Discussion
Which detector will demodulate PM without any additional processing?
Answer: B
A coherent phase detector reads phase directly against a reference, which is exactly what PM encodes. A frequency discriminator recovers the derivative and needs a following integrator. An envelope detector reads amplitude, which is constant here. And a ratio detector is a frequency discriminator with built-in limiting, so it too gives the derivative. Matching the detector to the modulated quantity, rather than to the family, is what makes these choices obvious. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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