Class C Power Amplifier
Class C Power Amplifier Circuit Diagram
The above Class C Power Amplifier Circuit Diagram bias resistor Rb pulls the base of Q1 further down and the point Q is placed somewhere below the cutoff point in the load line CC. Consequently, the transistor begins to drive only after the amplitude of the input signal exceeds the base voltage of the transmitter (Vbe ~ 0.7 V) and the down bias voltage caused by Rb… This is the reason why most input signal is missing from the output signal.
*The inductance L1 and capacitor C1 form a reservoir circuit, which allows it to extract the required signal from the pulse output of the transistor. Here the actual function of the active element (transistor) is as a function of the input in generating a series of current pulses and transmitting them in the resonance circuit for Class C Power Amplifier Circuit Diagram.
The values of L1 and C1 are selected so that the resonant circuit oscillates in the frequency of the input signal. Since the resonant circuit is oscillating in a frequency (usually carrier frequency), all other frequency recycling functions are attenuated and the required frequency can be eliminated by using the appropriate tuned load. Harmonics or noise in the output signal can be eliminated using additional filters.
The coupling transformer can be used to transfer energy to the load.
Power Amplifier Advantages and Disadvantages:
Advantages of a Class C power amplifier.
Excellent in RF applications.
Lowest physical size for given power output.
Disadvantages of a Class C power amplifier.
Not suitable in audio applications.
It creates a lot of RF interference.
It is difficult to obtain ideal inductors and coupling transformers.
Reduced dynamic range.
Applications of a Class C power amplifier.
Tuned amplifiers etc.
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