Filter with controlled offsets for active filter selectivity...

H - Electricity – 03 – H

Patent

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H03H 11/04 (2006.01)

Patent

CA 2373805

A filter is disclosed that actively controls one or more filter characteristics, such as the cut-off frequency of a selected filter pole, while minimizing the value of selected filter components such as the capacitor components. This helps improve the performance, reliability and yield of the filter. The filter rejects a selected frequency component or frequency band by actively providing an offset signal that effectively cancels the rejected frequency component or frequency band, while allowing the remaining frequency components or frequency bands to pass relatively freely to the output of the filter. The offset signal may also be used to actively reject a DC offset voltage or current from the input signal.

L'invention concerne un filtre qui commande activement au moins une caractéristique de filtrage, telle que la fréquence de coupure d'un pôle de filtre sélectionné, tout en minimisant la valeur de composants de filtre tels que les condensateurs. Cela contribue à améliorer les performances, la fiabilité et le rendement du filtre. Le filtre rejette une composante de fréquence sélectionnée ou une bande de fréquence activement en fournissant un signal de décalage qui annule efficacement la composante de fréquence ou la bande de fréquence rejetée, tout en permettant aux composantes de fréquence ou bandes de fréquence restantes de passer relativement librement pour aller jusqu'à la sortie du filtre. Le signal de décalage peut également être utilisé pour le rejet actif d'une tension de décalage continue ou d'un courant de décalage continu du signal d'entrée.

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