Hysteresis offset cancellation for magnetic sensors
US9046562B2 · kind B2 · utility
19Cited by
36References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2012 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Jun 11, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/207
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Presented is a sensor that includes a magnetoresistive (MR) sensing device to sense a magnetic field and to produce an AC signal voltage proportional to the sensed magnetic field. The sensor also includes circuitry, coupled to the MR sensing device, to remove DC offset from the AC signal voltage. The DC offset may be related to the hysteresis characteristics of the MR sensing device. To remove DC offset, the circuitry may obtain an averaged DC offset and subtract the averaged DC offset from the AC signal voltage to produce a sensor output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.