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What is the other name for an emitter follower amplifier configuration?

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What is the other name for an emitter follower amplifier configuration?

(a) Common collector

(b) Common base

(c) Common emitter

(d) Amplifier circuit

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Question is from The Emitter Follower topic in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Correct option is (a) Common collector

The explanation is: The emitter follower circuit configuration is also known as the common collector configuration as it provides a high input impedance and a low output impedance. The emitter follower circuit acts as a buffer stage, and in result is used in several circuits where there is a need to prevent the loading of a circuit.

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