Magneto-resistance sensor with self-checking coil
A magnetoresistance sensor and magnetoresistance technology, applied in instruments, measuring devices, measuring magnetic variables, etc., can solve the problems of large winding resistance, large chip area, long winding path, etc. The effect of occupying small chip area and short routing path
Pending Publication Date: 2018-07-24
MEMSIC SEMICON WUXI
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Problems solved by technology
The self-test magnetic field is generated by passing current into the self-test coil. Traditionally, the self-test coil of the ring winding method has the disadvantages of long winding path, large winding resistance, and large chip area occupied by the winding.
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[0020] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and connected in this article that indicate electrical connection all indicate direct or indirect electrical connection, and indirect electrical connection refers to electrical connection via another device or circuit.
[0022] Please refer to figure 1 Shown, it is t...
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The invention provides a magneto-resistance sensor. The sensor comprises multiple longitudinally long-strip-shaped slopes, magnetic field sensing units and a self-checking coil; the slopes are arranged on a substrate in parallel successively, and each slope comprises a bottom surface and first and second inclination surfaces distributed at the two sides of the longitudinal extension direction of the bottom surface respectively; each magnetic field sensing unit comprises a magneto-resistance strip extending along the magnetic easy axis, the first and second inclination surfaces of each slope form the magnetic field sensing units respectively, and the direction of the magnetic easy axis of each magnetic field sensing unit is consistent with the longitudinal extension direction of the corresponding slope; and the self-checking coil is positioned under or over the bottom surfaces of the multiple longitudinally long-strip-shaped slopes, and comprises leads which are arranged in parallel successively, the extension direction of the lead is consistent with the longitudinal extension direction of the slope, and the leads are connected in series successively to form the self-checking coil in a snakelike coiling manner. Compared with the prior art, the self-checking coil arranged in the sensor is short in coiling path and low in coiling resistance and occupies small chip area during coiling.
Description
【Technical field】 [0001] The invention relates to the technical field of magnetoresistance sensors, in particular to a self-inspection coil of a magnetoresistance sensor in a serpentine winding manner. 【Background technique】 [0002] For magnetoresistive sensors, the sensitivity will change due to aging; when the magnetic field exceeds a certain range, a zero signal is output. Therefore, a self-test magnetic field needs to be generated inside the magnetoresistive sensor to calibrate the sensitivity or judge whether it is saturated. The self-test magnetic field is generated by passing current into the self-test coil. Traditionally, the self-test coil in the form of toroidal winding has the disadvantages of long winding path, large winding resistance, and large chip area occupied by the winding. [0003] Therefore, it is necessary to propose a solution to solve the above problems. 【Content of invention】 [0004] The object of the present invention is to provide a magneto-re...
Claims
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IPC IPC(8): G01R33/09
CPCG01R33/09G01R33/093G01R33/096G01R33/098
Inventor 李大来蒋乐跃刘海东
Owner MEMSIC SEMICON WUXI