| 基于DDS的低相噪频率综合源设计 |
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| 引用本文： | 谢仁宏,是湘全.基于DDS的低相噪频率综合源设计[J].现代雷达,2003,25(12):41-43. |
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| 作者姓名： | 谢仁宏 是湘全 |
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| 作者单位： | 南京理工大学电子工程与光电技术学院,南京,210094 |
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| 摘 要： | 分析了相位累加器截断、波形ROM有限字长、DAC等对直接数字频率合成器(DDS)相位噪声的影响，得出了DDS芯片本身对输出信号相位噪声影响很小的结论。给出了采用AD9854芯片构成的低相噪频率综合源的硬件组成以及系统实测的相位噪声、杂散技术指标。
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| 关 键 词： | DDS 直接数字频率合成 相位噪声 相位截断 杂散频谱 频率综合源 |
| 修稿时间： | 2002年12月30 |
Design of Low Phase Noise Frequency Synthesizer Based on DDS |
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| XIE Ren-hong SHI Xiang-quan.Design of Low Phase Noise Frequency Synthesizer Based on DDS[J].Modern Radar,2003,25(12):41-43. |
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| Authors: | XIE Ren-hong SHI Xiang-quan |
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| Abstract: | The influences on phase noise of direct digital frequency synthesizer with truncation of the phase information stored in the accumulator,truncation of sine words in look-up tables and finite bit resolution of DAC are analyzed,It is shown that the effect of DDS chip itself on the phase noise of output signal can be neglected. The hardware constitution of a low phase noise frequency synthesizer using AD9854 and the measured performances of system phase noise and spurious spectrum are presented. |
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| Keywords: | direct digital frequency synthesizer phase noise phase truncation spurious spectrum |
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