Discussion
What does the sensitivity of a phase modulator specify?
Answer: B
Sensitivity is radians per volt, the constant that turns a message amplitude into a phase deviation and hence into the index. Hertz per volt is the corresponding figure for a frequency modulator. Volts per radian inverts the relationship into something a detector might specify. And radians per hertz would imply a frequency dependence that PM does not have. Checking that a quoted sensitivity has the right units is the quickest way to tell which kind of modulator a data sheet is describing.
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