Discussion
A square-law modulator produces AM by
Answer: A
The sum of the two signals is applied to a nonlinear device whose square term produces the product, and a band-pass filter then selects the modulated components around the carrier. It is the simplest low-level modulator. A linear mixer cannot generate new frequencies at all. Switching the carrier gives a chopper or switching modulator, a related but distinct method. And supply-voltage variation is high-level anode or collector modulation, used in transmitters rather than at low level.
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