Analog Electronics
The transition capacitance of a reverse biased pn junction having uniform doping on both sides, varies with junction voltage ( VB ) as

  ( VB )2.
  ( VB )- 1 / 2.
  1 / VB.
  VB.

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Analog Electronics
Optocouplers combine

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

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