基于小波分析和虚拟仪器技术的1/f噪声研究

传统基于傅立叶分析和频谱分析仪的微弱信号检测方法无法对1／f噪声进行实时、高速、精确的测量与分析。本文在以虚拟仪器为平台。内嵌小波分析的低频噪声检测系统基础上对1／f噪声进行了实验和理论研究。实验结果表明，该系统能够检测到的1／f噪声幅值比传统的测试方法低2个数量，以小波理论构建的两个参量更深入细微地表征了1／f噪声特性：模极大值分布能够鉴别不同类型的1／f噪声产生机构，相似系数可描述应力对器件1／f噪声的影响。

Study of 1/f Noise by Means of Wavelet Analysis and Virtual Instrument Technology

As a traditional method, the system based on Fourier analysis and frequency spectrum analyzer can not be used to test 1/f noise timely, fast and accurately.A testing and analyzing system based on wavelet analysis and virtual instrument is set up, by which 1/f noise is studied in theory and experiment. Experimental results demonstrate that this system can be used to test 1/f noise which is lower two scale than what can be tested by a traditional system. Two parameters are presented based on wavelet theory and are well used to characterize 1/f noise: wavelet maxima can be used to probe differect generation mechanisms of 1/f noise and similarity coefficient to picture effects of stress on 1/f noise