Compensation of mismatch errors in a time-interleaved...

H - Electricity – 03 – M

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H03M 1/12 (2006.01) H03M 1/06 (2006.01)

Patent

CA 2689287

A method for the compensation of frequency-response mismatch errors in M-channel time-interleaved ADCs. The compensation is done through an M-periodic time-varying filter h n ( k ) = h n mod M (k ) (2), or, equivalently, a set of Mtime-invariant filters hn (k), n = 0,1,..., M - 1. The overall compensation system is constructed by determining the Mfilter impulse responses h n (k) through M separate matrix inversions, where the size of the matrices equals the filter impulse response length. The invention further provides a compensated M -channel time-interleaved ADC (1, 2) based on and performing said method.

L'invention concerne un procédé de compensation des erreurs de désadaptation de réponse en fréquence dans des convertisseurs analogiques / numériques à entrelacement temporel à M canaux. La compensation est effectuée au moyen d'un filtre variant dans le temps M-périodique hn (k) = hn modM(k) (2), ou de manière équivalente, au moyen d'un ensemble de M filtres invariables dans le temps hn(k), n = 0,1,..., M - 1. Dans son ensemble, le système de compensation est mis en place par la détermination de M réponses impulsionnelles de filtre hn (k) via M inversions séparées de matrice, la taille des matrices étant égale à la durée de la réponse impulsionnelle de filtre. L'invention concerne également un convertisseur analogique / numérique compensé à entrelacement temporel à M canaux (1, 2) qui est basé sur ce procédé et le met en oeuvre.

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