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

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

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 Power transistor and silicon transistor.
 IGBTs and MOSFETs.
 SITs and BJTs.

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB forward biased.
  EB reversed biased and CB reversed biased.
  EB reversed biased and CB forward biased.
  EB forward biased and CB reversed biased.

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