Discussion
Why does SSB require linear amplification?
Answer: A
The information is carried in a varying envelope, so a nonlinear stage would distort it and generate intermodulation products that spread outside the channel. That is the practical cost of the scheme, since linear amplifiers are less efficient than the class C stages an AM or FM transmitter can use. There is no carrier to preserve. Bandwidth grows only as a symptom of the distortion. And phase linearity matters but is not the reason amplitude linearity is required.
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