Discussion
Why can a follower become unstable when driving a capacitive load?
Answer: A
A follower's output impedance is inductive over part of its range because the reflected source impedance rises with frequency, and that inductance with a capacitive load forms a resonant circuit that can ring or oscillate. The gain does not exceed unity, and the output impedance rises rather than falling. A small series resistor at the output damps it, which is why one is so often found there in practice even though the ideal analysis says it is unnecessary.
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