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How many ports are there in a high frequency response of multistage amplifier?

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How many ports are there in a high frequency response of multistage amplifier?

(a) 3

(b) 4

(c) 2

(d) 5

This question was posed to me in an interview.

My doubt is from High Frequency Response of Multistage Amplifiers in division Frequency Response of Electronic Devices & Circuits

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Best answer
Correct choice is (c) 2

The best explanation: A high frequency response of multistage amplifier is a two – port network assembled from a series of amplifiers. Each amplifier directs its output to the input of the subsequent amplifier. The performance obtained from a single – stage amplifier is inadequate, therefore numerous stages are combined to form a multistage amplifier.

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