UNIVERSITY OF SCIENCE &TECHNOLOGY

Student workWesam izz-eldien.

Mahmoud hassona . Mahmoud alkhazendar.Mohammed alzini.Mohammed BamkhramhDr. Fadel alakwaa

CONTENT OF PRESENTATION Timing circuit of pulse oximeter.Sample and Hold circuit of pulse

oximeter.

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

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Timing circuitB/D

Timing circuitB/D

Timing circuitB/D

Timing circuitB/D

Timing circuitB/D

Timing circuitNAND

B/D

Sample and Hold Circuit.B/D

Op/Am

Sample and Hold Circuit

Signal come from timer

Signal come from timer

Signal come from current to

volt converter

Signal specific for IR absorption

Signal specific for Red absorption

B/D

Op/Am

FET

Op/AmSample and Hold circuitB/D

BAND PASS FILTERIt is compos of :-•Resistors.•Capacitors.•Op-am.

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Op/Am

Band Pass Filter.High pass filter.

From 0.5 HZ

B/D

Op/Am

How calculate the value of the resistors and capstans IN high pass filter-:

C1 = C2R1=1/(21/2 * π * C1* Frequency).R2=1/(21/2 *2 * π *C1*

Frequency).

B/D

BAND PASS FILTER.Low pass filter.

To 0.5 HZ

B/D

Op/Am

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).

B/D

Band pass filter.

0.5-5 HZ

B/D

Op/Am

AUTOMATIC GAIN CONTROL (AGC) CIRCUIT:

B/D

(AGC )circuit:• Theory and design.• AGC block diagram.• Components of an AGC

circuit.

B/D

(AGC )circuit:AGC Block diagram:

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(AGC )circuit:AGC’s ideal transfer function:

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(AGC )circuit:B/D

Op/Am

(AGC )circuit:B/D

OPERATIONAL AMPLIFIER:Back

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