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Magnetic field sensing apparatus and sensing method thereof

一种磁场感测、磁场的技术，应用在磁场感测装置及感测领域，能够解决增加生产成本、大设计布局面积等问题，达到电路面积减小、降低电路成本、降低环境干扰的效果

Active Publication Date: 2018-08-31
ISENTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an AMR sensor with a Wheatstone bridge structure, four AMRs are required, which will increase the production cost and require a larger design layout area

Method used

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  • Magnetic field sensing apparatus and sensing method thereof
  • Magnetic field sensing apparatus and sensing method thereof
  • Magnetic field sensing apparatus and sensing method thereof

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Embodiment Construction

[0036] Please refer to figure 1 , figure 1 is a schematic diagram showing a magnetic field sensing device according to an embodiment of the present invention. The magnetic field sensing device 100 includes an anisotropic magnetoresistor 110 , a current generator 120 and a computing unit 130 . The anisotropic magneto-resistor 110 provides a first resistance value and a second resistance value according to the measured magnetic field He through a magnetization direction setting operation. The current generator 120 is coupled to the anisotropic magnetoresistor 110 and provides a current I to flow through both ends of the anisotropic magnetoresistor 110 according to the current direction D. The arithmetic unit 130 has an input terminal of the arithmetic unit coupled to the two ends of the anisotropic magnetic resistance 110, and the first resistance value and the second resistance value provided by the anisotropic magnetic resistance are respectively generated according to the f...

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Abstract

A magnetic field sensing apparatus and a sensing method are provided. The magnetic field sensing apparatus includes an anisotropic magnetoresistive (AMR) resistor, a current generator, and an arithmetic device. The AMR resistor is configured to provide a first resistance value according to a sensed magnetic field in a first magnetic field sensing phase and provide a second resistance value according to the sensed magnetic field in a second magnetic field sensing phase by a magnetized direction setting operation. The current generator provides a current based on a current direction to flow through two ends of the AMR resistor. The arithmetic device is configured to perform an arithmetic operation with respect to a first voltage difference and a second voltage difference generated accordingto the current respectively in the first magnetic field sensing phase and the second magnetic field sensing phase, and generate a magnetic field sensing voltage result accordingly.

Description

technical field [0001] The invention relates to a magnetic field sensing device and a sensing method, in particular to a magnetic field sensing device and a sensing method composed of anisotropic magnetoresistance. Background technique [0002] Magnetic field sensing devices are fundamental to provide compass and motion tracking systems. For portable systems such as smartphones, tablets or smart watches, and commercial or industrial systems such as drones, magnetic field sensing devices must be very accurate, small package size, and very power efficient at high output data rates. These requirements have made magneto-resistive sensors including Anisotropic MagnetoResistive (AMR), Giant MagnetoResistive (GMR) and Tunneling MagnetoResistive (TMR) sensors mainstream. Among them, the anisotropic magnetoresistive sensor is the earliest developed magnetoresistive technology. Although the sensitivity of anisotropic magnetoresistive sensors is lower than that of giant magnetoresist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09G01R33/00
CPCG01R33/0005G01R33/096
Inventor 袁辅德高培钧赖孟煌
Owner ISENTEK INC