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Title:
Method for reducing the offset voltage of a hall device
Document Type and Number:
WIPO Patent Application WO1998010302
Kind Code:
A3
Abstract:
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 DEG . 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 DEG . Superposition of the supplied currents results in a continuously spinning current vector in the Hall device. By measuring simultaneously the voltages (VAC, VBD) between corresponding terminals, a signal (VHO) consisting of the Hall voltage and a periodic offset voltage can be isolated. The offset voltage (VO) is eliminated by averaging the signal over at least one period.

Inventors:
STEINER RALPH (CH)
HAEBERLI ANDREAS (CH)
STEINER FRANZ-PETER (CH)
MAIER CHRISTOPH (CH)
Application Number:
PCT/EP1997/004932
Publication Date:
June 18, 1998
Filing Date:
September 09, 1997
Export Citation:
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Assignee:
PHYSICAL ELECTRONICS LAB (CH)
STEINER RALPH (CH)
HAEBERLI ANDREAS (CH)
STEINER FRANZ-PETER (CH)
MAIER CHRISTOPH (CH)
International Classes:
G01R33/07; H01L43/06; (IPC1-7): G01R33/07
Foreign References:
DE4302342A11993-07-29
US4668914A1987-05-26
US4037150A1977-07-19
Other References:
MUNTER P J A: "ELECTRONIC CIRCUITRY FOR A SMART SPINNING-CURRENT HALL PLATE WITH LOW OFFSET", SENSORS AND ACTUATORS A, vol. A27, no. 1 - 03, 1 May 1991 (1991-05-01), pages 747 - 751, XP000216815
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