Class C BJT Amplifiers
Discrete Semiconductor Devices and Circuits
Shown here is a schematic diagram for a class-C RF (radio frequency) amplifier circuit:
This circuit will look very strange if you are accustomed to analyzing audio-frequency and DC amplifier circuits. Note some of the distinct differences between this amplifier and an amplifier used to boost audio signals. Also, explain what “class-C” operation means, and how this amplifier is able to output a continuous sine wave despite the transistor’s behavior in class-C mode.
Finally, write an equation that predicts this amplifier’s operating frequency, based on certain component values which you identify.
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