Patent ID: 8933523
Filing Date: 2015-01-13
Classification: G01R,H01L

Abstract:
1. A referenced full-bridge magnetic field sensor chip comprising two reference arms and two sensing arms that are spatially interleaved and electrically interconnected to form a Wheatstone bridge, wherein each reference arm includes one or more MTJ or GMR magnetoresistive reference elements, and each sensing arm includes one or more MTJ or GMR magnetoresistive sensing elements, said sensing elements utilize the portion of a transfer curve that is linearly dependent on an applied magnetic field; said reference arm sensitivity is less than said sensor arm sensitivity wherein a relative resistance of the sensing and reference arms is adjusted by varying the number of the MTJ or GMR magnetoresistive sensing elements; wherein the reference arms and sensing arms are fabricated simultaneously utilizing the same fabrication process steps in order to enhance the temperature stability and the uniformity of said referenced full-bridge magnetic field sensor chip; and a set of bond pads used to electrically connect said referenced full-bridge sensor chip to an ASIC or to the lead frame of a semiconductor package.