A Modulation Method for Tunnel Magnetoresistance Current Sensors Noise Suppression
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Published:2024-03-01
Issue:3
Volume:15
Page:360
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ISSN:2072-666X
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Container-title:Micromachines
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language:en
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Short-container-title:Micromachines
Author:
Wang Shuaipeng1, Huang Haichao1, Yang Ying2, Chen Yanning1, Fu Zhen1, Jin Zhenhu2, Shi Zhenyu2, Xiong Xingyin2, Zou Xudong2ORCID, Chen Jiamin2ORCID
Affiliation:
1. Beijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 102299, China 2. State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
Abstract
To mitigate the impact of low-frequency noise from the tunnel magnetoresistance (TMR) current sensor and ambient stray magnetic fields on weak current detection accuracy, we propose a high-resolution modulation-demodulation test method. This method modulates and demodulates the measurement signal, shifting low-frequency noise to the high-frequency band for effective filtering, thereby isolating the target signal from the noise. In this study, we developed a Simulink model for the TMR current sensor modulation-demodulation test method. Practical time-domain and frequency-domain tests of the developed high-resolution modulation-demodulation method revealed that the TMR current sensor exhibits a nonlinearity as low as 0.045%, an enhanced signal-to-noise ratio (SNR) of 77 dB, and a heightened resolution of 100 nA. The findings indicate that this modulation-demodulation test method effectively reduces the impact of low-frequency noise on TMR current sensors and can be extended to other types of resistive devices.
Funder
State Grid Corporation of China
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