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UNIT 3
APPLICATIONS OF OP AMP
Mr. C. KARTHIKEYAN ,
ASSISTANT PROFESSOR,
ECE,RMKCET
PEAK DETECTOR
CIRCUIT DIAGRAM – PEAK DETECTOR
OPERATION:
CASE 1
V in >> V c
D –FB
Voltage follower
CASE 2
V in << V c
D –RB
.
V c =0 by connecting a low leakage MOS
switch across capacitor
APPLICATIONS:
AM
Test & measurement instrumentation
INSTRUMENTATION
AMPLIFIER
INTRODUCTION
FEATURES
CIRCUIT DIAGRAM
OPERATION
DIFFERENTIAL MODE:
V1 NOT EQUAL TO V2
CURRENT FLOWS IN R & R’
.
OPERATION
OUTPUT VOLTAGE
V1’
V2’
V0 OUTPUT VOLTAGE

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Peak detector, instrumentation amp