Characteristics of class-B amplifier

There are some important characteristics of class-B amplifier which are given below,

  • The operating point is located at or very near the collector cut off voltage.
  • The collector current flows only for one half of the cycle of the input signal.
  • The collector current is zero when there is no input signal.
  • The transistor dissipates no power with zero input signals. But, it increases with the increase in the amplitude of input signal.
  • The average current drawn by this circuit in class-B operation is smaller than that in class-A amplifier.
  • The maximum possible collector efficiency is about 50%.
  • The maximum possible overall efficiency is 78.5%.
  • The a.c output power is large.

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