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Doherty Amplifier

invented in 1936 by W. H. Doherty.

traditional PA, class AB for example, have a low efficiency(15~25%) at backoff powers.

DPA enables high efficiency at backoff powers.

Consist of:

  • two PA in parallel, Main and peak
  • two 90° line at the input and output

same phase when they are ON, and same output phase 180°

  • main PA is biased as class A, AB, B, F...
  • peak PA is biased as class C. Which means it Vg<Vpinchoff
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