DDS的杂散分析及降低杂散的方法  

Spurious Signals Analysis of Direct Digital Frequency Synthesizer and Spur Reduction Techniques

作　　者：刘兰坤[1] 潘明海[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《电子器件》2007年第2期572-574,578,共4页Chinese Journal of Electron Devices

摘　　要：对直接数字频率合成器(DDS)的相位截断杂散、幅度量化杂散及非线性杂散的频谱特征和分布规律进行了定性分析,得到相位截断是DDS输出频谱杂散的主要来源.利用得到的结论提出了合理选择时钟频率的方法,用于抑制DDS输出信号中的相位截断杂散,然后探讨了DDS级联设计的方法,用于降低系统设计中DDS输出信号的杂散,最后进行了计算机仿真,证实了本文方法的可行性.The spurious signals in DDS generated by phase-truncation,amplitude-truncation and the digital-to-analog conversions are analyzed,and their frequency spectra characters and distributing rules are studied.The conclusion presents phase truncation is the critical source of spurious signals spectrum in DDS.A new method selecting the clock frequency correctly is proposed.It is used to eliminate spur caused by phase truncation.Then the author presents a scheme of concatenation structure to reduce spurs of output ...

关 键 词：直接数字频率合成 降低杂散 相位截断 级联 

分 类 号：TN74[电子电信—电路与系统]