Analog Electronics
A D - MOSFET can operate in the

  depletion - mode only .
  enhancement - mode only.
  low - impedance.
  depletion - mode or enhancement - mode.

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Analog Electronics
For transistor action

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

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