Apparatus for testing magnetic field sensor on wafer and method thereof
First Claim
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1. A method for testing a magnetic field sensor on a wafer, the method comprising:
- arranging the magnetic field sensor inside a magnetic field of a coil having a radial direction parallel to a surface of the wafer,wherein the magnetic field sensor is arranged away from a center point of the coil by a distance,wherein the coil has a cross-sectional area smaller than a cross-sectional area of the wafer, andwherein the coil is configured to apply a three-axis magnetic field to the magnetic field sensor, and the distance corresponds to a distance between the coil and the wafer such that the magnetic field sensor contacts magnetic field lines generated from the three-axis magnetic field having an incident angle of approximately 45 degrees between a Z axis and an XY coordinate plane, at a point at which the magnetic field lines meet the surface of the wafer; and
detecting the three-axis magnetic field applied to the magnetic field sensor,wherein the coil is a single coil used in applying the three-axis magnetic field to the magnetic field sensor, andwherein in response to the three-axis magnetic field applied to the magnetic field sensor being separated into X, Y, and Z axis components, the X, Y, and Z axis components have similar values.
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Abstract
An apparatus and a method for testing a magnetic field sensor are provided, in which the method includes arranging a coil for generating a magnetic field, applying the magnetic field to the magnetic field sensor using the coil, and detecting the magnetic field applied to the magnetic field sensor.
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Citations
15 Claims
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1. A method for testing a magnetic field sensor on a wafer, the method comprising:
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arranging the magnetic field sensor inside a magnetic field of a coil having a radial direction parallel to a surface of the wafer, wherein the magnetic field sensor is arranged away from a center point of the coil by a distance, wherein the coil has a cross-sectional area smaller than a cross-sectional area of the wafer, and wherein the coil is configured to apply a three-axis magnetic field to the magnetic field sensor, and the distance corresponds to a distance between the coil and the wafer such that the magnetic field sensor contacts magnetic field lines generated from the three-axis magnetic field having an incident angle of approximately 45 degrees between a Z axis and an XY coordinate plane, at a point at which the magnetic field lines meet the surface of the wafer; and detecting the three-axis magnetic field applied to the magnetic field sensor, wherein the coil is a single coil used in applying the three-axis magnetic field to the magnetic field sensor, and wherein in response to the three-axis magnetic field applied to the magnetic field sensor being separated into X, Y, and Z axis components, the X, Y, and Z axis components have similar values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for testing a magnetic field sensor, comprising:
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a wafer comprising at least four magnetic field sensors; and a ring-shaped coil having a radial direction parallel to surfaces of the magnetic field sensors, wherein the ring-shaped coil has a cross-sectional area smaller than a cross-sectional area of the wafer, wherein the magnetic field sensors are arranged inside a magnetic field of the ring-shaped coil by arranging a magnetic field sensor in each quadrant of a coil region of the ring-shaped coil for simultaneous testing, wherein the magnetic field sensors are each positioned away from a center point of the ring-shaped coil by a distance, such that the ring-shaped coil is configured to apply a three-axis magnetic field to the magnetic field sensors, wherein the ring-shaped coil is a single coil used in applying the three-axis magnetic field to the magnetic field sensor, wherein in response to the three-axis magnetic field applied to the magnetic field sensor being separated into X, Y, and Z axis components, the X, Y, and Z axis components have similar values, and wherein the distance corresponds to a distance between the coil and the wafer such that the magnetic field sensors contact magnetic field lines generated from the three-axis magnetic field having an incident angle of approximately 45 degrees between a Z-axis and an XY coordinate plane. - View Dependent Claims (14)
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15. A method for testing multi-axis magnetic field sensors on a wafer, the method comprising:
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positioning the multi-axis magnetic field sensors inside a magnetic field of a coil having a radial direction parallel to a surface of the wafer and separated away from a center point of the coil by a distance, such that the coil is configured to apply a multi-axis magnetic field to the multi-axis magnetic field sensors, and a magnetic field sensor is arranged in each quadrant of the coil for testing; and detecting the multi-axis components of the multi-axis magnetic field using the multi-axis magnetic field sensors, wherein; the coil has a cross-sectional area smaller than a cross-sectional area of the wafer, and the coil is a single coil used in applying a three-axis magnetic field to the magnetic field sensor, in response to the three-axis magnetic field applied to the magnetic field sensor being separated into X, Y, and Z axis components, the X, Y, and Z axis components have similar values, and the distance corresponds to a distance between the coil and the wafer such that the magnetic field sensors contact magnetic field lines generated from the three-axis magnetic field having an incident angle of approximately 45 degrees between a Z-axis and an XY coordinate plane.
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Specification