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公开(公告)号：US09606144B2
公开(公告)日：2017-03-28
申请号：US14687490
申请日：2015-04-15
Applicant: Everspin Technologies, Inc.
Inventor： Lianjun Liu , Phillip Mather
CPC classification number: G01R1/07307 , G01R33/0035 , G01R33/09 , G01R35/00
Abstract: A probe card and method are provided for testing magnetic sensors at the wafer level. The probe card has one or more probe tips having a first pair of solenoid coils in parallel configuration on first opposed sides of each probe tip to supply a magnetic field in a first (X) direction, a second pair of solenoid coils in parallel configuration on second opposed sides of each probe tip to supply a magnetic field in a second (Y) direction orthogonal to the first direction, and an optional third solenoid coil enclosing or inscribing the first and second pair to supply a magnetic field in a third direction (Z) orthogonal to both the first and second directions. The first pair, second pair, and third coil are each symmetrical with a point on the probe tip array, the point being aligned with and positioned close to a magnetic sensor during test.
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公开(公告)号：US09766301B2
公开(公告)日：2017-09-19
申请号：US14953572
申请日：2015-11-30
Applicant: EVERSPIN TECHNOLOGIES, INC.
Inventor： Lianjun Liu , Phillip Mather , Jon Slaughter
CPC classification number: G01R33/0029 , G01R33/0041 , G01R33/04 , G01R33/098
Abstract: A magnitude and direction of at least one of a reset current and a second stabilization current (that produces a reset field and a second stabilization field, respectively) is determined that, when applied to an array of magnetic sense elements, minimizes the total required stabilization field and reset field during the operation of the magnetic sensor and the measurement of the external field. Therefore, the low field sensor operates optimally (with the highest sensitivity and the lowest power consumption) around the fixed external field operating point. The fixed external field is created by other components in the sensor device housing (such as speaker magnets) which have a high but static field with respect to the low (earth's) magnetic field that describes orientation information.
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3.发明授权公开(公告)号：US09229070B2
公开(公告)日：2016-01-05
申请号：US14533842
申请日：2014-11-05
Applicant: EVERSPIN TECHNOLOGIES, INC.
Inventor： Lianjun Liu , Philip Mather , Jon Slaughter
CPC classification number: G01R33/0029 , G01R33/0041 , G01R33/04 , G01R33/098
Abstract: A magnitude and direction of at least one of a reset current and a second stabilization current (that produces a reset field and a second stabilization field, respectively) is determined that, when applied to an array of magnetic sense elements, minimizes the total required stabilization field and reset field during the operation of the magnetic sensor and the measurement of the external field. Therefore, the low field sensor operates optimally (with the highest sensitivity and the lowest power consumption) around the fixed external field operating point. The fixed external field is created by other components in the sensor device housing (such as speaker magnets) which have a high but static field with respect to the low (earth's) magnetic field that describes orientation information.
Abstract translation: 确定复位电流和第二稳定电流（分别产生复位场和第二稳定场）中的至少一个的幅度和方向，当应用于磁感测元件的阵列时，使总要求的稳定性最小化 在磁传感器运行期间的场和复位场以及外场测量。 因此，低场传感器在固定的外场操作点周围最佳地运行（具有最高的灵敏度和最低的功耗）。 固定的外部场是由传感器装置外壳（例如扬声器磁体）中的其他部件产生的，这些部件相对于描述取向信息的低（地球）磁场具有高但静止的场。
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公开(公告)号：US09588211B2
公开(公告)日：2017-03-07
申请号：US14658757
申请日：2015-03-16
Applicant: Everspin Technologies, Inc.
Inventor： Lianjun Liu , Phillip Mather
CPC classification number: G01R35/00 , G01R33/0011 , G01R33/093
Abstract: A method and apparatus eliminate magnetic domain walls in a flux guide by applying, either simultaneously or sequentially, a current pulse along serially positioned reset lines to create a magnetic field along the flux guide, thereby removing the magnetic domain walls. By applying the current pulses in parallel and stepping through pairs of shorter reset lines segments via switches, less voltage is required.
Abstract translation: 一种方法和装置通过同时或顺序地施加沿着串行位置的复位线的电流脉冲来消除磁通引导件中的磁畴壁，以沿着磁通导向器产生磁场，从而去除磁畴壁。 通过并联施加电流脉冲并通过开关逐步穿过较短的复位线段，需要更少的电压。
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