Magnetic Sensor Chip Asymmetry for Angular Misalignment
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Solution Overview
Problem
Magnetic sensors face challenges in reducing angular misalignment, which affects the accuracy of magnetic field sensing and current measurement due to the mismatch between the bias magnetic field and the magnetic resistance device orientation.
Innovation Solution
A magnetic sensor design where the chip length in the magnetic sensing direction is twice or more than the length in the orthogonal direction, with bias magnets positioned to apply a uniform magnetic bias, reducing angular misalignment and enhancing the accuracy of magnetic field sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the chip is designed with equal length in magnetic sensing direction and orthogonal direction, then the device complexity is reduced, but angular misalignment increases
Solution Approach 1:
The patent applies asymmetry by designing the chip with a specific aspect ratio where the length in the magnetic sensing direction is twice or more than the length in the orthogonal direction. This asymmetric geometry inherently reduces angular misalignment effects without requiring additional complex alignment mechanisms, thus improving measurement precision while maintaining relatively simple device structure.
2Measurement precision
If the chip length in magnetic sensing direction is increased to reduce angular misalignment, then measurement precision improves, but the chip area increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the aspect ratio of the chip rather than uniformly increasing its size. By setting the length in the magnetic sensing direction to be twice or more than the orthogonal length, the design achieves reduced angular misalignment while controlling the overall chip area through proportional scaling rather than absolute enlargement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces angular misalignment, improves the symmetry of output signals, and miniaturizes the sensor while maintaining high accuracy in measuring magnetic fields and currents.
Implementation Method 1
a magnetic resistance device and a bias magnetic field generating section on the chip
Data Source
AI summary
A magnetic sensor senses a magnetic field in a predetermined magnetic sensing direction. The magnetic sensor includes a chip on which at least one magnetic device is provided. The length of the chip in the magnetic sensing direction is twice or more the length of the chip in an orthogonal direction that is orthogonal or substantially orthogonal to the magnetic sensing direction.