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What is a stability factor?

  • A.The ratio of collector current to base current at bias
  • B.The change in gain per degree of temperature rise
  • C.The fraction of the supply appearing across the device
  • D.The change in collector current per unit change in leakage

Answer: D

The stability factor measures how much the collector current moves for a given change in leakage current, so a small value means a stable bias. It can be defined with respect to beta or to the base-emitter voltage as well, each isolating one drifting parameter. The current ratio is beta, and the other options describe unrelated quantities. A figure defined as a sensitivity is the natural way to compare bias arrangements, since it is the sensitivity rather than the nominal point that distinguishes them.

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