Electronics - Special-Purpose Op-Amp Circuits - Discussion
Discussion Forum : Special-Purpose Op-Amp Circuits - General Questions (Q.No. 12)
12.
In the classic three-op-amp instrumentation amplifier, the differential voltage gain is usually produced by the
Discussion:
2 comments Page 1 of 1.
Nikhil said:
1 decade ago
How its possible sir?
Ashish kr singh said:
8 years ago
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.
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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