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Why does a Schottky clamp across a switching transistor's collector-base junction help?

  • A.It prevents deep saturation and the storage delay
  • B.It reduces the conduction loss while the device is on
  • C.It protects the base-emitter junction from reverse voltage
  • D.It increases the current gain available at turn-on

Answer: A

The clamp diverts excess base current once the collector falls near the base, so the device stops just short of deep saturation and turns off promptly. It slightly increases the on-state voltage rather than reducing the loss, offers no base-emitter protection, and does not affect the gain. Trading a little conduction loss for a large reduction in switching delay is worthwhile whenever the switching frequency is high, and the whole Schottky logic family was built on that trade.

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