H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/11, 325/80
H03D 3/00 (2006.01) H04B 1/16 (2006.01) H04L 27/14 (2006.01) H04L 27/152 (2006.01) H04L 27/16 (2006.01)
Patent
CA 1175490
FREQUENCY SHIFT KEYING DEMODULATORS Abstract of the Disclosure: In an FSK demodulator, the output of the phase detector of a phase locked loop (PLL) is capacitively coupled to one input of an FSK voltage comparator, the capacitive coupling blocking d.c. and d.c. being restored at the comparator input by diodes connected between the two comparator inputs. The other input of the comparator is supplied with a reference voltage corresponding to a nominal center frequency of the FSK signals. A buffer amplifier permits rapid charging of the coupling capacitor, which is set to a determined state when there is no phase lock of the PLL. The arrangement facilitates demodulation of narrow-band FSK signals whose center frequency is subject to change. - i -
398255
Haley R. John
Nortel Networks Limited
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