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Magnetic sensor circuit

A magnetic sensor and circuit technology, applied in instruments, measuring magnetic variables, magnetic measurement environment, etc., can solve problems such as miniaturization of difficult magnetic sensor circuits

Inactive Publication Date: 2018-11-13
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, it is difficult to miniaturize the magnetic sensor circuit

Method used

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Experimental program
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no. 1 approach

[0037] refer to figure 1 Next, the magnetic sensor circuit configuration of the first embodiment will be described.

[0038] figure 1 It is a circuit diagram of the magnetic sensor circuit 100 of 1st Embodiment.

[0039] The magnetic sensor circuit 100 of the first embodiment includes a power supply terminal TM1, a ground terminal TM2, resistors R1, R2, a first switch circuit SW1, a second switch circuit SW2, a third switch circuit SW3, and a Hall element H1. The Hall element H1 is an example of a magnetoelectric conversion element.

[0040] The first switch circuit SW1 includes a first switch SW11 , a first switch SW12 , a first switch SW13 , and a first switch SW14 . The first switch circuit SW1 is an example of a switch circuit.

[0041] The second switch circuit SW2 includes a second switch SW21 and a second switch SW22. The second switch circuit SW2 is an example of a switch circuit.

[0042] The third switch circuit SW3 includes a third switch SW31 and a third swit...

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PUM

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Abstract

The invention relates to a magnetic sensor circuit. The magnetic sensor circuit includes a magnetoelectric conversion element having a plurality of terminals including at least a voltage supply terminal to which a drive voltage is applied, and a ground terminal, a switch circuit configured to output signals provided from any two of the terminals as a differential voltage, and a first resistor having a first temperature characteristic being a prescribed temperature characteristic. A current supplied from the voltage supply terminal flows to the ground terminal through the first resistor and themagnetoelectric conversion element.

Description

technical field [0001] The present invention relates to magnetic sensor circuits. Background technique [0002] A magnetic sensor circuit using a magnetoelectric conversion element (for example, a Hall element) is used in various electronic devices as a non-contact sensor. For example, this magnetic sensor circuit is used in a foldable mobile phone. The magnetic sensor circuit detects the opening and closing of the cellular phone when the magnetic field exceeds a certain fixed threshold. The magnetic sensor circuit includes a Hall element and a signal processing circuit that processes a signal output from the Hall element. However, an offset voltage may be generated in a Hall element or a signal processing circuit. When the offset voltage is generated, there is a case where the strength of the detected magnetic field is erroneous. When the intensity of the detected magnetic field is misunderstood, the position of the magnet or the like that generates the magnetic field i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/07
CPCG01R33/0035G01R33/07G01R33/075G01R33/0023G01R33/0082G01R33/077
Inventor 入口雅夫
Owner SII SEMICONDUCTOR CORP