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.