High-sensitivity push-pull bridge magnetic sensor
US9885764B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2014 |
| Grant date | Feb 6, 2018 |
| Priority date | — |
| Expiry date | Dec 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/096
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high sensitivity push-pull bridge magnetic sensor, wherein the sensor comprises two substrates, magnetoresistive sense elements, push-arm flux concentrators, and pull-arm flux concentrators, wherein the magnetization directions of the pinning layers of the magnetoresistive sense elements on the same substrate are the same, but are opposite to the magnetization directions of the pinning layers of the magnetoresistive sense elements on the adjacent substrate, and the magnetoresistive sense elements on one substrate are electrically interconnected to form a push-arm of the bridge, and the magnetoresistive sense elements on the other substrate are electrically interconnected to form a pull-arm of the bridge. The magnetoresistive sense elements on the push-arm and pull-arm are aligned respectively in the gaps between two adjacent push-arm flux concentrators and two adjacent pull-arm flux concentrators. This sensor can be implemented as a quasi-bridge structure, a half-bridge structure, or a full-bridge structure. The sensor has the advantages of small offset, high sensitivity, excellent linearity, and low noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.