Adjusting a filter of a time-continuous sigma-delta converter

Details Adjusting a filter of a time-continuous sigma-delta converter Adjusting a filter of a time-continuous sigma-delta converter

H - Electricity

03

M

H03M 3/00 (2006.01)

Patent

CA 2632143

This invention relates to adjusting a filter (110; 112) of a time-continuous Sigma-Delta converter (100) arranged to convert an analog input signal (Sin) to a digital output signal (Sout). A control signal (Sdet) indicative of a gain of the filter is provided, and the gain of the filter is adjusted in dependence of the control signal. The control signal (Sdet) is provided from the digital output signal of the Sigma-Delta converter. In this way the performance of the Sigma-Delta converter can be improved in a simple way that requires no or few additional analog components, and the Sigma-Delta converter itself is used to adjust its performance. Using a signal from the digital domain of the Sigma-Delta converter is advantageous in that it is typically easier, faster and more precise to process signals in the digital domain.

La présente invention concerne l'ajustement d'un filtre (110; 112) de convertisseur Sigma-Delta à temps continu (100) conçu pour convertir un signal d'entrée analogique (Sin) en un signal de sortie numérique (Sout). Un signal de commande (Sdet) indicatif d'un gain du filtre est produit et le gain du filtre est ajusté en fonction du signal de commande. Le signal de commande (Sdet) est produit à partir du signal de sortie numérique du convertisseur Sigma-Delta. De cette manière, la performance du convertisseur Sigma-Delta peut être améliorée d'une manière simple qui ne nécessite pas ou nécessite peu de composants analogiques supplémentaires, et le convertisseur Sigma-Delta lui-même est utilisé pour ajuster sa performance. L'utilisation d'un signal provenant du domaine numérique du convertisseur Sigma-Delta est avantageuse du fait qu'il est typiquement plus facile, plus rapide et plus précis de traiter des signaux dans le domaine numérique.

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