PM-AM相关测量与分析

D. Howe, A. Hati, C. Nelson, D. Lirette
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引用次数: 7

摘要

我们通过测量交叉功率谱密度(CPSD)的实时相关性来测量和分析振荡信号中相位噪声调制(PM)和幅噪调制(AM)非线性混合的影响。我们概述了通过时间平均CPSD测量技术对PM-AM相关系数的敏感测量。使用双通道相互关联频谱分析仪进行分离但同时进行的PM和AM测量,与传统的3IM测量和散点图相关技术相比,具有出色的灵敏度,可以量化互调混频的相关影响。时间平均交叉频谱测量提供了作为傅里叶频率(f)函数的相关系数的良好估计。我们以645 MHz石英mems振荡器的归一化PM-AM CPSD测量为例,发现1/f PM-AM CPSD是完全相关的,即使PM和AM噪声水平差异很大,PM和AM的单个psd相差> 40 dB(或大于10,000因子)。我们还验证了白pm噪声具有不相关的PM-AM CPSD。
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PM-AM correlation measurements and analysis
We measure and analyze effects of nonlinear mixing of phase-noise modulation (PM) and amplitude-noise modulation (AM) in an oscillating signal by real-time correlations measured in the cross power spectral density (CPSD). We outline sensitive measurements of PM-AM correlation coefficients by means of a time-averaged CPSD measurement technique. Separate but simultaneous PM and AM measurements using a two-channel cross-correlation spectrum analyzer, quantifies the relevant effects of intermodulation mixing with excellent sensitivity compared to traditional 3IM measurements and the scatter-plot correlation technique. Time-averaged cross-spectrum measurements provide good estimates of correlation coefficients as a function of Fourier frequency (f). We use normalized PM-AM CPSD measurements of a 645 MHz quartz-MEMs oscillator as an example and find that 1/f PM-AM CPSD is exactly correlated, even for very widely differing levels of PM and AM noise, in which individual PSDs of PM and AM differ by >;40 dB (or, greater than a factor of 10,000). We also verify that white-PM noise has uncorrelated PM-AM CPSD.
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