Analog Electronics
The voltage follower has a

  small open - loop voltage gain.
  large closed - loop output impedance.
  closed - loop voltage gain of unity.
  closed - loop bandwidth of zero.

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Analog Electronics
For transistor action

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

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