Method for reducing the offset voltage of a hall device

G - Physics – 01 – R

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G01R 33/07 (2006.01)

Patent

CA 2236861

The method serves for dynamically compensating the offset voltage of a Hall device. The Hall device can have either a platelike structure with at least two contact pairs (AC, BD), or any other arrangement deriveable by conformal mapping. The contact pairs (AC, BD) are angled by e.g. 90°. Each pair is supplied with a periodically alternating current whereby the phase shift of the supply currents corresponds to the spatial phase shift of the contact pairs and is e.g. 90°. Superposition of the supplied currents results in a continuously spinning current vector in the Hall device. By measuring simultaneously the voltages (V AC, V BD) between corresponding terminals, a signal (V HO) consisting of the Hall voltage and a periodic offset voltage can be isolated. The offset voltage (V O) is eliminated by averaging the signal over at least one period.

L'invention a pour objet un procédé pour compenser de manière dynamique la tension de décalage d'un dispositif Hall. Ce dernier peut avoir une structure de type plaque avec au moins deux paires de contacts (AC, BD), ou il peut présenter tout autre disposition pouvant être dérivée par cartographie. Les paires de contact (AC, BD) forment un angle de 90 DEG , par exemple. Chaque paire est alimentée en un courant alternatif, selon lequel le décalage de phase des courants d'alimentation correspond au décalage de phase spatiale des paires de contact, et forme un angle de 90 DEG . La superposition des courants fournis se traduit par un vecteur de courant tournant continu dans le dispositif Hall. En mesurant simultanément les tensions (VAC, VBD) entre les bornes correspondantes, un signal (VHO) se composant de la tension Hall et d'une tension de décalage périodique peut être isolé. Cette tension de décalage (VHO) est supprimée en moyennant le signal sur au moins une période.

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