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Instrumentation Amplifier


Another basic circuit configuration with operational amplifier is the instrumentation amplifier. This amplifier is same as difference amplifier but the difference is that both inputs are buffered before they are proceeded into the difference amplifier circuit. So, basically, this circuit is the same as difference amplifier but the two input sources see an infinite resistance load. The instrumentation amplifier circuit is shown on the Picture 1.


Picture 1: Instrumentation Amplifier

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