Discussion
Why is an emitter follower's gain so insensitive to the device?
Answer: A
The whole output voltage is fed back in series with the input, so the feedback factor is essentially one and the gain is pinned just below unity whatever the device does. The emitter resistance is small but not negligible, and the collector's role and the base current are beside the point. Complete feedback is what makes a gain of one the most reliable gain in electronics, and it is why followers appear wherever fidelity matters more than amplification.
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