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Biomedical Instrumentation

Biomedical Instrumentation. Report 7 2010103819 최법경. Contents. Bio-potential A mplifier Design Design signal range Power and devises Stray capacitance Design circuit with IA A part B part C part D part. Bio-potential Amplifier Design. Design signal range BW : 0.05 – 100Hz

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Biomedical Instrumentation

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  1. Biomedical Instrumentation Report 7 2010103819 최법경

  2. Contents • Bio-potential Amplifier Design • Design signal range • Power and devises • Stray capacitance • Design circuit with IA • A part • B part • C part • D part

  3. Bio-potential Amplifier Design • Design signal range • BW : 0.05 – 100Hz • 신호의 주파수 성분이 0.05 – 100Hz따라서 나머지 주파수 성분은 필요없다는 것을 알 수 있다. • DC contact potential : 300mV • Ag/AgCl의 DC contact potential은100mV 이지만 최악의 경우를 생각해넉넉하게 잡는다 • Contact impedance : 10kΩ • 피부의 Contact impedance를 줄이려면 각질을 제거한다.따라서 일반적인 경우를 생각해 넉넉하게 잡는다. 5mV range

  4. Bio-potential Amplifier Design • Power and devises • ADC 입력범위 : 5V • Power supply : 9V • Op amp : 6V 에서 포화 전원 및 소자는 이런 범위에서 전원을 공급하고 입출력을 받는다고 하자.

  5. Bio-potential Amplifier Design • Stray capacitance • 부유 용량이라고도 하고 Parasitic capacitance(기생 용량) 이라고도 한다.이번 회로 디자인에서는 공기와 사람 사이부유 용량이 문제가 된다. 그림과같이 원래 보기에는 커페시터가보이지 않지만 도선과 도선 사이에 자그마한 커페시터가 존재하는 것 처럼 작동하는 것그 커페시터를 부유용량이라고 한다.

  6. Bio-potential Amplifier Design • Design circuit with IA LA + Vi - RA RL

  7. Bio-potential Amplifier Design • Design circuit with IA • 참고 motion artifact

  8. Bio-potential Amplifier Design • Design circuit with IA • 전체 회로도

  9. Bio-potential Amplifier Design • A part 305mV 300mV

  10. Bio-potential Amplifier Design • B part (Differential Amp) • Dc offset이 함께 증폭된다는 문제점 발생여기서 이득율이낮은게CMRR이 커진다. 4.575mV 4.5mV

  11. Bio-potential Amplifier Design • C part (High pass filter) • 차단 주파수 75mV

  12. Bio-potential Amplifier Design • D part (Non-inverting amp with low pass filter) 5V

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