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Which of the following acts as a buffer?

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Which of the following acts as a buffer?

(a) CC amplifier

(b) CE amplifier

(c) CB amplifier

(d) cascaded amplifier

I have been asked this question in homework.

I would like to ask this question from The AC Analysis of a Small-Signal Low-Frequency Common Emitter Transistor. in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct option is (a) CC amplifier

Explanation: The voltage gain of a common collector amplifier is unity. It is then used as a buffer. The CC amplifier is also called as an emitter follower.  Though there is no amplification done, the output will be stabilised.

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