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对DDS的幅度量化杂散信号进行了时域分析和频谱仿真 ,得到一些关于其频谱特征和杂散水平的规律性结论。然后给出一种在工程实际中用于降低DDS输出杂散的级联方案 ,并以前面分析所得到的结论为依据 ,对方案进行了初步研究。
The time-domain analysis and spectrum simulation of amplitude-quantized spurs of DDS are carried out, and some regular conclusions about their spectral characteristics and spurious levels are obtained. Then a cascade scheme to reduce the spurious output of DDS in engineering practice is given. Based on the conclusions drawn in the previous analysis, a preliminary study of the scheme is made.