Active-rc filter with compensation to reduce q enhancement

Details Active-rc filter with compensation to reduce q enhancement Active-rc filter with compensation to reduce q enhancement

H - Electricity

03

H

H03H 11/12 (2006.01)

Patent

CA 2577206

An active filter with compensation to reduce Q-enhancement is disclosed. The filter may include a first amplifier (202a) and a second amplifier (202b) coupled to the first amplifier. The second amplifier having a negative feedback loop including a buffer (702) having a plurality of compensation resistors (RC2) and a capacitor (C2). The compensation resistors may each have a value that results in the biquad filter having substantially zero Q- enhancement. The biquads may cascaded to form higher order filters.

L'invention concerne un filtre actif à compensation pour réduire l'augmentation de Q. Ce filtre peut comporter un premier amplificateur et un deuxième amplificateur couplé au premier amplificateur. Le deuxième amplificateur a une boucle de retour négative comportant un tampon ayant une pluralité de résistances de compensation. Les résistances de compensation peuvent chacune avoir une valeur qui génère un filtre biquad ayant une augmentation de Q sensiblement égale à zéro. Les biquads peuvent être mis en cascade pour former des filtres d'ordre supérieur.

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