Analog Electronics
Class AB operation is often used in power large signal) amplifiers in order to

Remove even harmonics
Overcome a crossover distortion
Reducing collector dissipation
Get maximum efficiency

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Analog Electronics
For an NPN transistor in normal bias

  Je is forward biased and Jc is reverse biased.
  only majority carriers cross the collector junction.
  the emitter junction has high resistance.
  only holes cross the collector junction.

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