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Applied Electronic Circuit

Applied Electronic Circuit. 2010103778 강혜 민. Contents. Dual Op Amp IA Shield Cable ( 차폐선 ) Transducer Bridge Amp Conduction in Metal (Conductor) RTD Bridge Balancing. Dual Op Amp IA. , 때 ) (Superposition) ( )

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Applied Electronic Circuit

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  1. Applied Electronic Circuit 2010103778 강혜민

  2. Contents • Dual Op Amp IA • Shield Cable (차폐선) • Transducer Bridge Amp • Conduction in Metal (Conductor) • RTD • Bridge Balancing

  3. Dual Op Amp IA , 때)(Superposition) () 입력시간이 달라서 time delay가 생김 → 시간에 따라 빠르게 변하는 고주파일 경우에 Phase Distortion이 발생한다. → 저주파용으로 사용한다.

  4. Shield Cable (차폐선) ++ ⇒CMRR = 20 220v,60Hz CMRR감소의 원인 Stray Capacitance (Interference의 원인) Displacement Current Shield로 Interference를 제거한다.

  5. Shield Cable (차폐선) 도체 *Shield(차폐) 도체 절연체 내부엔 전류가 흐르지 않는다 <Coaxial Cable> 220v,60Hz 전류 Grounded Shield <Triaxial Cable>

  6. Shield Cable (차폐선) 220v,60Hz Grounded Shield Active(Driven) Shield Stray Capacitance에 흐르는 전위차가 0이다. Stray Capacitor의 접지까지의 거리가 짧아져 흐르는 전류가 더 많아지고 차동 이득이 더 커지게 되는 좋지 않은 방법이다.

  7. Transducer Bridge Amp Resistive Sensor -Temp : Thermistor , RTD -Light : Photo resistor -Strain : Strain Gage -Pressure : Piezo Resistor

  8. Conduction in Metal (Conductor) E -F=-qE=ma - - 법칙) E T[s]동안 L[m]이동한다면, A L

  9. RTD If) 도) Self heating발생 *Self heating을 방지하기 위해 , choose ⇒최종적으로 0.1v/℃의 출력 (온도:0~100℃, ΔT=1℃일 때 Δ *근사식이 아닌 식을 사용하면 근사식인 경우에 비해 0.26℃차이 발생

  10. Bridge Balancing +2개의 가변저항 2mA A 1mA 전원:±0.05×15v = 0.75v변동 To be safe, 라 가정 , A점의 전압 = 14v(minimum) , 흐르는 전류: 2mA,=⇒14kΩ140Ω⇒280Ω의 변화To be safe, choose 영점조정 및 Full scale조정

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