脉冲溢出型DDS输出信号频谱分析  

SPECTRUM ANALYSIS FOR THE PULSE OUTPUT DDS

作　　者：姜萍[1] 王建新[1] 蒋立平[1] 谭雪琴[1] 

机构地区：[1]南京理工大学电光学院,江苏南京210094

出　　处：《陕西科技大学学报（自然科学版）》2008年第5期92-94,共3页Journal of Shaanxi University of Science & Technology

摘　　要：脉冲溢出型DDS利用相位累加器的溢出信号作为输出信号,很容易用FPGA器件实现,但它输出的脉冲信号存在相位抖动的缺点.作者根据脉冲溢出型DDS的工作原理对其输出脉冲信号的抖动进行了理论分析,得到了输出脉冲信号的频谱表达式,并给出了计算机仿真结果.The pulse overflow DDS, in which the overflow signal of the phase accumulator is used for the pulse output, can be easily implemented by using FPGA. But its pulse output has the drawback of the phase jitter. This paper analyzes the phase jitter of the overflow signal, and the spectrum expression of the pulse output is obtained. The computer simulation results are also given.

关 键 词：直接数字频率合成 波形产生 频谱分析 相位抖动 相位累加器 

分 类 号：TN74[电子电信—电路与系统]