| 摘要: |
| 首先对２种不同类型的幅度量化杂散信号进行了描述和时域分析，然后用离散傅里叶变换法着重对无相位舍位民政部下的幅度量化杂散信号进行了频谱仿真。得到了一些关于其频谱特征和杂散水平的规律性结论，这些结论对ＤＤＳ的工程应用有重要的指导作用。 |
| 关键词: 直接数字频率合成 背景噪声 时域分析 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目: |
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| An Analysis of the Background Noise of Direct Digital Synthesizers |
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| Abstract: |
| In this paper, two different kinds of spurious signals generated by the amplitude truncation are formulated and their waveform characters are briefly analyzed. Then, the frequency spectra of the amplitude-truncation spurious signals without the presence of phase truncation are emphatically simulated with the DFT method and some important conclusions are achieved, which are instructive to the application of DDS. |
| Key words: DDS, spurious signals, background noise, DFT |
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