Highly stable frequency synthesizer loop with feedforward

H - Electricity – 03 – J

Patent

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Details

H03J 7/02 (2006.01) H03L 7/07 (2006.01) H03L 7/18 (2006.01) H04B 1/16 (2006.01)

Patent

CA 2234855

A frequency synthesizer loop (200) includes a first voltage controlled oscillator (201) and a first divider circuit (202) for dividing a frequency of an output signal generated by the first voltage controlled oscillator (201) by a factor of N. The synthesizer loop (200) further includes a phase/frequency detector circuit (203), a loop filter circuit (204), a summing circuit (206), a feedforward amplifier (205), a second voltage controlled oscillator (207), and a second divider circuit (208), wherein the second divider circuit (208) divides a second output signal generated by the second voltage controlled oscillator (207) by a factor of M, and a microprocessor (210) varies the value of M to keep the first voltage in the middle of a range of the second voltage controlled oscillator (207).

Une boucle de synthétiseur de fréquences (200) comprend un premier oscillateur commandé par tension (201) et un premier circuit diviseur (202) pour diviser par un facteur de N une fréquence d'un signal de sortie généré par le premier oscillateur commandé par tension (201). La boucle de synthétiseur (200) comprend en outre un circuit détecteur de phase/fréquence (203), un circuit filtre à boucle (204), un circuit de sommation (206), un amplificateur à correction aval (205), un deuxième oscillateur commandé par tension (207), et un deuxième circuit diviseur (208), ce dernier (208) divisant par un facteur de M un deuxième signal de sortie généré par le deuxième oscillateur commandé par tension (207), et un microprocesseur (210) variant la valeur de M pour maintenir la première tension au milieu d'une plage du deuxième oscillateur commandé par tension (207).

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