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US 11,953,565 B2Granted
Electrical offset compensating in a bridge using more than four magnetoresistance elements
AssigneeAllegro MicroSystems, LLC
InventorHernán D. Romero
Life of this patent
Estimating the term…
Abstract
In one aspect, bridge circuitry includes a first magnetoresistance (MR) element connected with a second MR element at a first node; a third MR element connected with the first MR element at a second node; a fourth MR element connected with the third MR element at a third node; a fifth MR element connected with a sixth MR element at a fourth node; a seventh MR element connected with the fifth MR element at a fifth node; and an eighth MR element connected with the seventh MR element at a sixth node; and a plurality of eight switches. Six of the plurality of eight switches are each connected to a corresponding one node.
Claims33
Bridge circuitry comprising:
- a first magnetoresistance (MR) element;
- a second MR element connected in series with the first MR element at a first node;
- a third MR element connected in series with the second MR element at a second node;
- a fourth MR element connected in series with the third MR element at a third node;
- a fifth MR element;
- a sixth MR element connected in series with the fifth MR element at a fourth node;
- a seventh MR element connected in series with the sixth MR element at a fifth node;
- an eighth MR element connected in series with the seventh MR element at a sixth node;
- a first switch connected at one end to a supply voltage and connected at the other end to the first MR element and the fifth MR element;
- a second switch connected at one end to the supply voltage and connected at the other end to the first node;
- a third switch connected to the fifth node at one end and connected at the other end to a first output terminal of the bridge circuitry;
- a fourth switch connected to the fourth node at one end and connected at the other end to the first output terminal;
- a fifth switch connected to the second node at one end and connected at the other end to a second output terminal of the bridge circuitry;
- a sixth switch connected at one end to the third node and the other end to the second output terminal;
- a seventh switch connected at one end to ground and connected at the other end to the fourth MR element and the eight MR element;
- and
- an eighth switch connected at one end to ground and connected at the other end to the sixth node.
14 more elements
A magnetic-field sensor comprising bridge circuitry, the bridge circuitry comprising:
- a first magnetoresistance (MR) element;
- a second MR element connected in series with the first MR element at a first node;
- a third MR element connected in series with the second MR element at a second node;
- a fourth MR element connected in series with the third MR element at a third node;
- a fifth MR element;
- a sixth MR element connected in series with the fifth MR element at a fourth node;
- a seventh MR element connected in series with the sixth MR element at a fifth node;
- an eighth MR element connected in series with the seventh MR element at a sixth node;
- a first switch connected at one end to a supply voltage and connected at the other end to the first MR element and the fifth MR element;
- a second switch connected at one end to the supply voltage and connected at the other end to the first node;
- a third switch connected to the fifth node at one end and connected at the other end to a first output terminal of the bridge circuitry;
- a fourth switch connected to the fourth node at one end and connected at the other end to the first output terminal;
- a fifth switch connected to the second node at one end and connected at the other end to a second output terminal of the bridge circuitry;
- a sixth switch connected at one end to the third node and the other end to the second output terminal;
- a seventh switch connected at one end to ground and connected at the other end to the fourth MR element and the eight MR element;
- and
- an eighth switch connected at one end to ground and connected at the other end to the sixth node.
14 more elements
Bridge circuitry comprises:
- a first magnetoresistance (MR) element connected in series with a second MR element at a first node;
- a third MR element connected in series with the first MR element at a second node;
- a fourth MR element connected in series with the third MR element at a third node;
- a fifth MR element connected in series with a sixth MR element at a fourth node;
- a seventh MR element connected in series with the fifth MR element at a fifth node;
- and
- an eighth MR element connected in series with the seventh MR element at a sixth node;
- and
- a plurality of eight switches,
- wherein six of the plurality of eight switches are each connected to a corresponding one node.
7 more elements
Dependencies are inferred from the claim text.