The instrument amplifier circuit of the ordinary op-amp

Published:2011/6/27 19:46:00 Author:Borg | Keyword: instrument amplifier, op-amp | From:SeekIC

The circuit is in figure 1. The principle of the circuit is not complex. To make the circuit balanced, then R1=R2, R3=R4 and R5=R6, as the feature of each capacitor can't be the same, so on Pin1 and Pin of A1 and A2, we add the reset potentiometer of VR1 and VT2, which is practical in real application. We assume that all the mismatch, dissonance and current of A1 and A2 are 0, the DMV gain will be: The whole circuit is powered by two teams of positive and passive power supplies, which can amplify the forward or backward voltage.



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