Analog Electronics
Asource follower using an FET usually has a voltage gain which is

Slightly less than unity but positive
Greater than +100
About -10
Exactly unity but negative

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Analog Electronics
For transistor action

  all of these.
  the emitter should be heavily doped.
  Je must be forward biased and Jc should be reverse biased.
  the base region must be very thin and lightly doped.

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