Bipolar transistors

In a PNP transistor, which carriers are injected from the emitter into the base and mainly carry the current?

  1. AElectrons
  2. BHoles
  3. CIons
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Answer: B. Holes

In a PNP transistor, holes are injected from the p-type emitter into the n-type base, cross the base, and are collected by the p-type collector. In an NPN transistor, electrons play the same role. Because electrons have higher mobility, NPN transistors are often used in high-speed applications.

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More Bipolar transistors questions

  1. Which is a characteristic of a common-collector amplifier (emitter follower)?
  2. Which is a characteristic of a common-base amplifier?
  3. What does the transition frequency fT of a bipolar transistor mean?
  4. Which correctly describes thermal runaway in a bipolar transistor?
  5. Which is a characteristic of a SiGe HBT (heterojunction bipolar transistor)?