Fixed compromise equalization for a dual port fm modulator

H - Electricity – 03 – C

Patent

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Details

H03C 3/00 (2006.01) H03C 3/09 (2006.01)

Patent

CA 2218373

A dual port frequency modulator and method for eliminating the undesired effects caused by high port/low port phase differences in a standard dual port frequency modulator. The frequency modulator includes an inverse filter stage coupled to the input of a modulator stage including a first high port processing path for processing high frequency components of a modulation signal and a second low port processing path for processing low frequency components of a modulation signal. The outputs of the high and low paths are coupled to separate ports of a voltage controlled oscillator. The impulse response of the inverse filter is designed to be the inverse of the impulse response of the modulator stage. The filter functions to counteract the adverse effects caused by the delay difference in the high and low processing paths of the modulator stage such that the overall response of the dual port frequency modulator is significantly improved.

L'invention concerne un modulateur de fréquence à deux ports et un procédé pour éliminer les effets indésirables provoqués par des différences de phase port haut/port bas dans un modulateur de fréquence standard à deux ports. Le modulateur de fréquence comprend un étage de filtration inverse couplé à l'entrée d'un étage modulateur comprenant un premier chemin de traitement par le port haut pour traiter les composantes hautes fréquences d'un signal de modulation et un second chemin de traitement par le port bas pour traiter les composantes basses fréquences du signal de modulation. Les sorties des chemins haut et bas sont couplées à des ports séparés d'un oscillateur commandé en tension. La réponse impulsionelle du filtre inverse est conçue pour être l'inverse de la réponse impulsionnelle de l'étage modulateur. Le filtre fonctionne pour contrecarrer les effets néfastes provoqués par la différence du délai dans les trajets de traitement haut et bas de l'étage modulateur, si bien que la réponse globale du modulateur de fréquence à deux ports est améliorée de manière appréciable.

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