Question
Which of the following describes a linear amplifier?
Answer Options
- A) Any RF power amplifier used in conjunction with an amateur transceiver
- B) An amplifier in which the output preserves the input waveform
- C) A Class C high efficiency amplifier
- D) An amplifier used as a frequency multiplier
Correct Answer: B
Explanation
Amplifiers are broadly categorized as either linear or non-linear. A linear amplifier is designed to reproduce the input signal faithfully at a higher power level. Linearity is critical for complex modes like Single Sideband (SSB), which contain amplitude variations that must be preserved.
A linear amplifier is defined as an amplifier in which the output preserves the input waveform. This means that if the input signal has no distortion, the output signal should ideally also have no distortion. Linear amplifiers typically operate in Class A, Class AB, or Class B.
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