FSK with PLL (phase locked loop)

FSK Digital Frequency Modulation

FSK demodulation with PLL (phase locked loop)

Circuit:

Function FSK by  Vin:

Function V_xor by FSK:

Function Vco by Vf1:

Function Vout by Vin and Vtr:

Ref:

1.http://fabrice.sincere.pagesperso-orange.fr/LTspice/modulation_fsk_pll/fsk_pll_ltspice.html

2. Software: www.pyams.com