Discussion
Which stage would you add to make a frequency discriminator serve a PM receiver?
Answer: D
A discriminator recovers the derivative of phase, so an integrator after it restores the phase and hence the PM message. Differentiating would compound the error. A limiter is needed in any angle receiver for amplitude noise but performs no conversion. And de-emphasis would apply a correction PM does not need, since its detector noise is already flat. Adding the inverse of whatever the detector does is the general recipe for adapting one angle detector to the other scheme.
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