Opamp Current Summing Amplifier

the picture below shows us several current sources connected to the negativ input an opamp (ex.741)

summing circuit with opamp


we can calculate Vout as below






If R1=R2=R3 (=R) we have




and the output voltage is proportional to the sum of the input voltages.

For only one input and a constant reference voltage


where the second term represents an offset voltage. This provides a convenient method for obtaining an output signal with any required voltage offset.

Keywords : Opamp, Op-amp, Amplifiers, Current, Summing, Amplifier, Amplificator, Amplification, Info, Tutorial
Writer : delon  |
18 Apr 2006 Tue   
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