High-speed a/d conversion using a series of one-bit...

H - Electricity – 03 – M

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Details

H03M 1/38 (2006.01) H03M 1/44 (2006.01)

Patent

CA 2071394

In an analog-to-digital converter, one-bit A/D conversion stages are connected in series to receive an analog signal. Each conversion stage includes a sample-and-hold circuit for sampling an analog signal from a preceding stage, a comparator for comparing it with a specified voltage level to produce a logic signal at one of two discrete levels depending on whether the signal received from the preceding stage is higher or lower than the specified level. The signal received from the preceding stage is summed with a prescribed reference voltage of one of opposite polarities depending on the level of the logic signal to produce an analog output signal. The successive conversion stages are driven so that the analog signal from each stage is transferred to the next, and the logic signals generated by the individual conversion stages are delayed so that they appear simultaneously at digital output terminals.

Dans un convertisseur analogique-numérique, des étages de conversion analogiques-numériques un bit sont connectés en série pour recevoir un signal analogique. Chaque étage de conversion comprend un circuit échantillonneur-bloqueur qui échantillonne un signal analogique provenant d'un étage en amont, un comparateur servant à comparer ce signal avec un niveau de tension spécifié pour produire un signal logique à l'un de deux niveaux discrets selon le niveau du signal reçu de l'étage en amont par rapport au niveau spécifié. Le signal reçu de l'étage en amont est additionné à une tension de référence prescrite dont le signe dépend du niveau du signal logique pour produire un signal de sortie analogique. Les étages de conversion successifs sont attaqués de façon à transmettre à l'étage suivant le signal de sortie analogique de chacun des étages, et à retarder les signaux logiques produits par les étages de conversion individuels de façon qu'ils arrivent simultanément aux bornes de sortie numériques.

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