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question on PLL-based FSK demodulator

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abcyin

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Hi, all

From the documents, I learned that most of the PLL-based FSK demodulators take the control voltage of the VCO as the modulating signal, but do you anyone know any other methods about PLL-based demodulator? I mean any other circuit architecture for this domain using PLL.

any documents are warmly welcome,

best regards.
 

For FM demodulation: If modulation index is low (max. phase deviation less than 1 radian), you could use a narrow-band PLL as a phase demodulator. The output is the ouput of the phase detector, that after derivation gives the frequency.
This can work for low-index FM but not for FSK.
Why do you need a method other than take the control voltage of the VCO?
Regards

Z
 

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