Local oscillation frequency synthesizer

H - Electricity – 03 – B

Patent

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Details

H03B 19/00 (2006.01) H03L 7/23 (2006.01)

Patent

CA 2110860

First and second oscillation frequencies are supplied from first and second PLL synthesizers. First, the first oscillation frequency is increased by a predetermined frequency amount corresponding to the change-over of channels, and is instantly decreased to the original frequency, while the second oscillation frequency is increased at a time behind the increase of the first oscillation frequency without the decrease thereof to the original frequency by the predetermined frequency amount, such that the lowest level in the vibration of the first oscillation signal is coincident at timing to the highest level of the second oscillation signal. The first and second oscillation signals thus controlled are combined to provide an output oscillation signal.

La première et la deuxième fréquences d'oscillation sont fournies respectivement par le premier et le deuxième synthétiseurs PLL. Tout d'abord, la première fréquence d'oscillation s'accroît d'une fréquence déterminée correspondant au changement de canal, et revient instantanément à la fréquence initiale, alors que la deuxième fréquence d'oscillation s'accroît à un instant donné suivant l'accroissement de la première fréquence d'oscillation, sans qu'elle soit ramenée à la fréquence initiale, de telle sorte que le premier signal d'oscillation atteint son niveau le plus bas au moment où le deuxième signal d'oscillation atteint son niveau le plus élevé. Le premier et le deuxième signaux d'oscillation, contrôlés de cette façon, sont combinés pour produire un signal d'oscillation de sortie.

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