Magnetic sensor with improved stress compensation accounting for temperature
US11402280B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2019 |
| Grant date | Aug 2, 2022 |
| Priority date | — |
| Expiry date | Jan 7, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor is provided with improved stress compensation accounting for temperature. The magnetic field sensor includes a stress sensing, element, a temperature sensing element, a magnetic field sensing element, a memory, and an electronic circuitry. The memory is configured to store a first table. The first table identities a plurality of stress-to-sensitivity coefficients. Each of the plurality of stress-to-sensitivity coefficients is mapped to a different temperature value. The electronic circuitry is configured to use a temperature reading and a stress reading to calculate a stress difference between an expected stress and the stress reading. The electronic circuitry is further configured to obtain a stress-to-sensitivity coefficient that corresponds to the temperature reading by using the first table, calculate a gain adjustment coefficient based an the stress-to-sensitivity coefficient, and adjust a gain of a signal that is generated by the magnetic field sensing element based on the grain adjustment coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.