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FM demodulator methods?

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7rots51

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hello

what are the FM demodulator methods?(for voice or FSK data)

Can you send some links or pdfs?
 

There are several standard methods.

PLL works best at low SNRs

Phase shift and multiply by the original signal. The shift can be done with a LC network or a delay line.

Pulse counting is the most linear but requires very high SNR. The RF cycles trigger a fixed duration monostable and the output is low pass filtered.

Then there are the LC networks with diodes used in the early days.
 

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