Invention Grant
US09541424B2 Circuits and methods for processing signals generated by a circular vertical hall (CVH) sensing element in the presence of a multi-pole magnet
有权
用于在存在多极磁体的情况下处理由圆形垂直霍尔(CVH)感测元件产生的信号的电路和方法
- Patent Title: Circuits and methods for processing signals generated by a circular vertical hall (CVH) sensing element in the presence of a multi-pole magnet
- Patent Title (中): 用于在存在多极磁体的情况下处理由圆形垂直霍尔(CVH)感测元件产生的信号的电路和方法
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Application No.: US15186433Application Date: 2016-06-18
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Publication No.: US09541424B2Publication Date: 2017-01-10
- Inventor: Andreas P. Friedrich , Andrea Foletto
- Applicant: Allegro MicroSystems, LLC
- Applicant Address: US MA Worcester
- Assignee: Allegro MicroSystems, LLC
- Current Assignee: Allegro MicroSystems, LLC
- Current Assignee Address: US MA Worcester
- Agency: Daly, Crowley, Mofford and Durkee, LLP
- Main IPC: G01R33/07
- IPC: G01R33/07 ; G01D5/14

Abstract:
Described embodiments provide a magnetic field sensor has a circular vertical Hall (CVH) sensing element with a plurality of vertical Hall elements disposed over a common implant region in a substrate. The magnetic field sensor generates output signals responsive to a magnetic field generated by a multi-pole magnet having a plurality of north poles and also a plurality of south poles. An angle sensor generates an angle signal representative of an angle of a direction component of the magnetic field. A pole pair counter generates a count signal representative of a count of a number of the pole pairs of the multi-pole magnet that move past the CVH sensing element. An angle interpolation module generates a reconstructed angle signal representative of an angular position of the multi-pole magnet relative to the CVH sensing element based upon the count signal and the angle signal. Corresponding methods are also described.
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