+1 vote
in Linear Integrated Circuits by (37.1k points)
Find out the gain value  by which each input of the averaging amplifier is amplified ?( Assume there are four inputs)

(a) 0.5

(b) 0.25

(c) 1

(d) 2

I got this question in a job interview.

Asked question is from Summing, Scaling & Averaging Amplifier in division Operational Amplifier Applications of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Accurate choice is (b) 0.25

Breaking it down, I'd say: In an averaging amplifier, the gain by which each input is amplified must be equal to lower number of input.

=> RF /R =1/n , where n=number of inputs

∴ RF /R=1/4 = 0.25 (Four inputs)

So, each input in the averaging amplifier must be amplified by 0.25.

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