Question
For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?
Answer Options
- A) SSB
- B) FM
- C) AM
- D) All these choices are correct
Correct Answer: B
Explanation
A Class C amplifier is highly non-linear, meaning its output waveform is a distorted, high-efficiency version of the input waveform. This non-linearity makes it completely unsuitable for amplifying signals whose amplitude carries information, such as SSB or AM, as the signal’s information would be destroyed.
However, a Class C amplifier is appropriate for amplifying a Frequency Modulated (FM) signal. FM is a constant-envelope mode, meaning the information is carried in the frequency variations, not the amplitude variations. Since the Class C stage only needs to be driven hard enough to produce the constant-amplitude output carrier, it can be used for FM transmission with very high efficiency.
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