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    Magnetic field sensor with shared path amplifier and analog-to-digital-converter
    1.
    发明授权
    Magnetic field sensor with shared path amplifier and analog-to-digital-converter 有权

    公开(公告)号：US10466298B2

    公开(公告)日：2019-11-05

    申请号：US15710136

    申请日：2017-09-20

    Applicant: Allegro MicroSystems, LLC

    Inventor： Virag V. Chaware ,  Aaron Cook ,  Craig S. Petrie

    IPC: G01R27/26 ,  G01R31/28 ,  G01R33/09 ,  G01R33/07 ,  G01R33/00 ,  G01D5/14 ,  G01D5/244 ,  G01R35/00 ,  G01R15/20

    Abstract: A magnetic field sensor comprises at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to an external magnetic field; a diagnostic circuit configured to generate a diagnostic signal, wherein the diagnostic signal is not dependent on a measured magnetic field; a signal path comprising an amplifier and an analog-to-digital converter for processing the measured magnetic field signal to generate a sensor output signal indicative of the external magnetic field during a measured time period and for processing the diagnostic signal during a diagnostic time period; and a switch coupled to receive the measured magnetic field signal and the diagnostic signal and direct the measured magnetic field signal to the signal path during the measured time period and direct the diagnostic signal to the signal path during the diagnostic time period.

    Efficient Signal Path Diagnostics For Safety Devices
    2.
    发明申请
    Efficient Signal Path Diagnostics For Safety Devices 审中-公开

    公开(公告)号：US20190113584A1

    公开(公告)日：2019-04-18

    申请号：US15782163

    申请日：2017-10-12

    Applicant: Allegro MicroSystems, LLC

    Inventor： Aaron Cook ,  Virag V. Chaware ,  Craig S. Petrie

    IPC: G01R33/00

    Abstract: An apparatus comprises a first measurement circuit having a first magnetic field sensing element to detect a measured magnetic field and produce a first signal representing the measured magnetic field, and a first signal processing circuit to process the first signal to produce a first processed signal. A second measurement circuit comprises a second magnetic field sensing element to detect a measured magnetic field and produce a second signal representing the measured magnetic field, and a second signal processing circuit to process the second signal to produce a second processed signal. A diagnostic processing circuit is coupled to receive the first signal and the second signal and configured to process the first signal during a first time period to produce a first diagnostic signal, and process the second signal during a second time period. A logic circuit determines if an error is present.

    Methods and Apparatus For Trimming A Magnetic Field Sensor
    3.
    发明申请
    Methods and Apparatus For Trimming A Magnetic Field Sensor 审中-公开
    用于修整磁场传感器的方法和装置

    公开(公告)号：US20170016965A1

    公开(公告)日：2017-01-19

    申请号：US14801997

    申请日：2015-07-17

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Virag V. Chaware ,  Jesse Lapomardo ,  David J. Haas

    IPC: G01R33/00 ,  G01R33/07

    CPC classification number: G01R33/0023 ,  G01R33/0017 ,  G01R33/0035 ,  G01R33/07

    Abstract: Method and apparatus for trimming a magnetic field sensor having a first magnetic field sensing element. In embodiments, trimming includes the use of a curve for normalized sensitivity of the first magnetic field sensing element derived from a first curve corresponding to current through a coil in a first direction at a first time to produce a field affecting the first magnetic field sensing element versus an external field and a second curve corresponding to current through the coil in a second direction opposite to the first direction at a second time to produce a field affecting the first magnetic field sensing element versus an external field.

    Abstract translation: 用于修整具有第一磁场感测元件的磁场传感器的方法和装置。 在实施例中，修整包括使用第一磁场感测元件的归一化灵敏度的曲线，该第一磁场感测元件在与第一曲线相对应的第一曲线的第一时间沿第一方向产生的电流产生影响第一磁场感测元件的场 相对于在第二时间处于与第一方向相反的第二方向上的通过线圈的电流的外部场和第二曲线，以产生影响第一磁场感测元件相对于外部场的场。

    CIRCUITS AND METHODS FOR REGULATOR DIAGNOSTICS
    6.
    发明申请
    CIRCUITS AND METHODS FOR REGULATOR DIAGNOSTICS 审中-公开

    公开(公告)号：US20190170832A1

    公开(公告)日：2019-06-06

    申请号：US15830107

    申请日：2017-12-04

    Applicant: Allegro MicroSystems, LLC

    Inventor： Vladimir Kravljaca ,  Virag V. Chaware ,  Jesse Lapomardo

    IPC: G01R33/00 ,  G05F1/575 ,  G05F1/595

    Abstract: Apparatus including a regulator configured to generate a regulated output and a diagnostic circuit configured to generate a diagnostic signal indicative of whether the regulator is able to maintain regulation is described. The regulator includes an amplifier having a first input responsive to a reference voltage, a second input responsive to a feedback signal associated with the regulated output, and an output at which a control voltage is provided and further includes a pass element controlled by the control voltage and coupled to a node which the regulated output is provided. The diagnostic circuit is responsive to the control voltage and to the reference voltage to generate the diagnostic signal. The regulator may be a voltage regulator or a current regulator and in some embodiments, the diagnostic signal takes the form of a composite signal indicative of whether a voltage regulator and whether a current regulator can maintain regulation.

    Magnetic field sensors having stray field rejection
    7.
    发明授权
    Magnetic field sensors having stray field rejection 有权

    公开(公告)号：US11163019B1

    公开(公告)日：2021-11-02

    申请号：US16985577

    申请日：2020-08-05

    Applicant: Allegro MicroSystems, LLC

    Inventor： Virag V. Chaware ,  Aaron Cook

    IPC: G01R33/00 ,  G01R33/07

    Abstract: Described embodiments provide a magnetic field sensor that includes first and second spaced magnetic field sensing elements that each generate a signal indicative of a magnetic field associated with a target. A switching module couples a first terminal of the first magnetic field sensing element having a first polarity to a first terminal of the second magnetic field sensing element having a polarity opposite the first polarity to generate a first combined signal. The switching module couples a second terminal of the first magnetic field sensing element having a polarity opposite the first polarity to a second terminal of the second magnetic field sensing element having the first polarity to generate a second combined signal. The switching module simultaneously couples the first and the second combined signals to an amplifier, which generates an output signal indicative of the magnetic field that has stray magnetic field effects cancelled.

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