Cyclic analog-to-digital conversion

H - Electricity – 03 – M

Patent

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Details

H03M 1/40 (2006.01) H03M 1/06 (2006.01) H03M 1/66 (2006.01) H03M 1/72 (2006.01)

Patent

CA 2275645

Cyclic A/D-conversion of an analog input signal is performed according to a new and inventive recursive algorithm which generates a Gray coded digital output signal. In cyclic A/D-conversion, the output bits are generated cyclically, one by one. According to the inventive Gray coding algorithm, the analog input signal is cyclically subjected to a sample and hold operation, selectively, depending on the previously generated output bit, to a signal inversion, to an amplification by two, and to an addition of a predetermined reference signal. In a cyclic A/D-converter architecture based on the recursive 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 cyclic A/D- converter according to the invention.

On utilise pour la conversion A/N cyclique d'un signal analogique d'entrée le nouvel algorithme récursif de l'invention qui élabore un signal numérique de sortie codé en code Gray. Dans la conversion A/N cyclique, les bits de sortie sont produits cycliquement un par un. Conformément à l'algorithme de codage Gray, le signal analogique d'entrée est soumis cycliquement: à une opération d'échantillonnage/blocage, sélectivement, en fonction du bit de sortie produit antérieurement, à une inversion de signal, à une amplification par un facteur deux, et à l'addition d'un signal de référence prédéterminé. Dans une architecture de convertisseur A/N utilisant l'algorithme récursif de codage Gray de 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 cyclique de l'invention.

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