Phase locked loop with d.c. modulation

Details Phase locked loop with d.c. modulation Phase locked loop with d.c. modulation

H - Electricity

03

L

331/33, 332/36

H03L 7/07 (2006.01) H03C 3/09 (2006.01) H03L 7/099 (2006.01) H03L 7/193 (2006.01)

Patent

CA 2033861

A D.C. modulated phase locked oscillator, or electrical device, is provided; and a radio frequency receiver, or signal processing apparatus, is provided that utilizes the D.C. modulated phase locked oscillator. The D.C. modulated phase locked oscillator includes a phase locking oscillator and a D.C. modulator. Both a forward path and a feedback path are D.C. modulated. D.C. modulation of the feedback path optionally includes changing the frequency in the feedback path as a function of the: frequency of a modulation oscillator, changing the frequency in the feedback path by a plurality of pulses for each cycle of the modulation oscillator, removing pulses from the feedback path, adding pulses to the feedback path, dividing the frequency in the feedback path by higher and lower dividing ratios, preventing one cycle in the feedback path from developing a "high" in the feedback path, and holding a "high" in the feedback path between two adjacent pulses.

L'invention est constituée par un oscillateur à asservissement de phase à modulation par courant continu ou par un dispositif électrique utilisé par un récepteur radiofréquence ou un appareil de traitement de signaux. Cet oscillateur comprend un oscillateur d'asservissement de phase et un modulateur à courant continu. Un trajet direct et un trajet de rétroaction sont modulés. Dans le trajet de rétroaction, la modulation peut facultativement modifier la fréquence en fonction de la fréquence de l'oscillateur de modulation, modifier la fréquence d'une pluralité d'impulsions à chaque cycle de l'oscillateur de modulation, éliminer des impulsions, ajouter des impulsions, diviser la fréquence par un rapport supérieur ou inférieur à l'unité, empêcher un cycle de s'emballer et maintenir l'emballement entre deux impulsions adjacentes.

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