Class C Power Amplifiers – Circuit Diagram, Operation and Applications:

A class C power amplifiers is biased to operate for less than 180° of the input signal cycle, as shown in Fig. 17.22.

The tuned circuit in the output, however, will provide a full cycle of output signal for the fundamental or resonant frequency of the tuned circuit (L and C tank circuit) of the output.

The use of such amplifiers is, therefore, limited for a fixed frequency, as occurs in communication circuits. Operation of a class C circuit is not intended primarily for large signal or power amplifiers.