| 引用本文: | 李琳,邹涛,王松,等.一种抑制相位截断误差引起的杂散分量的方法.[J].国防科技大学学报,1999,21(6):63-67.[点击复制] |
| Li lin,Zhou tao,Wang song,et al.A Technique of Suppressing Spurs Caused by Phase Truncation Error[J].Journal of National University of Defense Technology,1999,21(6):63-67[点击复制] |
|
| |
|
|
| 本文已被：浏览 6239次 下载 6081次 |
| 一种抑制相位截断误差引起的杂散分量的方法 |
| 李琳, 邹涛, 王松, 张尔扬 |
|
(国防科技大学 电子工程学院 湖南 长沙 410073)
|
| 摘要: |
| 文中介绍了一种抑制直接数字频率合成(DDS) 时由相位截断误差引起的杂散分量的方法——相位抖动法。这种方法通过给相位累加器加入抖动, 来打乱相位截断误差序列的周期性, 将其变为随机序列, 这样就把原来由于误差序列周期性引起的有规律的杂散分量变为幅度较低的随机相位噪声, 从而降低了输出的杂散信号电平与有用信号的电平之比, 达到改善输出频谱特性的目的。本文对该方法做了深入的分析, 给出了分析结果, 最后用仿真手段验证理论分析结果。 |
| 关键词: 直接数字频率合成, 相位截断, 抖动 |
| DOI： |
| 投稿日期：1998-04-29 |
| 基金项目: |
|
| A Technique of Suppressing Spurs Caused by Phase Truncation Error |
| Li lin, Zhou tao, Wang song, Zhang eryang |
|
(Institute of Electronic Engineering, NUDT, Changsha, 410073)
|
| Abstract: |
| This paper presents a dither technique for suppressing spurs in DDS. This technique converts the phase truncation error sequence into a random sequence by adding dither to the phase accumlator, destroys the period of phase truncation error sequence, and turns the discrete line spurs into random noise, which obtains the improvement of the DDS output spectrum at last. The technique is analysed, the results of this analysis is presented and confirmed by simulation. |
| Keywords: DDS, phase truncation, dithering |
|
|
|
|
|
