Frequency synthesizer and frequency synthesizing method

Details Frequency synthesizer and frequency synthesizing method Frequency synthesizer and frequency synthesizing method

H - Electricity

03

J

H03J 7/06 (2006.01) H03L 7/10 (2006.01) H03L 7/18 (2006.01) H03L 7/183 (2006.01) H03L 7/089 (2006.01)

Patent

CA 2090523

ABSTRACT A frequency synthesizer and a frequency synthesizing method comprises, for the purpose of achieving frequency switching in a short time even though the switched width of an output frequency signal from the frequency synthesizer is narrow, a gate pulse generator circuit for generating a gate pulse signal using a frequency-division-number data-activation signal upon setting the output frequency from the frequency synthesizer; and a gate circuit for interrupting a reference frequency signal over a predetermined time interval with the aid of the gate pulse signal, and thereafter driving a voltage-controlled oscillator to switch to oscillate at a new frequency with the aid of a phase comparator, a charge pump circuit, and a low-pass filter.

ABRÉGÉ L'invention est constituée par un appareil et une méthode de synthèse de fréquences qui, pour obtenir une commutation de fréquences rapide même si la bande de fréquences du signal de sortie du synthétiseur de fréquences est étroite, utilisent un circuit générateur d'impulsions qui se sert d'un signal d'activation de données au moment de fixer la fréquence de synthèse, et un circuit de déclenchement servant à interrompre un signal de référence durant une période prédéterminée en utilisant l'impulsion de déclenchement, et à commander à un oscillateur commandé par la tension d'osciller à une nouvelle fréquence à l'aide d'un comparateur de phase, d'un circuit de pompage de charges et d'un filtre passe-bas.

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