Phase-locked loop

H - Electricity – 03 – L

Patent

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Details

H03L 7/14 (2006.01) H03L 7/08 (2006.01) H03L 7/191 (2006.01)

Patent

CA 2326519

A PLL comprises a phase comparator (20), a loop filter (21), a VCO (14), and a loop counter (22). The PLL further comprises a prediction window circuit (23) that produces HWIN (prediction window signal) for predicting positions where REF signals (standard signal) appear, and a loss compensation circuit (24) that detects the loss of the REF in the HWIN output and generates d.REFX (first corrective signal) for compensating for the loss and d.VARX (second corrective signal) for compensating for the phase difference between VAR (comparison signal) and d.REFX. If REF is lost, the phase comparator (20) performs appropriate compensation. If the phase difference between REF and VAR becomes close to zero, an accurate control voltage depending on the phase difference is supplied to a VCO by a gate control signal (Gc) that advances one clock pulse from the VAR phase.

L'invention concerne une boucle à phase asservie comportant un comparateur (20) de phase, un filtre (21) de boucle, un oscillateur (14) commandé en tension (VCO) et un compteur (22) de boucle. La boucle à phase asservie comporte en outre un circuit de fenêtre (23) de prédiction qui produit un signal de fenêtre de prédiction HWIN servant à prévoir des positions dans lesquelles apparaissent des signaux REF (signal étalon), et un circuit (24) de compensation de perte qui détecte une perte du signal de sortie REF ou HWIN, et produit un signal d.REFX (premier signal correcteur) servant à compenser la perte ainsi qu'un signal d.VARX (deuxième signal correcteur) servant à compenser une différence de phase entre VAR (signal de comparaison) et d.REFX. Si REF est perdu, le comparateur (20) de phase effectue une compensation appropriée. Si la différence de phase entre REF et VAR avoisine 0, une tension de commande précise dépendant de la différence de phase est fournie au VCO par un signal (Gc) de commande de porte qui est en avance d'une impulsion de synchronisation par rapport à la phase VAR.

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