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UNIVERSITY OF SCIENCE &TECHNOLOGY

UNIVERSITY OF SCIENCE &TECHNOLOGY. Student work Wesam izz-eldien. Mahmoud hassona. Mahmoud alkhazendar. Mohammed alzini. Mohammed Bamkhramh Dr. Fadel alakwaa. B/D. CONTENT OF PRESENTATION. Timing circuit of pulse oximeter. Sample and Hold circuit of pulse oximeter. . B/D.

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UNIVERSITY OF SCIENCE &TECHNOLOGY

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  1. UNIVERSITY OF SCIENCE &TECHNOLOGY Student work Wesam izz-eldien. Mahmoud hassona. Mahmoud alkhazendar. Mohammed alzini. Mohammed Bamkhramh Dr. Fadel alakwaa

  2. B/D CONTENT OF PRESENTATION • Timing circuit of pulse oximeter. • Sample and Hold circuit of pulse oximeter.

  3. B/D Timing circuit (NE/SA/SE555/SE555C) the pin connections are as follows • Ground. • Trigger input. • Output. • Reset input. • Control voltage. • Threshhold input • Discharge. • +Vcc. +5 to +15 volt

  4. B/D Timing circuit

  5. B/D Timing circuit

  6. B/D Timing circuit

  7. B/D Timing circuit

  8. B/D Timing circuit

  9. B/D Timing circuit NAND

  10. B/D Sample and Hold Circuit. Op/Am

  11. B/D Sample and Hold Circuit Op/Am Signal come from timer Signal specific for IR absorption Signal come from current to volt converter Signal specific for Red absorption FET Signal come from timer

  12. B/D Sample and Hold circuit Op/Am

  13. B/D BAND PASS FILTER Op/Am • It is compos of :- • Resistors. • Capacitors. • Op-am.

  14. B/D Band Pass Filter. Op/Am • High pass filter. From 0.5 HZ

  15. B/D How calculate the value of the resistors and capstans IN high pass filter:- • C1 = C2 • R1=1/(21/2 *π* C1* Frequency). • R2=1/(21/2 *2 * π *C1* Frequency).

  16. B/D Band Pass Filter. Op/Am Low pass filter. To 0.5 HZ

  17. B/D How calculate the value of the resistors and capstans to low pass filter:- • Pick C1: __________ • Calculate C2 = C1 * 2: __________ • Calculate R1 and R2 =1/( 2 * 21/2 * π *C1*Frequency).

  18. B/D Band pass filter. Op/Am 0.5-5 HZ

  19. B/D Automatic Gain Control (AGC) circuit:

  20. B/D (AGC) circuit: • Theory and design. • AGC block diagram. • Components of an AGC circuit.

  21. B/D (AGC) circuit: AGC Block diagram:

  22. B/D (AGC) circuit: AGC’s ideal transfer function:

  23. B/D (AGC) circuit: Op/Am

  24. B/D (AGC) circuit:

  25. Back OPERATIONAL AMPLIFIER:

  26. Back

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