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Opamps ==>

Current Summing Amplifier

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


we can calculate Vout as below

Therefore



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   
|  9.490 Views
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