噪音(视频)
噪声发生器
噪声测量
噪声地板
电子工程
计量系统
噪声温度
声学
闪烁噪声
约翰逊-奈奎斯特噪音
校准
电气工程
快速傅里叶变换
电阻器
Y系数
准确度和精密度
工程类
电压
噪声系数
计算机科学
相位噪声
降噪
物理
CMOS芯片
放大器
算法
量子力学
天文
人工智能
图像(数学)
作者
Aiyu Dou,Ru Bai,Huachen Zhu,Zhenghong Qian
出处
期刊:Sensor Review
[Emerald Publishing Limited]
日期:2023-04-25
卷期号:43 (3): 200-207
被引量:2
标识
DOI:10.1108/sr-07-2022-0284
摘要
Purpose The noise measurement on magnetoresistive (MR) sensors is generally conducted by techniques including single-channel data sampling and fast Fourier transform (FFT) analysis as well as two-channel cross-correlation. The single-channel method is easy to implement and is widely used in the noise measurement on MR sensors, whereas the two-channel method can only eliminate part of the system noise. This study aims to address two key issues affecting measurement accuracy: calibration of the measurement system and the elimination of system noise. Design/methodology/approach The system is calibrated by using a low-noise metal film resistor in that the system noise is eliminated through power spectrum subtraction. Noise measurement and analysis are conducted for both thermal noise and detectivity of magnetic tunnel junction (MTJ) sensor. Findings The thermal noise measurement error is less than 2%. The detectivity of the MTJ sensor reaches 27 pT/Hz 1/2 at 2 kHz. Originality/value This study provides a more practical solution for noise measurement and system calibration on MR sensors with a bias voltage and magnetic field.
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