基于非均匀采样模型的DDS相位截断杂散谱分析
An Analysis of DDS Spurious Spectrum Based on Non-uniformly Sampled Model
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摘要: 该文提出直接数字频率合成器(DDS)的非均匀采样模型，在此模型的基础上对DDS的相位截断频谱杂散进行了分析和计算，给出了一些重要的结论并指出了影响杂散特性一种较为准确的解释。同时给出了一种抑制相位截断噪音的方法。Matlab仿真结果表明在一定条件下该方法能够有效抑制相位截断误差。Abstract: A non-uniformly sampled model to DDS is introduced, based on which an analysis of DDS phase truncation noise is deduced and some important conclusions including the explanation to this kind of spur noise are derived. Further more, a technique to restrain DDS spur noise is introduced. The Matlab simulation indicates that DDS spur noise can be effectively restrained using this technique under some restriction conditions.
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