Digital synthesizer with coherent division

G - Physics – 06 – F

Patent

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G06F 1/03 (2006.01) G06F 7/72 (2006.01) H04L 27/12 (2006.01)

Patent

CA 2374707

The invention concerns a direct frequency digital synthesizing device. Said device comprises: a modulo M coherent accumulator (1) for generating a first phase law based on a frequency control word, a table (2) addressed by a second phase law derived from the first phase law, for generating a digital sine wave signal, a digital-to-analog converter (3) for converting the digital sine wave signal into an analog sine wave signal, a filter (4) for filtering the analog sine wave signal, and a divider (5) for dividing the filtered signal, the divider is of an order less than M and has a synchronizing input controlled by a synchronizing pulse for re-synchronizing the signal after division, the synchronizing pulse being worked out from the phase law. The invention is particularly applicable to digital synthesizers for radar.

L'invention concerne un dispositif de synthèse numérique directe de fréquence. Le dispositif comprend: un accumulateur cohérent (1), de modulo M, pour générer une première loi de phase à partir d'un mot de commande de fréquence, une table (2), adressée par une deuxième loi de phase dérivée de la première loi de phase, pour générer un signal sinusoïdal numérique, un convertisseur numérique analogique (3) pour convertir le signal sinusoïdal numérique en un signal sinusoïdal analogique, un filtre (4) pour filtrer le signal sinusoïdal analogique, et un diviseur (5) pour diviser le signal filtré, le diviseur a un certain ordre inférieur à M et il a une entrée de synchronisation commandée par une impulsion de synchronisation pour resynchroniser le signal après division, l'impulsion de synchronisation étant élaborée à partir de la loi de phase. Application: in particulier à des snthétiseurs numériques pour radar.

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