The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 2021
Filed:
Nov. 18, 2019
Allegro Microsystems, Llc, Manchester, NH (US);
Zachary Richards, Epsom, NH (US);
Allegro MicroSystems, LLC, Manchester, NH (US);
Abstract
A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other. A controller responsive to the measured magnetic field signals is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. The controller is configured to calculate a virtual tangent of the virtual magnetic field signal and at least one measured magnetic field signal and compute a second derivative of an arctangent extraction of the virtual tangent. Coefficients used to generate the virtual magnetic field signals are regulated in a feedback system in order to achieve a desired phase difference between a reference and a virtual magnetic field signal.