发明申请
- 专利标题： Magnetic Field Sensor with Improved Differentiation Between a Sensed Magnetic Field Signal and a Noise Signal
- 专利标题（中）： 磁场传感器与传感磁场信号与噪声信号之间的差异化
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申请号： US12845115申请日： 2010-07-28
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公开(公告)号： US20120025817A1公开(公告)日： 2012-02-02
- 发明人: Hernan D. Romero , Gerardo Monreal
- 申请人： Hernan D. Romero , Gerardo Monreal
- 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
- 主分类号： G01R33/06
- IPC分类号： G01R33/06
摘要：
A magnetic field sensor includes a Hall element configured to generate a Hall element output signal in response to a magnetic field, the Hall element output signal comprising a magnetic field signal component and an offset signal component. The magnetic field sensor also includes a Hall element modulation circuit coupled to receive the Hall element output signal and configured to generate a modulation circuit output signal. The Hall element modulation circuit is modulated with a modulation signal having a changing modulation frequency that changes between a minimum frequency and a maximum frequency.