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What is a complementary output stage?

  • A.A single device with a transformer output
  • B.An NPN and a PNP handling opposite halves
  • C.Two NPN devices driven from a phase splitter
  • D.Two devices of the same type in parallel

Answer: B

A complementary pair uses opposite-polarity devices, so each responds naturally to one half of the waveform and no phase splitter is needed. Two devices of the same type need a phase inverter ahead of them, which is the older quasi-complementary arrangement. The availability of well-matched complementary power devices is what made direct-coupled transformerless audio amplifiers practical.

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