Magnetic field sensing apparatus

G - Physics – 01 – R

Patent

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G01R 33/04 (2006.01) G01D 5/16 (2006.01) G01R 33/09 (2006.01) G06K 7/08 (2006.01) H01L 43/08 (2006.01) H03K 17/95 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1040268

A B S T R A C T Apparatus for producing an output signal upon sensing a magnetic field. The apparatus comprises a magnetoresistive element which has an insulating substrate and first and second ferromagnetic strips on the substrate for providing first and second main current conducting paths which are perpendicular to each other, the strips being connected in series to define a junction therebetween; impedance elements connected in parallel with the series-connected strips to form a bridge circuit wherein the junction between the strips comprises a bridge output terminal; and a generator magnet for producing a magnetic field has a surface disposed in a plane spaced from the magnet- oresistive element to produce an output signal from the bridge circuit as a function of the relative positions of leading and trailing edges of the generator magnet with respect to a leading edge of the magnetoresistive element.

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