FM demodulator methods?

hello

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

Can you send some links or pdfs?

http://www.qsl.net/vk2dq/reading34.pdf

http://www.tpub.com/neets/book12/51c.htm

http://www.radio-electronics.com/inf...modulation.php

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.