| DDS相位舍位杂散信号的频谱分析 |
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| 引用本文： | 邓潘.DDS相位舍位杂散信号的频谱分析[J].雷达科学与技术,2009,7(2):151-153. |
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| 作者姓名： | 邓潘 |
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| 作者单位： | 解放军电子工程学院,安徽合肥,230037 |
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| 摘 要： | 杂散特性限制着直接数字频率合成（DDS）技术的应用和发展,其中相位舍位、幅度量化和DAC的非理想特性等是影响DDS输出频谱质量的主要杂散源。文中主要研究相位舍位对DDS输出频谱的影响,首先通过离散傅里叶变换将任意的频率控制字转化为频率控制字为1来对DDS的输出信号进行频谱分析,然后由DDS的输出序列入手深入研究了相位舍位时DDS输出频谱的特性,得到的DDS输出频谱的数学模型精确、简单。
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| 关 键 词： | 直接数字频率合成 相位舍位 频率控制字 频谱分析 |
Spectrum Analysis of Spurious Signals in Direct Digital Frequency Synthesizer Due to Phase Truncation |
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| DENG Pan.Spectrum Analysis of Spurious Signals in Direct Digital Frequency Synthesizer Due to Phase Truncation[J].Radar Science and Technology,2009,7(2):151-153. |
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| Authors: | DENG Pan |
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| Affiliation: | Electronic Engineering Institute of PLA;Hefei 230037;China |
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| Abstract: | Spurious characteristic restricts the application and development of direct digital frequency synthesizer(DDS) technology.There are several sources of spurious signal:phase truncation,amplitude quantization,DAC's non-ideal characteristics,etc.This paper mainly analyzes the influence of phase truncation on the output spectrum of DDS.Firstly this paper converts arbitrary frequency control word(FCW) into one via discrete Fourier transform,and then analyzes the output spectrum of DDS in the presence of phase tr... |
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| Keywords: | direct digital frequency synthesizer phase truncation frequency control word（FCW） spectrum analysis |
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