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What is the purpose of RC or transformer coupling?

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What is the purpose of RC or transformer coupling?

(a) To block a.c.

(b) To separate bias of one stage from another

(c) Increase thermal stability

(d) Increase Efficiency

The question was posed to me in quiz.

My question comes from Multistage Amplifier in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct option is (b) To separate bias of one stage from another

The best explanation: In RC or transformer coupling, a capacitor / transformer is used as coupling device which connects output of first stage with input of second stage. Its function is to pass the a.c signal and blocks d.c. bias voltage.

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