| DDS中实现相位至幅度映射的一种新方法 |
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| 引用本文： | 张玉良,吴伟陵,田宝玉.DDS中实现相位至幅度映射的一种新方法[J].北京邮电大学学报,2003,26(2):95-99. |
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| 作者姓名： | 张玉良 吴伟陵 田宝玉 |
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| 作者单位： | 北京邮电大学 信息工程学院 , 北京 100876 |
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| 摘 要： | 提出了直接数字频率合成器 ( DDS)中相位至幅度映射的一种新方法 . 通过联合运用抛物线 近似和线性近似实现了对正弦信号的高精度近似 ,所产生的最大谐波电平为 - 56. 7 dB的正弦信 号 ,可直接应用于许多场合. 辅以少量 ROM则可以进一步提高输出正弦信号的精度.
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| 关 键 词： | 直接数字频率合成器 ( DDS) 抛物线近似 软件无线电 |
| 文章编号： | 1007-5321(2003)02-0095-05 |
| 修稿时间： | 2002年4月15日 |
A New Technique of Mapping from Phase to Amplitude in Direct Digital Frequency Synthesizer |
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| ZHANG Yu-liang,WU Wei-ling,TIAN Bao-yu.A New Technique of Mapping from Phase to Amplitude in Direct Digital Frequency Synthesizer[J].Journal of Beijing University of Posts and Telecommunications,2003,26(2):95-99. |
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| Authors: | ZHANG Yu-liang WU Wei-ling TIAN Bao-yu |
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| Affiliation: | Information Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| Abstract: | A new technique of mapping from phase to sine amplitudes in direct digital frequency synthesizer ( DDS) is presented in this paper. Through using parabolic approximation and linear approximation together, sine function signal is approximated with highly accuracy. The generated sine function signal with the maximum harmonic level of 56. 7 dB can be used directly in many situations. With the aid of few ROM the accuracy of the generated sine function signal can be improved even more. |
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| Keywords: | direct digital frequency synthesizer (DDS) parabolic approximation software radio |
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