US 11,719,527 B2
Angle sensor with a single die using a single target
Rémy Lassalle-Balier, Bures sur Yvette (FR)
Assigned to Allegro MicroSystems, LLC, Manchester, NH (US)
Filed by Allegro MicroSystems, LLC, Manchester, NH (US)
Filed on Nov. 4, 2021, as Appl. No. 17/453,577.
Prior Publication US 2023/0134025 A1, May 4, 2023
Int. Cl. G01B 7/30 (2006.01); G01D 5/14 (2006.01); G01R 33/07 (2006.01)
CPC G01B 7/30 (2013.01) [G01D 5/142 (2013.01); G01R 33/077 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An angle sensor comprising:
magnetic-field sensing elements comprising:
a first pair of magnetic-field sensing elements,
a second pair of magnetic-field sensing elements;
a third pair of magnetic-field sensing elements;
a fourth pair of magnetic-field sensing elements; and
processing circuitry configured to determine an angle of a rotating ring magnet having a plurality of North-South pole pairs each having a unique period length, the processing circuitry comprises:
a first bridge formed from the first and second pairs of magnetic-field sensing elements; and
a second bridge formed from the third and fourth pairs of magnetic-field sensing elements;
wherein the angle includes a value from 0° to 360°,
wherein the first, second, third and fourth pairs of magnetic-field sensing elements are each disposed on a first axis,
wherein the first, second, third and fourth pairs of magnetic-field sensing elements each have a sensitivity in a first direction along the first axis,
wherein the angle sensor is formed on a single die,
wherein the angle sensor is an off-axis angle sensor or a side-shaft angle sensor,
wherein the first pair of magnetic-field sensing elements are on a first position on the first axis,
wherein the second pair of magnetic-field sensing elements are on a second position on the first axis,
wherein the third pair of magnetic-field sensing elements are on a third position on the first axis; and
wherein the fourth pair of magnetic-field sensing elements are on a fourth position on the first axis.