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Special-Purpose Op-Amp Circuits

Q1: In the classic three-op-amp instrumentation amplifier, the differential voltage gain is usually produced by the

A first stage

B second stage

C mismatched resistors

D output op-amp

ANS:A - first stage

I think, in classic 3 stage opamp amplifier gain i.e Vout/Vin1-Vin2 equals 1+2R2/R1 (potentiometer). And therefore gain totally depends on r2 which is the feedback resistor for first opamp and the common pot r1.

Whereas it's dependence on pot is non-linear so they modified it by adding an additional opamp to get a linear gain.



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