Arrangements for magnetic field sensors to cancel offset variations
US10260905B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2016 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Aug 1, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/776
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field sensor can sense a movement of an object along a path. A movement line is tangent to the path. The magnetic field sensor can include a semiconductor substrate. The semiconductor substrate can have first and second orthogonal axes orthogonal to each other on the first surface of the substrate. A projection of the movement line onto a surface of the semiconductor substrate is only substantially parallel to the first orthogonal axis. The magnetic field sensor can also include first, second, third, and fourth magnetic field sensing elements disposed on the substrate. The first and second magnetic field sensing elements have maximum response axes parallel to the first orthogonal axis and the second and fourth magnetic field sensing elements have maximum response axes parallel to the second orthogonal axis. Signals generated by the second and fourth magnetic field sensing elements can be used as reference signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.