Patent ID: 8129988
Filing Date: 2012-03-06
Classification: G01R

Abstract:
1. A method of adjusting the sensitivity of a device including a magneto-resistive sensor and increasing the range of response of that device to an external magnetic field, characterized in that it consists in applying a known predetermined magnetic bias field H bias that is not homogeneous and is subject to known variations between a minimum value H biasmin and a maximum value H biasmax in a direction such that it has a non-zero component of the field perpendicular to a detection direction of said magnetoresistive sensor that also corresponds to a direction of anisotropy of a layer of the magnetoresistive sensor, so that the magnetic field to be measured can be determined by a monotonic function from the resistance variation of said magneto-resistive sensor, wherein the bias magnetic field is caused to vary linearly between the minimum value H wherein the resistance R of said magnetoresistive sensor is given by the following equation: where: R R H is the external magnetic field to be measured; and u is the variable varying from the minimum value H