Magnetoresistive sensor system

Abstract

The invention discloses a magnetoresistive sensor system, which belongs to the technical field of magnetoresistive sensors and comprises a first AMR magnetoresistive sensor arranged on a first panel coil and including a first signal output terminal, a second AMR magnetoresistive sensor arranged on a second panel coil and including a second signal output terminal, a differential amplifier which comprises a first input end, a second input end, a feedback end and a voltage output end, wherein the first signal output end is connected with the first input end, and the second signal output end is connected with the second input end; a feedback circuit is further arranged between the voltage output ends and outputs a feedback signal to the feedback end. The system has the advantages that the dataoutput rate is increased, and the sensitivity of magnetic field measurement is improved.

Description

technical field [0001] The invention relates to the technical field of magnetoresistance sensors, in particular to a double out-of-phase magnetoresistance sensor system. Background technique [0002] The basic structure of the AMR magnetoresistive sensor is composed of a Wheatstone bridge composed of four magnetoresistances. The external magnetic field value can be obtained by outputting a differential voltage signal at the two output terminals of the test bridge. AMR magnetoresistive sensors are very suitable for sensing geomagnetism and the range of sensing magnetic field is tens of gauss. This kind of sensor can be used to detect some ferromagnetic objects such as airplanes, trains, and automobiles. It is also used in magnetic compass, rotary position sensing, Current sensing, drilling orientation, line position measurement, yaw rate sensor and head trajectory tracking in virtual reality, etc. [0003] like figure 1 As shown, the existing magnetoresistive sensor system ...

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Problems solved by technology

[0003] like figure 1 As shown, the existing magnetoresistive sensor system is usually a single-bridge resistive magnetoresistive sensor system, and this kind of magnetoresistive sensor system needs two stages (SET stage and RESET stage) to measure the magnetic field. To complete a magnetic field value measurement, in the two stages, the plate coils under the AMR magnetoresistive sensor are applied with mutually opposite currents, and then the magnetization directions of the magnetoresistive sensors are also reversed, and the voltage values ​​output by the two stages are recorded. Then subtract and divide by two to eliminate the offset error, and finally get the voltage signal used to characterize the magnetic field value; however, this kind of magnetoresistive sensor system needs to spend two cycles in two stages during a magnetic field value measurement process , resulting in a low data output rate

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