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    • 7. 发明申请
    • A MAGNETIC FIELD SENSOR CIRCUIT
    • 一种磁场传感器电路
    • WO2008065574A2
    • 2008-06-05
    • PCT/IB2007054705
    • 2007-11-20
    • NXP BVDURIC HARISIKKINK TEUNIS JANBOEVE HANS MARC BERT
    • DURIC HARISIKKINK TEUNIS JANBOEVE HANS MARC BERT
    • G01R33/093B82Y25/00G01R33/096
    • A magnetic field sensor circuit comprises a first magneto -resistive sensor (Rx) which senses a first magnetic field component in a first direction to supply a first sense signal (Vx). A first flipping coil (FC1) applies a first flipping magnetic field with a periodically changing polarity to the first magneto -resistive sensor (Rx) to cause the first sense signal (Vx) to have alternating different levels synchronized with the first flipping magnetic field. A second magneto -resistive sensor (Ry) senses a second magnetic field component in a second direction different than the first direction to supply a second sense signal (Vy). A second flipping coil (FC2) applies a second flipping magnetic field with a periodically changing polarity to the second magneto -resistive sensor (Ry) to cause the second sense signal (Vy) to have an alternating different levels synchronized with the second flipping magnetic field. The first flipping magnetic field and the second flipping magnetic field have a phase shift. A differential amplifier (AMPl) receives the first sense signal (Vx) and the second sense signal (Vy) to obtain a difference signal (Vd). A first synchronous demodulator (DEM1) receives the difference signal (Vd) and a first switching signal (Q1) being phase locked to the alternating different levels of the first sense signal (Vx) to supply a first output signal (Vox) indicating the first magnetic field component. A second synchronous demodulator (DEM2) receives the difference signal (Vd) and a second switching signal (Q2) being phase locked to the alternating different levels of the second sense signal (Vy) to supply a second output signal (Voy) indicating the second magnetic field component.
    • 磁场传感器电路包括第一磁阻传感器(Rx),其感测第一方向上的第一磁场分量以提供第一感测信号(Vx)。 第一翻转线圈(FC1)向第一磁阻传感器(Rx)施加具有周期性变化极性的第一翻动磁场,以使第一感测信号(Vx)具有与第一翻动磁场同步的交替不同的电平。 第二磁阻传感器(Ry)在不同于第一方向的第二方向上感测第二磁场分量以提供第二感测信号(Vy)。 第二翻转线圈(FC2)向第二磁阻传感器(Ry)施加具有周期性变化的极性的第二翻动磁场以使第二感测信号(Vy)具有与第二翻转磁场同步的交替的不同电平 。 第一翻转磁场和第二翻动磁场具有相移。 差分放大器(AMP1)接收第一感测信号(Vx)和第二感测信号(Vy)以获得差信号(Vd)。 第一同步解调器(DEM1)接收差分信号(Vd)和被锁相到第一感测信号(Vx)的交替不同电平的第一切换信号(Q1),以提供指示第一输出信号 磁场分量。 第二同步解调器(DEM2)接收差分信号(Vd)和被锁相到第二感测信号(Vy)的交替不同电平的第二开关信号(Q2),以提供指示第二输出信号 磁场分量。
    • 8. 发明申请
    • A MAGNETIC FIELD SENSOR CIRCUIT
    • WO2008065574A3
    • 2008-06-05
    • PCT/IB2007/054705
    • 2007-11-20
    • NXP B.V.DURIC, HarisIKKINK, Teunis, JanBOEVE, Hans, Marc, Bert
    • DURIC, HarisIKKINK, Teunis, JanBOEVE, Hans, Marc, Bert
    • G01R33/02G01R33/09
    • A magnetic field sensor circuit comprises a first magneto -resistive sensor (Rx) which senses a first magnetic field component in a first direction to supply a first sense signal (Vx). A first flipping coil (FC1) applies a first flipping magnetic field with a periodically changing polarity to the first magneto -resistive sensor (Rx) to cause the first sense signal (Vx) to have alternating different levels synchronized with the first flipping magnetic field. A second magneto -resistive sensor (Ry) senses a second magnetic field component in a second direction different than the first direction to supply a second sense signal (Vy). A second flipping coil (FC2) applies a second flipping magnetic field with a periodically changing polarity to the second magneto -resistive sensor (Ry) to cause the second sense signal (Vy) to have an alternating different levels synchronized with the second flipping magnetic field. The first flipping magnetic field and the second flipping magnetic field have a phase shift. A differential amplifier (AMPl) receives the first sense signal (Vx) and the second sense signal (Vy) to obtain a difference signal (Vd). A first synchronous demodulator (DEM1) receives the difference signal (Vd) and a first switching signal (Q1) being phase locked to the alternating different levels of the first sense signal (Vx) to supply a first output signal (Vox) indicating the first magnetic field component. A second synchronous demodulator (DEM2) receives the difference signal (Vd) and a second switching signal (Q2) being phase locked to the alternating different levels of the second sense signal (Vy) to supply a second output signal (Voy) indicating the second magnetic field component.