Electronics - Basic Op-Amp Circuits - Discussion
Discussion Forum : Basic Op-Amp Circuits - General Questions (Q.No. 10)
10.
In an averaging amplifier, the input resistances are
Discussion:
5 comments Page 1 of 1.
Historia said:
4 years ago
It's for the purpose of averaging, if you would look at the formula Vo = (-Rf) ( (Sum of Vin) /Rin) for it to perform the averaging process, (Rf/Rin) should represent the number of inputs.
So for example you have 3 inputs, Rf/Rin should be equal to 1/3 so that Vo = (Sum of Inputs)/3, which is just the average of the inputs. If Rf becomes greater than Rin then it is now a Scaling Adder.
So for example you have 3 inputs, Rf/Rin should be equal to 1/3 so that Vo = (Sum of Inputs)/3, which is just the average of the inputs. If Rf becomes greater than Rin then it is now a Scaling Adder.
Lakshmi said:
10 years ago
Can anyone post the circuit (give a drive link image) and explain why the relation?
Amol said:
1 decade ago
What is averaging amplifier?
Anurag said:
1 decade ago
Because we have to get average. Gain should be one divided by total no of input. So we make Rin equal to N times Rf. Where N is no of inputs.
Pandu said:
1 decade ago
Why the input restistance is greater than the feedback resistance when we averaging amplifier?
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