发明授权
- 专利标题: DC offset removal for a magnetic field sensor
- 专利标题(中): 用于磁场传感器的直流偏移去除
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申请号: US12038119申请日: 2008-02-27
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公开(公告)号: US08269491B2公开(公告)日: 2012-09-18
- 发明人: John Cummings , William P. Taylor , David J. Haas
- 申请人: John Cummings , William P. Taylor , David J. Haas
- 申请人地址: US MA Worcester
- 专利权人: Allegro Microsystems, Inc.
- 当前专利权人: Allegro Microsystems, Inc.
- 当前专利权人地址: US MA Worcester
- 代理机构: Daly, Crowley, Mofford & Durkee, LLP
- 主分类号: G01R33/09
- IPC分类号: G01R33/09 ; G01N27/72
摘要:
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.
公开/授权文献
- US20090212771A1 HYSTERESIS OFFSET CANCELLATION FOR MAGNETIC SENSORS 公开/授权日:2009-08-27