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一种用于隧道磁电阻电流传感器噪声抑制的调制方法。

A Modulation Method for Tunnel Magnetoresistance Current Sensors Noise Suppression.

作者信息

Wang Shuaipeng, Huang Haichao, Yang Ying, Chen Yanning, Fu Zhen, Jin Zhenhu, Shi Zhenyu, Xiong Xingyin, Zou Xudong, Chen Jiamin

机构信息

Beijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 102299, China.

State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

出版信息

Micromachines (Basel). 2024 Mar 1;15(3):360. doi: 10.3390/mi15030360.

DOI:10.3390/mi15030360
PMID:38542607
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10971799/
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.

摘要

为减轻隧道磁阻（TMR）电流传感器的低频噪声和环境杂散磁场对弱电流检测精度的影响，我们提出了一种高分辨率调制解调测试方法。该方法对测量信号进行调制和解调，将低频噪声转移到高频频段以进行有效滤波，从而将目标信号与噪声分离。在本研究中，我们为TMR电流传感器调制解调测试方法开发了一个Simulink模型。对所开发的高分辨率调制解调方法进行的实际时域和频域测试表明，TMR电流传感器具有低至0.045%的非线性、77 dB的增强信噪比（SNR）以及100 nA的提高分辨率。研究结果表明，这种调制解调测试方法有效地降低了低频噪声对TMR电流传感器的影响，并且可以扩展到其他类型的电阻式器件。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6d52/10971799/c38a8d73d3d0/micromachines-15-00360-g015.jpg
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