Discussion
How is pulse width modulation generated most simply?
Answer: B
A comparator fed with the message and a sawtooth switches whenever the two cross, so the output's duty cycle follows the message amplitude. That is why the same circuit appears in switching power supplies and motor drives as well as in communication. Differentiating extracts edges rather than creating them, multiplication by a pulse train gives amplitude modulation, and integrating with clipping describes neither. A comparator against a periodic reference is the standard way to turn an amplitude into a time, and recognising the pattern makes many pulse circuits immediately readable.
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