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What is the application of an emitter follower amplifier?

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What is the application of an emitter follower amplifier?

(a) Positive feedback

(b) Voltage gain

(c) Power gain

(d) Impedance matching

This question was addressed to me by my college professor while I was bunking the class.

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

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Right choice is (d) Impedance matching

Explanation: The high input impedance along with low output impedance makes the emitter follower amplifier ideal for impedance matching. Along with that, its key characteristics include a comparatively high current and power gain.

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