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

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

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Analog Electronics
The typical input stage of an opamp has a

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

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