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:
Jul. 19, 2011
Filed:
Jun. 26, 2007
Devon Fernandez, Manchester, NH (US);
Jeff Eagen, Amherst, NH (US);
Glenn A. Forrest, Bow, NH (US);
Mathew Drouin, Manchester, NH (US);
Devon Fernandez, Manchester, NH (US);
Jeff Eagen, Amherst, NH (US);
Glenn A. Forrest, Bow, NH (US);
Mathew Drouin, Manchester, NH (US);
Allegro Microsystems, Inc., Worcester, MA (US);
Abstract
A proximity detector employs a first peak detector circuit and a second peak detector circuit, both responsive to a magnetic field signal. The second peak detector circuit includes a positive peak detector circuit and a negative peak detector circuit, each of which have a predetermined excursion limit in an outward direction away from a center voltage of the magnetic field signal so as to be less affected by a large signature region in the magnetic field signal. The proximity detector also includes an output control circuit. The output control circuit is configured to provide an output signal, which, during a determined time period, changes state in response to the first peak detector circuit, and which, after the determined time period, changes state in response to the second peak detector circuit.