直接数字频率合成器频谱分析  

Spectrum Analysis of DDS

作　　者：谌璄 王福昌[1] 朱光喜[1] 

机构地区：[1]华中科技大学电子与信息工程系

出　　处：《华中科技大学学报（自然科学版）》2003年第2期84-86,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：通过严格的数学推导 ,得到DDS输出信号的时域表达式和频谱表达式 .不论DDS系统是否有相位截断 ,这些表达式均成立 。Among the three kinds of frequency synthesizers,direct digital synthesizers are regarded highly because of the outstanding properties. But the spurious specturm caused by phase truncation affects the quality of output signal greatly. Based on the mathematical deduction, the time domain expression and the spectrum expression of direct digital synthesizer′s output signal were proposed. These expressions exist whether there is phase truncation or not. They make it convenient to calculate the spurious spectrum accurately.

关 键 词：直接数字频率合成器 相位截断 杂散抑制度 DDS系统 频率分辨率 频谱分析 

分 类 号：TN741[电子电信—电路与系统]