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Magnetic sensor circuit

A magnetic sensor and circuit technology, applied in the direction of instruments, measuring magnetic variables, measuring devices, etc.

Inactive Publication Date: 2013-04-24
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] But in the traditional magnetic sensor circuit, the Hall element itself has a harmful offset (offset), and there is also a harmful offset to the circuit in the subsequent stage. bias, it is extremely difficult to ensure high reliability and the same quality as a magnetic sensor circuit

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0026] figure 1 is a circuit diagram showing a magnetic sensor circuit according to an embodiment of the present invention.

[0027] The magnetic sensor circuit of this embodiment includes a Hall element 1, a switch circuit 2, an amplifier 31, a switch circuit 7, a comparator 4, a switch circuit 41, voltage sources 42 and 43, a switch circuit 44, a voltage source 45, and a sample and hold circuit. 9.

[0028] In the Hall element 1, the terminals A and A' and the terminals B and B' are formed in geometrically equivalent shapes. The Hall voltage generated between the terminals (B'-B) when the voltage Vdd is applied between the terminals (A-A') of this Hall element 1 and the Hall voltage generated between the terminals (BB') when the voltage Vdd is applied between the terminals (BB') In the Hall voltage generated between (A-A'), the effective signal component (hereinafter, Voh) corresponding to the magnetic field strength is in-phase, and the bias voltage of the Hall element i...

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PUM

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Abstract

A magnetic sensor circuit is provided in which an offset of the magnetic sensor circuit can be eliminated to detect a weak magnetic field with high precision. A reference voltage source is provided to charge an input capacitor of a comparator included in the magnetic sensor circuit to a predetermined voltage.

Description

technical field [0001] The present invention relates to a magnetic sensor circuit for detecting weak magnetism. Background technique [0002] As portable communication devices and the like are miniaturized, more and more devices have a folding mechanism. As a method of detecting the state of the folding mechanism, a magnet and a magnetic sensor circuit are used. The magnetic sensor circuit shown in Patent Document 1 as an embodiment of the invention uses a magnetoresistive element as an element for magnetic detection. However, when an element for magnetic detection and a signal processing circuit are integrally formed on a semiconductor IC using a silicon substrate, as described in the background art of Patent Document 1, Hall (Hall ) element as an element for magnetic detection. Figure 6 It is an example of a magnetic sensor circuit using a Hall element. [0003] Figure 6 The magnetic sensor circuit is composed of Hall element 11, voltage source 12, amplifier 3, compara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/07
CPCG01R33/07G01R33/0023
Inventor 杉浦正一
Owner SII SEMICONDUCTOR CORP