Discussion
What does a phase-locked loop provide when used as a PM detector?
Answer: B
Used with a wide enough loop bandwidth, the phase error inside the loop tracks the modulation and is the recovered message, which makes the loop a natural PM detector as well as an FM one, the difference being which node is tapped. An envelope is constant here. A frequency count would give the derivative. And rectification belongs to amplitude detection. Recognising that one circuit can serve both angle schemes, depending on where the output is taken, is a genuinely useful piece of practical knowledge.
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