Bipolar transistors

Which is a characteristic of a Darlington connection of two transistors?

  1. AThe two are paralleled to double the breakdown voltage
  2. BIt is a connection used to build oscillators
  3. CThe overall current gain is roughly the product of the individual current gains
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Answer: C. The overall current gain is roughly the product of the individual current gains

In a Darlington connection, the emitter current of the first transistor drives the base of the second. The overall current gain is about hFE1 × hFE2, giving a very large current gain. In return, the base-emitter voltage roughly doubles and switching becomes slower.

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More Bipolar transistors questions

  1. In a PNP transistor, which carriers are injected from the emitter into the base and mainly carry the current?
  2. Which is a characteristic of a common-collector amplifier (emitter follower)?
  3. Which is a characteristic of a common-base amplifier?
  4. What does the transition frequency fT of a bipolar transistor mean?
  5. Which correctly describes thermal runaway in a bipolar transistor?