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How many ports are there in an n-stage cascading amplifier?

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How many ports are there in an n-stage cascading amplifier?

(a) 3

(b) 4

(c) 2

(d) 5

The question was asked by my school teacher while I was bunking the class.

My question is taken from N-Stage Cascading Amplifiers topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right option is (c) 2

To explain: An n-stage cascading 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, there fore numerous stages are combined to form a multistage amplifier.

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