Method and device for phase and frequency comparison

H - Electricity – 03 – L

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H03L 7/089 (2006.01) H03D 13/00 (2006.01)

Patent

CA 2463114

The invention concerns a phase and frequency comparator for feedback control of the frequency and the phase (Fvco) of a frequency-controlled oscillator output signal, on the basis of the frequency (Fref) and of the phase of a reference signal (Sref), comprising means (11, 12, 21, 22) for detecting in each of the reference signals (Sref) and coming from the oscillator of events representing the frequency and the phase of the signal, means (S1+, S1-, 16, 17) for generating a first or second signal, when an event is detected, means (S2+, S2-, 24 to 27) for generating a third or fourth signal, when an event is detected, if respectively the first or the second signal is generated, means for applying all the generated signals (Io; Vo) to the oscillator, means (13, 23) for stopping generation of the first and second signals or of all the signals when respectively the first and second signals or the third and fourth signals are simultaneously generated.

Le comparateur de phase et de fréquence pour asservir la fréquence et la phase (F¿vco?) du signal de sortie d'un oscillateur commandé en fréquence, en fonction de la fréquence (F¿ref?) et de la phase d'un signal de référence (S¿ref?), comprend des moyens (11, 12, 21, 22) pour détecter dans chacun des signaux de référence (S¿ref?) et provenant de l'oscillateur des événements représentatifs de la fréquence et de la phase du signal, des moyens (S1?+¿, SI?-¿, 16, 17) pour générer un premier ou second signal, lors de la détection d'un événement, des moyens (S2?+¿, S2?-¿, 24 à 27) pour générer un troisième ou quatrième signal, lors de la détection d'un événement, si respectivement le premier ou second signal est généré, des moyens pour appliquer tous les signaux générés (I¿o? ; V¿o?) à l'oscillateur, des moyens (13, 23) pour arrêter la génération des premier et second signaux ou de tous les signaux lorsque respectivement les premier et second signaux ou les troisième et quatrième signaux sont générés simultanément.

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