Difference Op Amp Circuit Diagram A / amplifies the difference of two input signals. It functions as a subtractor. It has two inputs and one output, thus amplifies the difference between the voltages at the two inputs. The is useful for handling floating signal sources. The following schematic shows the . There are two resistors Rf and Rf ‘ as well as two Ri and Ri ‘ resistors.

For correct circuit operation, the two ratios p = Rf/Ri and q = Rf ‘/Ri ‘ must be precisely equal, then the Voutput will be calculated as:

vo = [q(p+1)/(q+1)]v2 – pv

If Ri = Ri ‘ and Rf = Rf ‘, the Voutput is:

vo = (v2 – v1) Rf/Ri

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