Patent ID: 9651636
Date: 2017-05-16
CPC Classifications: G01R

Claim:
1. A single-chip three-axis magnetic field sensing device comprising: a substrate including a horizontal surface along an x-y plane; an x-axis sensing module comprising at least one x-axis magnetoresistive element and configured to sense an x-axis magnetic field component substantially parallel to the horizontal surface; a y-axis sensing module comprising at least one y-axis magnetoresistive element and configured to sense a y-axis magnetic field component substantially parallel to the horizontal surface; a z-axis sensing module comprising at least one z-axis magnetoresistive element and configured to sense a z-axis magnetic field component substantially perpendicular to the horizontal surface; and a single coil, wherein the at least one z-axis magnetoresistive element and one of the at least one x-axis magnetoresistive element and the at least one y-axis magnetoresistive element are disposed directly above or directly below the single coil and the single coil is configured to set magnetization directions of the magnetoresistive elements directly above or directly below the single coil.