Method and apparatus for detecting slow and small changes of...

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G01R 19/165 (2006.01) G01R 19/00 (2006.01) G01R 31/36 (2006.01)

Patent

CA 2379639

A method and electronic circuit for detecting slow and small changes of electrical signal including the sign of the changes, comprising the steps of switching the signal to be detected periodically to a capacitor and changing thereby its charge state taken in the previous period, examining the extent and sign of the decaying current pulse caused when said capacitor has been forced to take the new charge state, if the extent of this decaying current pulse is higher than a predetermined threshold limit, storing this fact and the sign of the change till the next period.

La présente invention concerne un procédé et un montage électronique de détection, d'une part de petites variations lentes affectant un signal électrique, et d'autre part du signe de ces variations. En l'occurrence, on commence par commuter le signal à détecter périodiquement sur un condensateur, ce qui fait varier l'état de charge qui avait été pris dans la période précédente. On observe la quantité et le signe de l'impulsion à intensité décroissante une fois que le condensateur a été forcé à prendre le nouvel état de charge. Si la quantité de l'impulsion à intensité décroissante est supérieure à une limite de seuil définie, on consigne ce fait et le signe de la variation jusqu'à la période suivante.

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