Method and apparatus for all code testing

G - Physics – 01 – R

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G01R 31/28 (2006.01) H03M 1/10 (2006.01) H03M 1/12 (2006.01)

Patent

CA 2119507

A device, such as an A/D converter for generating successive codes, each in accordance with the level of an input analog voltage, may be tested to determine if all codes have been generated by applying a voltage V, having an amplitude that varies between 0 and V volts. The variation in the voltage V, is such that when the device is operating properly, it will generate all of its codes during a predetermined interval. Each code generated by the device is compared by a comparator to the count of an.pi.-bit counter whose count is initialized at zero. Each time the count of the counter matches the code produced by the device, the counter is incremented. If the counter overflows (i.e., its count has exceeded 2.pi.-1) within a prescribed interval, then the device is said to be operating properly.

Un dispositif tel qu'un convertisseur analogique-numérique servant à produire des codes successifs, chacun de ces codes étant produit selon le niveau d'une tension analogique d'entrée, peut être examiné pour déterminer si tous les codes ont été produits par une tension V dont l'amplitude varie entre 0 et V volts. La variation de cette tension V est telle que, quand le dispositif fonctionne correctement, il produit tous ses codes durant un intervalle prédéterminé. Chaque code produit par le dispositif est comparé par un comparateur au compte indiqué par un compteur de bits dont le compte est initialisé à zéro. Chaque fois que le compte correspond au code produit par le dispositif, le compteur est incrémenté. Si le compteur déborde (c.-à-d. si le compte dépasse 2 - 1) durant un intervalle prescrit, on considère que le dispositif fonctionne correctement.

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