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首先介绍了直接数字频率合成(DDS)技术的基本结构和理想情况下DDS的输出信号频谱特性,然后分析了实际应用中DDS杂散信号的主要来源,总结出杂散分布规律,尤其对相位截断时杂散信号的频谱特性进行详细的研究,并利用MATLAB进行仿真验证,给出了仿真结果,最后对一种新的数据压缩方法进行了分析和研究,从而改善了杂散频谱质量。
Firstly, the basic structure of direct digital frequency synthesis (DDS) technology and the spectral characteristics of DDS output signal under ideal conditions are introduced. Then the main sources of DDS spurious signals in practical applications are analyzed, and the distribution rules of spurs are summarized. Especially, the phase truncation Time spurious signal spectrum characteristics of a detailed study and the use of MATLAB simulation to verify the simulation results are given, and finally a new method of data compression analysis and research, thereby improving the quality of spurious spectrum.