Describe the operation of class-C type of power amplifier with the help of neat sketch.

Describe the operation of class-C type of power amplifier with the help of neat sketch.
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1 Answer

Answer :

Circuit diagram:

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Operation: * Class C power amplifier is a type of amplifier where the transistor conducts for less than one half cycle of the input signal. Less than one half cycles means the conduction angle is less than 180° and its typical value is 80° to 120°. * Biasing resistor Rb pulls the base of Q1 further downwards and the Q-point will be set below the cut-off point in the DC load line. As a result the transistor will start conducting only after the input signal amplitude has risen above the base emitter voltage (Vbe~0.7V) plus the downward bias voltage caused by Rb. That is the reason why the major portion of the input signal is absent in the output signal. * Inductor L1 and capacitor C1 forms a tank circuit which is used in the extraction of the required signal from the pulsed output of the transistor. * Values of L1 and C1 are so selected that the resonant circuit oscillates in the frequency of the input signal. Since the resonant circuit oscillates in one frequency (generally the carrier frequency) all other frequencies are attenuated. 

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