System and method for reducing transient responses in a...

H - Electricity – 03 – L

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H03L 7/06 (2006.01) H03L 7/10 (2006.01)

Patent

CA 2670521

A system and method for reducing the transient responses in a phase lock loop (PLL) (100) with variable oscillator gain is disclosed. The system includes a charge pump (104) having an adapt mode and a normal mode of operation. The charge pump (104) also includes controlled trickle currents from current sources (208), (210) which are applied to the output (105), (107) of charge pump (104) to minimize the transient responses of the PLL (100). A programmable delay is provided in the charge pump (104) and is configured using a controller (122) based on the variable oscillator gain for the PLL (100). The configured programmable delay is used in the adapt mode of operation for adding a trickle current from the current source (210) to the adapt mode output (107).

L'invention concerne un système et un procédé pour réduire les réponses transitoires dans une boucle à verrouillage de phase (PLL) (100) avec un gain d'oscillateur variable. Le système comprend une pompe de charge (104) ayant un mode de fonctionnement d'adaptation et un mode de fonctionnement normal. La pompe de charge (104) comprend également des courants d'entretien commandés provenant de sources de courant (208), (210) qui sont appliqués à la sortie (105), (107) de la pompe de charge (104) pour rendre minimales les réponses transitoires de la PLL (100). Un retard programmable est fourni dans la pompe de charge (104) et est configuré en utilisant une unité de commande (122) selon le gain d'oscillateur variable pour la PLL (100). Le retard programmable configuré est utilisé dans le mode de fonctionnement d'adaptation pour ajouter un courant d'entretien de la source de courant (210) à la sortie de mode d'adaptation (107).

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