Direct Digital Synthesizer (DDS) and Performance Analysis
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摘要: 介绍了直接数字频率合成器DDS(Direct Digital Synthesizer)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.Abstract: 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.
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Key words:
- frequency synthesizers /
- frequency spectrum /
- resolving power /
- phase noise
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1. 许慧波,张厥盛. DDS——直接数字式频率合成器综述. 西安:西安电子科技大学出版社,1989 2. 王建新,张先萌. 直接数字频率合成中相位截断误差分析. 电子测量与仪器学报,1995,9(1):1~6 3. Jierney J, Radar C M, Gold B. A digital frequency synthesizer. IEEE Trans Audio Eltroacoust, 1971,Au-19:48~57 4. Reinhardt V, Gould K, McNab K, et al. A short survey of frequency synthesizer techniques. Hughes Aircraft Company Space and Communications Group, 40th Annual Freuquency Control Symposium, 1986.355~363 5. 田 良.直接数字合成器专用集成电路的性能及应用.国外电子测量技术,1996(5):14~17 -
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