 더 많아지고 차동 이득이 더 커 지게 되는 좋지 않은 방법이다. Stray Capacitance 에 흐르는 전위차가 0 이다. Grounded Shield Active(Driven) Shield

7 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Transducer Bridge Amp Resistive Sensor -Temp : Thermistor, RTD -Light : Photo resistor -Strain : Strain Gage -Pressure : Piezo Resistor

8 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Conduction in Metal (Conductor) E E A L

9 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. RTD * 근사식이 아닌 식을 사용하면 근사식인 경우에 비해 0.26 ℃차이 발생 Self heating 발생

10 강혜민 Dept. of Biomed. Eng.BME303:Applied Electronic CircuitKyung Hee Univ. Bridge Balancing +2 개의 가변저항 2mA 1mA A