Digitally controlled fractional frequency synthesizer

H - Electricity – 03 – L

Patent

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Details

H03L 7/18 (2006.01) H03L 7/185 (2006.01) H03L 7/197 (2006.01)

Patent

CA 2125443

The circuit arrangement of the invention presents an oscillator, whose frequency can be linearly varied within a wide control range, without affecting the oscillator's stability. The frequency of a fixed frequency generator (1) is divided to the desired frequency by a frequency divider (2), whose divider ratio can be varied in very small steps, and the resulting jitter is filtered out by a very simple phase control circuit (3). Improved short-term stability and holdover performance are also achieved. The oscillator can be universally used as clock generator in all digital circuit arrangements.

Le circuit de la présente invention comporte un oscillateur dont la fréquence peut varier linéairement dans une gamme de commande étendue sans que sa stabilité ne soit perturbée. La fréquence d'un générateur à fréquence fixe (1) est divisée jusqu'à la fréquence désirée par un diviseur de fréquence (2) dont le rapport de division peut être soumis à de très petites variations discrètes, et le sautillement résultant est éliminé par un circuit de commande de phase très simple (3). La stabilité à court terme et la performance de maintien sont également améliorées. L'oscillateur de l'invention peut être utilisé comme générateur de signaux d'horloge universel dans tous les circuits numériques.

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