Analog Electronics
A D - MOSFET can operate in the

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

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Analog Electronics
The typical input stage of an opamp has a

  differential input and single - ended output.
  differential input and differential output.
  single - ended input and single-ended output.
  single - ended input and differential output.

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