Method and apparatus for compensating for delays in...

H - Electricity – 03 – K

Patent

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H03K 7/00 (2006.01) H01Q 11/12 (2006.01) H03C 1/06 (2006.01) H03F 1/02 (2006.01) H03K 7/08 (2006.01) H04B 1/10 (2006.01)

Patent

CA 2320215

A modulator loop (700) designed to operate in a frequency range of interest is described. The loop (704) includes a loop output terminal and a switching stage, the output of which is coupled to the loop output terminal. The switching stage (704) has a first delay associated therewith. The output of a modulator stage is coupled to the input of the switching stage. A first feedback path is coupled between the loop output terminal and the feedback input of the modulator stage. A feedback filter is coupled between the output of the modulator stage and the feedback input of the modulator stage which compensates for the first delay. The feedback filter (708) is operable to transmit frequencies outside the frequency range of interest and attenuate frequencies in the frequency range of interest.

L'invention concerne une boucle de modulateur (700) capable de fonctionner dans la gamme de fréquences souhaitée. Ladite boucle (704) comprend une borne de sortie de boucle et un étage de commutation, dont la sortie est reliée à la borne en question. L'étage de commutation (704) fonctionne avec un premier retard associé. La sortie de l'étage de modulation est reliée à l'entrée de l'étage de commutation. Un premier trajet de réaction est établi entre la borne de sortie de la boucle et l'entrée de réaction de l'étage de modulation. Un filtre de réaction est placé entre la sortie de l'étage de modulation et l'entrée de réaction de cet étage, afin de compenser le premier retard. Le filtre de réaction (708) peut émettre des fréquences en dehors de la gamme de fréquences souhaitée et affaiblir les fréquences de ladite gamme.

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