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How many methods of coupling are used for a high frequency response of multistage amplifier?

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How many methods of coupling are used for a high frequency response of multistage amplifier?

(a) 3

(b) 4

(c) 2

(d) 5

This question was addressed to me during an interview.

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

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The correct choice is (b) 4

The best explanation: There are four types of coupling mechanisms used. They are Resistance – capacitance coupling, thermal coupling, impedance coupling and transformer coupling. Resistance – capacitance coupling is the most vastly used mechanism.

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