Magnetic field sensor with automatic sensitivity adjustment
US7923996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2008 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Mar 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0041
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Magnetic field sensors have a magnetic field sensing element and also a feedback circuit to provide a gain-adjustment signal to affect a sensitivity associated with the magnetic field sensing element. In some arrangements, the feedback circuit can include piezoresistors to sense a strain of a substrate over which the magnetic field sensor is disposed. With these arrangements, the feedback circuit can generate the gain-adjustment signal in accordance with the sensed strain. In other arrangements, the feedback circuit can generate pulsed magnetic fields proximate to the magnetic field sensing element in order to directly measure the sensitivity of the magnetic field sensing element. With these arrangements, the feedback circuit can generate the gain-adjustment signal in accordance with the sensed sensitivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.