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What is the application of a high frequency response of emitter follower amplifier?

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What is the application of a high frequency response of emitter follower amplifier?

(a) Positive feedback

(b) Voltage gain

(c) Power gain

(d) Impedance matching

I got this question during an interview.

My question comes from High-Frequency Response of the Emitter Followers in section Frequency Response of Electronic Devices & Circuits

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Correct choice is (d) Impedance matching

Easy explanation: The high input impedance along with low output impedance makes the high frequency response of 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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