公开(公告)号：US20150219689A1

公开(公告)日：2015-08-06

申请号：US14687490

申请日：2015-04-15

Applicant: Everspin Technologies, Inc.

Inventor： Lianjun LIU ,  Phillip MATHER

IPC: G01R1/073 ,  G01R35/00

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.

Abstract translation: 提供探针卡和方法来测试晶片级的磁性传感器。 探针卡具有一个或多个探针尖端，其具有在每个探针尖端的第一相对侧上并联配置的第一对螺线管线圈，以在第一（X）方向上提供磁场，第二对螺线管线圈以 每个探针尖端的第二相对侧在与第一方向正交的第二（Y）方向上提供磁场，以及可选的第三电磁线圈，其包围或刻写第一和第二对以在第三方向（Z ）与第一和第二方向正交。 第一对，第二对和第三线圈各自与探针尖端阵列上的点对称，在测试期间该点与磁性传感器对准并靠近磁性传感器。

公开(公告)号：US20160084920A1

公开(公告)日：2016-03-24

申请号：US14953572

申请日：2015-11-30

Applicant: EVERSPIN TECHNOLOGIES, INC.

Inventor： Lianjun LIU ,  Phillip MATHER ,  Jon SLAUGHTER

IPC: G01R33/00 ,  G01R33/09

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.

公开(公告)号：US20150192655A1

公开(公告)日：2015-07-09

申请号：US14658757

申请日：2015-03-16

Applicant: Everspin Technologies, Inc.

Inventor： Lianjun LIU ,  Phillip MATHER

IPC: G01R35/00

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。