Phase-locked loop

H - Electricity – 03 – L

Patent

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Details

H03L 7/085 (2006.01) H03L 7/089 (2006.01) H03L 7/191 (2006.01)

Patent

CA 2552394

An oscillator (30) supplies a high frequency signal (S) to a frequency divider (31) . A phase comparator (32) produces a signal measuring phase difference between the divided frequency signal (QA) and a reference signal. A low-pass filter (34) controls the oscillator on the basis of the measurement signal. A measurement window, of duration defined by counting cycles of the high frequency signal, is generated in response to each active edge of the divided frequency signal. The measurement signal is activated during the measurement window so that it comprises, when an active edge of the reference signal falls within the window, a first pulse between the start of the window and this edge and a second pulse, opposite to the first, between this edge and the end of the window.

L'invention concerne un oscillateur (30) alimentant un signal haute fréquence (S) dans un diviseur de fréquence (31). Un comparateur de phase (32) produit une différence de phase mesurant un signal entre le signal à fréquence divisée (QA) et un signal de référence. Un filtre passe-bas (34) commande l'oscillateur en fonction du signal de mesure. Une fenêtre de mesure, de durée définie par le décompte de cycles du signal haute fréquence, est générée en réponse à chaque bord actif du signal à fréquence divisée. Le signal de mesure est activé pendant la fenêtre de mesure de manière qu'il comprenne, quand un bord actif du signal de référence tombe dans la fenêtre, une première impulsion entre le début de la fenêtre et ce bord et une seconde impulsion, opposée à la première, entre ce bord et la fin de la fenêtre.

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