System for generating an accurate low-noise periodic signal

Details System for generating an accurate low-noise periodic signal System for generating an accurate low-noise periodic signal

H - Electricity

03

L

H03L 7/18 (2006.01) G06F 1/02 (2006.01)

Patent

CA 2336383

In the illustrative embodiment, the inventive system includes a low-bit digital-to-analog converter (68) for converting a first signal at a reference frequency to a digital signal. A delta-sigma converter is included for suppressing noise in the digital signal within the predetermined range of the reference frequency and providing a noise-shaped signal in response thereto. A bandpass filter (72) filters out the out-of-band noise and provides an accurate periodic signal which lacks glitch noise. In a particular embodiment, the inventive system further includes a direct digital synthesizer (42) for providing the first signal at the first frequency and the accurate reference periodic signal is supplied as reference signal to a phase-locked loop (50).

Selon un mode de réalisation caractéristique, le système selon l'invention concerne un dénumériseur à voie binaire étroite (68) permettant de convertir un premier signal généré à une fréquence de référence en un signal numérique. Un convertisseur delta-sigma supprime le bruit dans le signal numérique à l'intérieur d'une plage prédéterminée de fréquences de référence et génère en retour un signal en forme de bruit. Un filtre passe-bande (72 )filtre le bruit hors bande et génère un signal périodique précis sans déformation. Selon un mode de réalisation particulier, le système comporte un synthétiseur numérique direct (42) qui produit le premier signal à la première fréquence et le signal périodique précis de référence comme signal de référence pour la boucle à phase asservie (50).

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