| 一种DAC非线性的补偿方法 |
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| 引用本文： | 伍尚坤,吴义华,宋克柱.一种DAC非线性的补偿方法[J].中国科学技术大学学报,2006,36(3):264-267. |
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| 作者姓名： | 伍尚坤 吴义华 宋克柱 |
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| 作者单位： | 中国科学技术大学近代物理系快电子学实验室,安徽,合肥,230026 |
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| 摘 要： | 提出了基于快速傅立叶变换（FFT）和最小二乘法拟合相结合的幅度、频率和相位信息的提取算法.在此基础上,给出了一种DAC非线性补偿的新方法,用于改善DAC输出正弦信号的谐波畸变.仿真结果显示该方法可以将DAC输出信号的谐波失真降低35 dB.实测结果表明这一方法能把谐波失真降低20 dB.
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| 关 键 词： | 相位提取 补偿 快速傅立叶变换 最小二乘法 |
| 文章编号： | 0253-2778(2006)03-0264-04 |
| 收稿时间： | 01 14 2005 12:00AM |
| 修稿时间： | 05 20 2005 12:00AM |
A compensation method to DAC's nonlinearity |
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| WU Shang-kun,WU Yi-hua,SONG Ke-zhu.A compensation method to DAC''''s nonlinearity[J].Journal of University of Science and Technology of China,2006,36(3):264-267. |
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| Authors: | WU Shang-kun WU Yi-hua SONG Ke-zhu |
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| Institution: | Fast Electronics Lab, Dept. of Modern Physics, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | An algorithm is presented to extract amplitude, frequency and phase information from a frequency spectrum based on FFT and the least square algorithm. Using this algorithm, a new method is given for compensating for the nonlinearity of a DAC. The method is applied to ameliorating the harmonic distortion of the sine signal output by a DAC. Simulation results indicate that the harmonic distortion can be improved by 35 dB using this method. The experiment has produced waveforms that have a 20 dB reduction in harmonic distortion. |
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| Keywords: | DAC |
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