Patent ID: 10107871

Abstract:
A monolithic three-axis magnetic field sensor comprises an X-axis sensor, a Y-axis sensor and a Z-axis sensor integrated into the same substrate. The X-axis sensor and the Y-axis are both referenced bridge structures. The magnetoresistive sensing elements of the reference arm are beneath the corresponding magnetic flux guides, and the magnetoresistive sensing elements are in the gaps between the corresponding magnetic flux guides. The magnetoresistive elements of these two sensors are aligned perpendicular to each other, and the magnetization directions of the pinned layer of these magnetoresistive elements are perpendicular to each other as well. The Z-axis sensor is a push-pull bridge structure. The push arms and pull arms of the magnetoresistive sensors are respectively aligned above or beneath the edges of the magnetic flux guides. The manufacturing method for this monolithic three-axis magnetic field sensor is also disclosed.