公开(公告)号：US20190265071A1

公开(公告)日：2019-08-29

申请号：US15906125

申请日：2018-02-27

Applicant: NXP B.V.

Inventor： Jaap Ruigrok ,  Edwin Schapendonk ,  Stephan Marauska ,  Dennis Helmboldt ,  Marijn Nicolaas van Dongen

IPC: G01D5/16

Abstract: A system for determining angular position includes a magnet having at least four poles and an axis of rotation, wherein the magnet produces a magnetic field. A first magnetic field sensor produces a first output signal and a second magnetic field sensor produces a second output signal in response to the magnetic field. The magnetic field sensors are operated in a saturation mode in which the magnetic field sensors are largely insensitive to the field strength of the magnetic field. Thus, the first output signal is indicative of a first direction of the magnetic field and the second output signal is indicative of a second direction of the magnetic field. Methodology performed by a processing circuit entails combining the first and second output signals to obtain a rotation angle value of the magnet in which angular error from a stray magnetic field is at least partially canceled.

公开(公告)号：US10261138B2

公开(公告)日：2019-04-16

申请号：US15647709

申请日：2017-07-12

Applicant: NXP B.V.

Inventor： Stephan Marauska ,  Jörg Kock ,  Mark Isler ,  Harmut Matz ,  Dennis Helmboldt

IPC: G01R33/09 ,  H01L43/06 ,  H05K9/00 ,  G01R33/00 ,  G01R33/025

Abstract: A system comprises at least one magnetic field sensor having a magnetic sense element formed on a substrate. The sense element senses a magnetic field along a sense axis oriented in a first direction parallel to a surface of the substrate. A shield structure is formed on the substrate. The shield structure has first and second shield portions and the magnetic sense element is disposed between the shield portions. Each of the shield portions includes a body and first and second brim segments extending from opposing ends of the body. The body is aligned parallel to a second direction perpendicular to the first direction and parallel to the surface of the substrate. The brim segments are aligned substantially parallel to the first direction. The shield portions are arranged in mirror symmetry with the brim segments of each of the shield portions extending toward one another.

公开(公告)号：US20190079141A1

公开(公告)日：2019-03-14

申请号：US15703102

申请日：2017-09-13

Applicant: NXP B.V.

Inventor： Stephan Marauska ,  Jörg Kock ,  Hartmut Matz ,  Mark Isler ,  Dennis Helmboldt

IPC: G01R33/00 ,  G01D5/20

Abstract: A magnetic field sensor includes a magnetic sense element and a shield structure formed on a substrate. The shield structure fully encircles the magnetic sense element for suppressing stray magnetic fields along a first axis and a second axis, both of which are parallel to a surface of the substrate and perpendicular to one another. A magnetic field is oriented along a third axis perpendicular to the surface of the substrate, and the magnetic sense element is configured to sense a magnetic field along the first axis. A magnetic field deflection element, formed on the substrate proximate the magnetic sense element, redirects the magnetic field from the third axis into the first axis to be sensed as a measurement magnetic field by the magnetic sense element. At least two magnetic field sensors, each fully encircled by a shield structure, form a gradient unit for determining a magnetic field gradient.