Discussion
Why is a source follower preferred to an emitter follower in some designs?
Answer: C
A source follower's input impedance is set by a bias resistor and can be megohms, against an emitter follower's beta times the load. Its voltage gain is actually further from unity, because the transconductance is smaller, and its output impedance is higher for the same reason. Choosing between the two means deciding whether input impedance or output impedance matters more, and they pull in opposite directions. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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