Analog Electronics
The emitter of the transistor is generally doped the heaviest because it

  is the first region of transistor.
  has to supply the charge carriers.
  has to dissipate maximum power.
  must possess low resistance.

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Analog Electronics
The typical input stage of an opamp has a

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

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