Pipeline analog-to-digital conversion

H - Electricity – 03 – M

Patent

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Details

H03M 1/44 (2006.01) H03M 1/06 (2006.01) H03M 1/66 (2006.01) H03M 1/72 (2006.01)

Patent

CA 2275644

Pipeline A/D-conversion of an analog input signal is performed according to a new and inventive algorithm which generates a Gray coded digital output signal. A pipeline A/D-converter comprises a number of cascaded stages through which the analog input signal is propagated. Each stage generally generates an output bit of the digital output signal, and furthermore processes the pipeline signal. According to the inventive Gray coding algorithm, the output bit generated in a stage determines whether or not the pipeline signal of that stage is inverted. In a pipeling A/D-converter based on the Gray coding algorithm according to the invention, the accumulation of offset errors will generally be very low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations which further improve the performance of the inventive pipeline A/D-converter. In another embodiment of the invention, the Gray coding algorithm is modified to form a second algorithm which makes low device count implementations possible.

La conversion A/N pipeline d'un signal analogique d'entrée se fait à l'aide d'un nouvel algorithme selon la présente invention, produisant un signal numérique de sortie à codage Gray. Le convertisseur A/N pipeline comporte plusieurs étages en cascade à travers lesquels se propage le signal d'entrée analogique. Chacun des étages produit l'un des bits de sortie du signal numérique de sortie et traite en outre le signal pipelinisé. En fonction de l'algorithme de codage Gray, le bit de sortie produit dans un étage détermine si le signal pipeline de cet étage est oui ou non inversé. Dans un convertisseur A/N pipeline utilisant l'algorithme de codage Gray selon l'invention, l'accumulation des erreurs de décalage est généralement très faible. De plus, le fait que l'inversion de signal soit commandée numériquement autorise des réalisations de grande précision qui améliorent encore les performances du convertisseur A/N pipeline selon l'invention. Dans une variante, l'algorithme de codage Gray est modifié pour former un deuxième algorithme qui rend possibles des réalisations à faible nombre de dispositifs.

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