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Hall sensors and sensing methods

A technology of Hall sensor and sensor device, applied in the field of sensors, can solve problems such as offset error

Active Publication Date: 2014-02-12
INFINEON TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Magnetic field sensors, such as Hall sensors, are sensitive to magnetic fields, but may suffer from offset errors

Method used

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  • Hall sensors and sensing methods
  • Hall sensors and sensing methods
  • Hall sensors and sensing methods

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Embodiment Construction

[0054]Embodiments relate to multi-touch sensor devices and methods of operation that reduce or eliminate offset errors. In an embodiment, a sensor device may comprise three or more contacts, and a plurality of such sensor devices may be combined. The sensor device may comprise a Hall sensor device, such as a vertical Hall device, or in embodiments other sensor types. The mode of operation can be implemented for a multi-contact sensor device that provides important modifications and improvements over conventional spin current principles including reduced residual offset. As mentioned earlier, offset errors can be related to different causes, two of which are raw offset errors and residual offset errors. Raw offset error may refer to the offset error present in a particular stage of operation, while residual offset error may refer to the offset error present in the aggregate or the entire output signal, for example as those from individual stages of operation Combined signals....

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Abstract

Embodiments relate to multi-contact sensor devices and operating methods thereof that can reduce or eliminate offset error. In embodiments, sensor devices can comprise three or more contacts, and multiple sensor devices can be combined. The sensor devices can comprise Hall sensor devices, such as vertical Hall devices, or other sensor types. Operating modes can be implemented for the multi-contact sensor devices which offer significant modifications of and improvements over conventional spinning current principles. In a first operating mode, the sensor is supplied with the same input current in all operating phases, with the output voltages of all operating cycles sensed and processed. In another operating mode, the sensor device is supplied with the same input voltage in all operating phases, the sense terminals are forced to constant potentials, and the currents flowing into or out of the sense terminals are sensed and processed.

Description

technical field [0001] The present invention relates generally to sensors and more particularly to offset cancellation in Hall sensor devices. Background technique [0002] Magnetic field sensors, such as Hall sensors, are sensitive to magnetic fields, but may suffer from offset errors. Offset error is the presence of an output signal in the absence of some input quantity. In the example associated with a Hall sensor, the offset error will be the output signal representing the input magnetic field when there is actually no magnetic field present. [0003] Offset errors can be associated with different causes, two of which are raw offset errors and residual offset errors. Raw offset error may refer to offset error present in a particular phase of operation. Residual offset error may refer to an offset error present in the total or in the entire output signal, eg a signal that is a combination of those from individual stages of operation. [0004] One method for reducing o...

Claims

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Application Information

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IPC IPC(8): G01R33/07G01D5/16
CPCG01R33/07G01R33/075G01R19/25
Inventor U.奥塞勒奇纳
Owner INFINEON TECH AG
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