Demodulators – Frequency modulation demodulator – Input signal split into plural signals
Patent
1993-04-14
1994-08-23
Mis, David
Demodulators
Frequency modulation demodulator
Input signal split into plural signals
329319, 329321, 329336, 455214, H03D 306
Patent
active
053411072
ABSTRACT:
FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is frequency-modulated on a carrier, one of the two terminals being coupled to a first input of a first phase comparison circuit and the other terminal being coupled to a second input of the first phase comparison circuit via a first phase-shifting circuit which realizes a phase shift varying with said modulation signal, the first phase comparison circuit being connected to an output of the FM quadrature demodulator via a low-pass filter. In order to enhance, inter alia, the signal processing and the field of use of the FM quadrature demodulator, this demodulator includes a second phase comparison circuit having first and second inputs, in which one of the two in-phase and quadrature terminals is coupled to the first input of the second phase comparison circuit and the other terminal is coupled to the second input of the second phase comparison circuit via a second phase-shifting circuit which realizes a phase shift varying with the modulation signal, the FM quadrature demodulator also having a differential stage which is coupled between outputs of the two phase comparison circuits and an input of the low-pass filter.
REFERENCES:
patent: 4035730 (1977-07-01), Clayton
patent: 4618967 (1986-10-01), Vance et al.
patent: 4754228 (1988-06-01), Tomlinson
patent: 4914408 (1990-04-01), Voorman
patent: 5197085 (1993-03-01), Luff et al.
patent: 5220686 (1993-06-01), Kasperkovitz et al.
Ishigaki, M. et al.; "A Phase-Tracking Loop (PTL) Detector For FM Signals And Its Application To An FM Receiver" IEEE Trans. Cons. Elec. (USA) vol. CE-24, No. 3 (Aug. 1978) pp. 215-216.
Bijker Wolter
De Ruytere Hendricus C.
Kasperkovitz Wolfdietrich G.
Sloof Willem-Arie
Goodman Edward W.
Mis David
U.S. Philips Corporation
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