Patent ID: 9739847
Date: 2017-08-22
CPC Classifications: G01D,G01R,H02K

Claim:
1. A magnetic field sensor, comprising: a circular vertical Hall (CVH) sensing element comprising a plurality of vertical Hall elements, each vertical Hall element comprised of a respective group of vertical Hall element contacts selected from among a plurality of vertical Hall element contacts, the plurality of vertical Hall element contacts arranged over a common implant region in a semiconductor substrate, adjacent ones of the plurality of contacts at predetermined angles from each other; a CVH output stage comprising one or more drive circuits to drive the plurality of vertical Hall elements and produce an analog signal representing a strength of an external magnetic field as detected by the plurality of vertical Hall elements; an analog-to-digital converter coupled to receive the analog signal and produce a digital signal; a quadrature modulator circuit coupled to the digital signal and operable to generate a plurality of quadrature modulated signals; and a processor stage coupled to receive signals representative of the plurality of quadrature modulated signals and operable to compute an estimated angle of the external magnetic field.