Analog Electronics
In a bipolar junction transistor the base region is made very thin so that

  base can be easily biased.
  base can be easily fabricated.
  recombination in base region is minimum.
  electric field gradient in base is high.

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

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