H - Electricity – 03 – D
Patent
H - Electricity
03
D
H03D 3/00 (2006.01) H03D 3/06 (2006.01) H03D 7/14 (2006.01)
Patent
CA 2192038
In order to process an input signal (XP, XM) exhibiting a frequency modulation about an intermediate frequency, the demodulator comprises first mixing means (10,12) for producing a first signal (Y0) exhibiting the said frequency modulation about a transposition frequency below the intermediate frequency; switched-capacitor phase- shifter means (60) receiving the first signal (Y0) so as to produce a second signal (Y2) exhibiting, with respect to the first signal, a phase-shift varying in a manner substantially linear with frequency about the transposition frequency; two substantially identical low-pass filters (110,112) receiving the second signal (Y2) and the first signal (Y0) respectively; and second mixing means (130,132) which mix signals (HP-HM, LP-LM) produced by the first and second low-pass filters (110,112) respectively, in order to deliver a baseband output signal (Z).
our traiter un signal (XP, XM) modulé en fréquence par rapport à une fréquence intermédiaire, le démodulateur utilise un premier dispositif de mélange (10,12) pour produire un premier signal (Y0) portant la même modulation de fréquence par rapport à une fréquence transposée inférieure à la fréquence intermédiaire; un déphaseur à capacités commutées (60) servant à recevoir le premier signal (Y0) pour produire un second signal (Y2) déphasé par rapport au premier, le déphasage variant de façon essentiellement linéaire avec la fréquence au voisinage de la fréquence de transposition; deux filtres passe-bas (110,112) essentiellement identiques servant respectivement à recevoir le second signal Y2 et le premier (Y0); et un second mélangeur (130,132) qui mélange les signaux (HP-HM, LP-LM) produits par le premier et le second filtre passe-bas (110,112) respectivement pour produire un signal de bande de base (Z).
Guegnaud Herve
Robbe Michel
Fetherstonhaugh & Co.
Matra Communication
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