The purpose of this circuit is to add two voltages. (The circuit also inverts
the signals, producing an output that is equal to the negative of the sum of
the two input voltages).
Adjust the two sliders on the left to change the input voltages to the circuit.
The two input signal currents merge and flow together through the feedback resistor.
The nominal gain for input 1 is -Rf/R1 and for input 2 is -Rf/R2.
You can change the gain by changing the values of any of the resistors. You
can also change the differential input resistance (typically 1 to 100 Megohm) and
and the open-loop gain (typically 50000 to 200000).
This page is maintained by Prof. T. C. O'Haver , Department of Chemistry and
Biochemistry, The University of Maryland at College Park.
Comments, suggestions and questions should be directed to
Prof. O'Haver at email@example.com.
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