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
B/D
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.
B/D
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:
B/D
(AGC )circuit:AGC’s ideal transfer function:
B/D
(AGC )circuit:B/D
Op/Am
(AGC )circuit:B/D
OPERATIONAL AMPLIFIER:Back
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