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    Circuits and methods for modulating current in circuits comprising sensing elements
    12.
    发明授权
    Circuits and methods for modulating current in circuits comprising sensing elements 有权
    用于调制包括感测元件的电路中的电流的电路和方法

    公开(公告)号：US09523742B2

    公开(公告)日：2016-12-20

    申请号：US14696674

    申请日：2015-04-27

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Jay M. Towne ,  P. Karl Scheller ,  Eric G. Shoemaker

    IPC: G01R33/06 ,  G01R33/07 ,  G01R33/09 ,  G01R33/00 ,  H03F1/02 ,  H03G1/00 ,  G01D5/14

    CPC classification number: G01R33/0041 ,  G01D5/145 ,  G01R33/0029 ,  G01R33/07 ,  G01R33/09 ,  H03F1/0216 ,  H03G1/0035

    Abstract: A circuit includes a current source having at least first terminal and a second, control terminal. The current source is configured to receive a current control signal at the control terminal and in response thereto generates a first current signal at the first terminal. The current control signal controls a current level of the first current signal. The circuit also includes at least one sensing element responsive to one or more sense parameters and having an input adapted to couple to the first terminal of said current source. The sensing element is configured to receive one or more current signals comprising at least the first current signal and in response thereto generates a sensed output signal at an output thereof. A corresponding method for operating the circuit is also provided.

    Abstract translation: 电路包括至少具有第一端子和第二控制端子的电流源。 电流源被配置为在控制终端处接收电流控制信号，并响应于此，在第一终端产生第一电流信号。 电流控制信号控制第一电流信号的电流电平。 电路还包括响应于一个或多个感测参数并且具有适于耦合到所述电流源的第一端子的输入的至少一个感测元件。 感测元件被配置为接收包括至少第一电流信号的一个或多个电流信号，并且作为响应，感测元件在其输出处产生感测的输出信号。 还提供了用于操作电路的相应方法。

    Magnetic field sensors having virtual signals
    15.
    发明授权
    Magnetic field sensors having virtual signals 有权

    公开(公告)号：US10578679B2

    公开(公告)日：2020-03-03

    申请号：US16010969

    申请日：2018-06-18

    Applicant: Allegro MicroSystems, LLC

    Inventor： Timothy Sitorus ,  Eric G. Shoemaker

    IPC: G01R33/00 ,  G01R33/09 ,  G01R33/07 ,  G01D5/245

    Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. In embodiments, the virtual magnetic field signal has the second predetermined phase difference with respect to each of the at least two measured magnetic field signals.

    Arrangements for magnetic field sensors to cancel offset variations
    16.
    发明授权
    Arrangements for magnetic field sensors to cancel offset variations 有权

    公开(公告)号：US10260905B2

    公开(公告)日：2019-04-16

    申请号：US15176655

    申请日：2016-06-08

    Applicant: Allegro MicroSystems, LLC

    Inventor： Paul A. David ,  Eric G. Shoemaker ,  Jeffrey Eagen

    IPC: G01D5/14 ,  G01D5/16

    Abstract: A magnetic field sensor can sense a movement of an object along a path. A movement line is tangent to the path. The magnetic field sensor can include a semiconductor substrate. The semiconductor substrate can have first and second orthogonal axes orthogonal to each other on the first surface of the substrate. A projection of the movement line onto a surface of the semiconductor substrate is only substantially parallel to the first orthogonal axis. The magnetic field sensor can also include first, second, third, and fourth magnetic field sensing elements disposed on the substrate. The first and second magnetic field sensing elements have maximum response axes parallel to the first orthogonal axis and the second and fourth magnetic field sensing elements have maximum response axes parallel to the second orthogonal axis. Signals generated by the second and fourth magnetic field sensing elements can be used as reference signals.

    ARRANGEMENTS FOR MAGNETIC FIELD SENSORS THAT ACT AS MOVEMENT DETECTORS
    17.
    发明申请
    ARRANGEMENTS FOR MAGNETIC FIELD SENSORS THAT ACT AS MOVEMENT DETECTORS 审中-公开

    公开(公告)号：US20170356761A1

    公开(公告)日：2017-12-14

    申请号：US15176665

    申请日：2016-06-08

    Applicant: Allegro MicroSystems, LLC

    Inventor： Ravi Vig ,  Paul A. David ,  Eric G. Shoemaker

    IPC: G01D5/14

    CPC classification number: G01D5/142 ,  G01D5/147

    Abstract: Magnetic field sensors can sense speed of movement and direction of movement of a ferromagnetic object. The magnetic field sensors employ both planar Hall effect elements and vertical Hall effect elements to generate two-state signals in two different signal paths with relative phases that are ninety degrees apart, the ninety degrees having sufficient margin to aid in detection of the direction of motion. Other magnetic field sensors use at least four vertical Hall effect elements to identify a speed of rotation and a direction of rotation of a moving ferromagnetic object.

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