An amplifier for continuous high gain, narrowband signal...

H - Electricity – 03 – J

Patent

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H03J 3/08 (2006.01) H03G 1/00 (2006.01) H03G 3/30 (2006.01) H03J 3/18 (2006.01) H03L 7/081 (2006.01)

Patent

CA 2280878

An apparatus and method to obtain a high Q, narrowband active filter with high gain suitable for an integrated circuit implementation. The high Q is achieved via active feedback with an amplitude control loop. The frequency control of the active filter is achieved by means of a frequency locked loop. Both control loops compare the thermal noise of the active filter itself to voltage and frequency references to achieve the stable operating point. Control loops are normally slow relative to the transmitted data, hence avoiding the data altering the operating point of the filter.

L'invention porte sur un appareil et un procédé permettant d'obtenir un filtre actif à facteur Q élevé et dont le gain élevé est approprié à la mise en oeuvre de circuits intégrés. On obtient le facteur Q par rétroaction active avec une boucle de régulation d'amplitude. On effectue la régulation de fréquence du filtre actif au moyen d'une boucle d'asservissement en fréquence. Les deux boucles de régulation comparent le bruit thermique du filtre actif lui-même avec les références de tension et de fréquence de façon à parvenir au point de fonctionnement stable. Les boucles de régulation sont normalement lentes par rapport aux données transmises, ce qui évite que les données modifient le point de fonctionnement du filtre.

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