时钟抖动和相位噪声对数据采集的影响  

Effect of Clock Jitter and Phase Noise on Data Acquisition

作　　者：段宗明[1] 柴文乾[1] 代传堂[1] 

机构地区：[1]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《雷达科学与技术》2010年第4期372-375,共4页Radar Science and Technology

摘　　要：随着采样频率和A/D变换器位数的增加,时钟抖动和相位噪声对数据采集系统性能的影响更加显著。从相位噪声的双边带功率谱密度出发,详细分析了相位噪声和周期间抖动之间的联系,指出了相位噪声的不同频段对周期间抖动的影响,讨论了数据采集信噪比与时钟抖动和相位噪声之间的关系;并通过仿真给予定量的计算,对时钟源和数据采集系统的设计提供了一些建议;最后,利用某雷达数据采集系统进行实验,给出了相关实验结果。The effect of clock jitter and phase noise on data acquisition system performance is more profound as the increase of sampling frequency and the bit of A/D converter.The relationship between phase noise and time jitter is discussed,and the characteristics of jitter performance of phase noise at different frequency offsets is revealed;then the effect of clock jitter on the signal-to-noise ratio of A/D converter is analyzed.Additionally,the quantitative result is obtained though simulation,and suggestion is presented for the designers of clock source and data acquisition system.Finally,the experimental result is also presented.

关 键 词：时钟抖动 相位噪声 A/D变换器 信噪比 采样时钟 

分 类 号：TN957.5[电子电信—信号与信息处理]