Phase-locked loop frequency modulation circuit for input...

H - Electricity – 03 – C

Patent

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H03C 3/00 (2006.01) H03C 3/09 (2006.01) H03L 7/08 (2006.01) H03L 7/085 (2006.01) H03L 7/093 (2006.01)

Patent

CA 2176365

A phase-locked loop frequency modulation circuit that compensates for the inability of a phase-locked loop to pass low-frequency content of an input modulation signal, and that may be utilized with existing communication apparatus, such as a cellular telephone voice radio, for accurate data transmission without having to modify such apparatus, includes a compensation circuit (50) for processing an input modulation signal (72) to provide a compensation signal (78) that is added to a loop filter output signal (70) by processing the input modulation signal to provide the same effect as adding the input modulation signal to an integrated input modulation signal (74) that is filtered by a filter (54) having the same transfer function as the loop filter (46) to provide the compensation signal.

Circuit de modulation de fréquence à boucle à verrouillage de phase compensant l'incapacité d'une boucle à verrouillage de phase de laisser passer le contenu à basse fréquence d'un signal de modulation d'entrée et pouvant être utilisé avec les appareils de communication existants tels que les radiotéléphones cellulaires à fréquence vocale pour transmettre des données avec précision, sans avoir à les modifier. Ledit circuit comprend un circuit de compensation (50) destiné au traitement d'un signal de modulation d'entrée (72) de façon à produire un signal de compensation (78) qu'on additionne au signal de sortie (70) d'une boucle de filtrage en traitant le signal de modulation d'entrée (72), de façon à obtenir le même effet qu'en additionnant le signal de modulation d'entrée à un signal de modulation d'entrée intégré (74) filtré par un filtre (54) présentant la même fontion de transfert que le filtre en boucle (46) pour fournir le signal de compensation.

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