摘要
介绍了直接数字频率合成器ＤＤＳ（ＤｉｒｅｃｔＤｉｇｉｔａｌＳｙｎｔｈｅｓｉｚｅｒ）的组成、工作原理及性能；运用信号系统理论和方法详细分析了ＤＤＳ的相位噪声、杂散噪声、数字化截断误差对输出波形的影响以及ＤＡＣ非线性对频谱纯度的影响等；还给出了相应的分析计算公式和响应曲线；得出的结论对提高ＤＤＳ输出信号的质量有一定意义．
This paper introduces the composition, operational principle and performance of DDS, and uses signal theory and method to analyze the effect of phase noise, spurious noise and digital phase truncation error on output wave form and the effect of DAC non linearity on spectrum purity in detail. Analysis formula and correspondence curve in question are also provided. The conclusion is some instructive to increase the quality of DDS output signal.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
1998年第5期615-618,共4页
Journal of Beijing University of Aeronautics and Astronautics
关键词
频率合成器
频谱
分辨率
相位噪声
数字式
frequency synthesizers
frequency spectrum
resolving power
phase noise
