Apparatus and method for reducing harmonic interference...

H - Electricity – 04 – B

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H04B 15/00 (2006.01) H03B 1/04 (2006.01) H03D 1/04 (2006.01) H04B 1/52 (2006.01)

Patent

CA 2081004

An apparatus and method therefor substantially reducing the interference of a harmonic frequency component (301) of a clock signal with a filtered received signal (302), comprises a frequency spreading signal generator (127) and a signal modulator (125). The frequency spreading signal generator (127) produces a frequency spreading signal (130). The signal modulator (125) modulates the clock signal, produced by a clock signal generator (129), with the frequency spreading signal (130) to produce a modulated clock signal (131) including a modulated harmonic frequency component (303). The power level of a modulated harmonic frequency component (303), corresponding to the harmonic frequency component interfering with the filtered signal (202-204), is spread over a frequency bandwidth (f6-f7) greater than the predetermined frequency bandwidth (f4-f5) causing the power level of the modulated harmonic frequency component (303) within the predetermined frequency bandwidth (f4-f5) to decrease.

Dispositif et méthode permettant de réduire sensiblement l'interférence d'une composante de fréquence harmonique (301) d'un signal d'horloge avec un signal reçu filtré (302). Comprend un générateur de signal d'étalement de fréquence (127) et un modulateur de signal (125). Le générateur de signal d'étalement de fréquence (127) produit un signal d'étalement de fréquence (130). Le modulateur de signal (125) module avec le signal d'étalement de fréquence (130) le signal d'horloge produit par un générateur de signal d'horloge (129), afin de produire un signal d'horloge modulé (131) comprenant une composante de fréquence harmonique modulée (303). Le niveau de puissance d'une composante de fréquence harmonique modulée (303), correspondant à la composante de fréquence harmonique interférant avec le signal filtré (202-204), est étalé sur une bande de fréquences (f6-f7) supérieure plus large que la bande de fréquences prédéterminée (f4-f5), ce qui réduit la puissance de la composante de fréquence harmonique modulée (303) dans la bande passante prédéterminée (f4-f5).

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