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Circuits and Methods for Removing a Gain Offset in a Magnetic Field Sensor

Active Publication Date: 2017-02-02
ALLEGRO MICROSYSTEMS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a way to calibrate a magnetic field sensor while it is in use. The calibration is done regardless of the external magnetic field and helps to reduce or eliminate errors caused by feedback gain.

Problems solved by technology

Some calibration circuits have a feedback arrangement with a gain error.

Method used

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  • Circuits and Methods for Removing a Gain Offset in a Magnetic Field Sensor
  • Circuits and Methods for Removing a Gain Offset in a Magnetic Field Sensor
  • Circuits and Methods for Removing a Gain Offset in a Magnetic Field Sensor

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Embodiment Construction

[0063]Before describing the present invention, some introductory concepts and terminology are explained. As used herein, the term “magnetic field sensing element” is used to describe a variety of types of electronic elements that can sense a magnetic field. The magnetic field sensing elements can be, but are not limited to, Hall effect elements, magnetoresistance elements, or magnetotransistors. As is known, there are different types of Hall effect elements, for example, planar Hall elements, vertical Hall elements, and circular Hall elements. As is also known, there are different types of magnetoresistance elements, for example, anisotropic magnetoresistance (AMR) elements, giant magnetoresistance (GMR) elements, tunneling magnetoresistance (TMR) elements, Indium antimonide (InSb) elements, and magnetic tunnel junction (MTJ) elements.

[0064]As is known, some of the above-described magnetic field sensing elements tends to have an axis of maximum sensitivity parallel to a substrate th...

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Abstract

A magnetic field sensor and a method include a modulator coupled in a feedback arrangement and operable to modulate a calibration feedback signal with a modulator clock signal having a selected frequency and a selected relative phase operable to remove a gain error in the magnetic field sensor and in the method.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]Not Applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]Not Applicable.FIELD OF THE INVENTION[0003]This invention relates generally to magnetic field sensors and, more particularly, to magnetic field sensors having a feedback arrangement to calibrate a sensitivity of the magnetic field sensor and for removing a gain offset component in the magnetic field sensor.BACKGROUND OF THE INVENTION[0004]As is known, there are a variety of types of magnetic field sensing elements, including, but not limited to, Hall effect elements, magnetoresistance elements, and magnetotransistors. As is also known, there are different types of Hall effect elements, for example, planar Hall elements, vertical Hall elements, and circular Hall elements. As is also known, there are different types of magnetoresistance elements, for example, anisotropic magnetoresistance (AMR) elements, giant magnetoresistance (GMR) elements, tunneling magnetoresistance (...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01R33/00G01R33/07
CPCG01R33/0035G01R33/07G01R33/0017
Inventor CESARETTI, JUAN MANUEL
Owner ALLEGRO MICROSYSTEMS INC
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