The classic three- op- amp instrumentation amplifier will have a differential gain of 1 if RG is not connected.

Name: The classic three- op- amp instrumentation amplifier will have a differential gain of 1 if RG is not connected.
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Question

Quizplus · Accepted Answer

The differential gain of an instrumentation amplifier is given by:$$Ad = (R2/R1) * (1 + 2Rf/Rg)$$If Rg is not connected, then Rg = ∞, and the differential gain becomes:$$Ad = (R2/R1) * (1 + 2Rf/∞) = (R2/R1)$$If R1 = R2, then the differential gain becomes 1.

The Classic Three- Op- Amp Instrumentation Amplifier Will Have a Differential