Monolithic magnetic sensor having externally adjustable temperat

Electricity: measuring and testing – Magnetic – Magnetometers

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32420712, 3242072, 324225, 323368, 327511, G01R 3307, H01L 4306, H03K 1795

Patent

active

061540277

ABSTRACT:
The current flow from a temperature-variable current source to a Hall-effect element is adjusted according to sensed temperature conditions of the element to compensate for temperature-dependent changes in the magnetic-field sensitivity of the Hall-effect element and in the magnitude of the permanent magnetic fields of magnetic components sensed by the element. A trimmable resistor is connected between two external terminals of a Monolithically integrated circuit to provide external control over the sensitivity of the temperature variable current source to changing temperature conditions. The device also alternately switches the quadrature states of output and bias supply contacts of the Hall-effect element to compensate for the offset and drift thereof.

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Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation, A. Bilotti, Life Senior Member, IEEE Journal of Solid State Circuits, vol. 32, No. 6, Jun. 1997.

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