| DDS信号源的幅频特性补偿方法研究 |
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| 引用本文： | 王文梁,田书林,刘科.DDS信号源的幅频特性补偿方法研究[J].测控技术,2007,26(8):9-11. |
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| 作者姓名： | 王文梁 田书林 刘科 |
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| 作者单位： | 电子科技大学,自动化学院,四川,成都,610054;电子科技大学,自动化学院,四川,成都,610054;电子科技大学,自动化学院,四川,成都,610054 |
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| 摘 要： | 在对DDS输出信号经D/A转换后的频谱特性进行分析的基础上,提出了一种幅频特性补偿方法.该方法利用LC并联电路在谐振点能够对信号进行放大的特点来补偿D/A转换引起的信号幅度衰减,从而提高DDS输出信号的幅度特性.实验结果表明此方法在0 Hz～40 MHz频率范围内可提高输出信号平坦度2 dB左右.
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| 关 键 词： | 直接数字频率合成 D/A转换 幅频特性 |
| 文章编号： | 1000-8829（2007）08-0009-03 |
| 修稿时间： | 2007-10-17 |
A Method for Improving Amplitude Frequency Characteristic of DDS Signal Source |
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| WANG Wen-liang,TIAN Shu-lin,LIU Ke.A Method for Improving Amplitude Frequency Characteristic of DDS Signal Source[J].Measurement & Control Technology,2007,26(8):9-11. |
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| Authors: | WANG Wen-liang TIAN Shu-lin LIU Ke |
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| Affiliation: | School of Automation Engineering, University of Electronic Science and Technology, Chengdu 610054, China |
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| Abstract: | The amplitude-frequency characteristic of DDS signal is analyzed after D/A conversion firstly. Then a method for improving amplitude-frequency characteristic is put forward. This method is based on characteristic of LC parallel circuits that signal can be amplified at resonance frequency. By this method, amplitude attenuation caused by D/A conversion is compensated; amplitude frequency characteristic of DDS signal is improved. The experiment results indicate that amplitude flatness of arbitrary waveform generator is increased by about 2 dB at 0 Hz - 40 MHz. |
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| Keywords: | direct digital synthesis D/A conversion amplitude-frequency characteristic |
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