DDS相位截断杂散谱精确分析方法的改进  

Improved Method of the Precise Analysis of Spurious Sprectrum of DDS in Presence of Phase Trunction

作　　者：袁福[1] 郑林华[1] 袁继兵[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《现代电子技术》2008年第21期181-183,共3页Modern Electronics Technique

摘　　要：直接数字频率合成器(DDS)相位截断误差序列是DDS输出信号误差的主要来源,很有必要对DDS相位截断误差序列的谱进行研究。文献[1]提出了DDS相位截断杂散谱的精确分析方法,该文对DDS的相位截断杂散谱精确分析方法进行改进,提出一种新的精确分析方法,通过这种方法可以方便地确定不同频率控制字的杂散谱分布。此外新方法对改进算法与原算法的性能进行了分析,通过比较,改进算法的计算量明显比原算法的计算量要小,易于仿真。Phase trunction is the biggest error of signal generated by DDS and its spurious spreetrum is necessary to be studied. A method which precisely analysed the spurious sprectrum of DDS in presence of phase trunction has been presented. The method is improved by this paper, and a new method is presented which can easily analyse the spurious sprectrum of different tuning words. The performance of the new method is simply analyzed. Comparing with the algorithm presented before, it is much easier to simulated.

关 键 词：直接数字频率合成 相位截断 杂散 精确分析 

分 类 号：TN74[电子电信—电路与系统]