Class AB power amplifiers

jojo October 20, 2011 No Comments

 

Class AB Amplifier Operation

Class AB Amplifier Operation

In class AB power amplifiers, the biasing circuit is so adjusted that the operating point Q lies near the cut-off voltage. During a small portion of negative half cycle and for complete positive half cycle of the signal, the input circuit remains forward biasedand hence collector current flows. But during a small portion (less than half cycle) of the negative cycle”‘ the input circuit is reverse biased and, therefore, no collector current flows during this period. Class AB operation needs a push-pull connection to achieve a full output cycle.

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