基于非均勻采樣模型的DDS相位截斷雜散譜分析
An Analysis of DDS Spurious Spectrum Based on Non-uniformly Sampled Model
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摘要: 該文提出直接數(shù)字頻率合成器(DDS)的非均勻采樣模型，在此模型的基礎上對DDS的相位截斷頻譜雜散進行了分析和計算，給出了一些重要的結論并指出了影響雜散特性一種較為準確的解釋。同時給出了一種抑制相位截斷噪音的方法。Matlab仿真結果表明在一定條件下該方法能夠有效抑制相位截斷誤差。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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