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Given the following circuit, find the maximum gain.

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Given the following circuit, find the maximum gain.

(a) 1+R2/R1

(b) –R3/R2

(c) 1+R3/R2

(d) 1+ R1.R3/2

I got this question in exam.

The doubt is from Frequency Filters topic in division Op-amps and its Applications of Analog Circuits

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Right choice is (c) 1+R3/R2

The explanation is: The above circuit is a low pass filter of the non-inverting type, where the input is at the non-inverting end. The gain is A = 1+R3/R2 / 1+jωR1C1

Thus maximum gain is A = 1+R3/R2.

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