| 直接数字频率合成器镜像频率的应用 |
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| 引用本文： | 陈瑞龙,于航. 直接数字频率合成器镜像频率的应用[J]. 应用科技, 2011, 0(10): 60-63 |
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| 作者姓名： | 陈瑞龙 于航 |
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| 作者单位： | 哈尔滨工程大学信息与通信工程学院 |
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| 摘 要： | 直接数字频率合成器作为一种全数字器件,应用起来十分方便,但其输出的频率上限较低,使它在应用上受到了一定的限制.对直接数字频率合成器进行研究分析基础上,扩展其频率输出上限,具有十分重要的意义.介绍了直接数字频率合成器的基本原理,分析了理想情况下它的输出频谱,提出一种利用直接数字频率合成器镜像频率来提高输出频率上限的方法,并通过理论分析及仿真实验来给予验证.实验结果证明,通过加入带通滤波器和放大器可以提取出稳定的镜像频率进而利用.
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| 关 键 词： | 直接数字频率合成器 镜像频率 频率上限 |
Application of image frequency of direct digital synthesizer |
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| CHEN Ruilong,YU Hang. Application of image frequency of direct digital synthesizer[J]. Applied Science and Technology, 2011, 0(10): 60-63 |
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| Authors: | CHEN Ruilong YU Hang |
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| Affiliation: | (College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China) |
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| Abstract: | As a digital device,the application of direct digital synthesizer（DDS） is very convenient.However,the upper frequency of DDS output is lower,which restricts the application of DDS.To research and analyze DDS and expand the upper limit of its output is of great significance.This paper introduces basic principles of DDS,analyzes the spectrum characteristic of ideal DDFS output,and then proposes a method for increasing the upper limit of output frequency by using image frequency of DDS.Theoretical analysis and simulation results verify that stable image frequency can be extracted and then used by adding band-pass filter and amplifier. |
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| Keywords: | direct digital synthesizer D image frequency upper frequency limit |
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