| 采集系统通道传输特性校正 |
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| 引用本文： | 宋千,陆必应,梁甸农.采集系统通道传输特性校正[J].数据采集与处理,2002,17(1):85-89. |
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| 作者姓名： | 宋千 陆必应 梁甸农 |
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| 作者单位： | 国防科技大学电子科学与工程学院,长沙,410073 |
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| 基金项目： | 国家部委基金 (编号 :7.5 .3.2 )资助项目 |
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| 摘 要： | 采集系统中ADC前端的抗混迭滤波器等模拟器件通常会对通道传输特性带来较大的幅相误差，对这些误差可以采用将采样序列通过数字校正滤波器的方法校正。本文首先介绍了校正通道幅相误差的几种办法，指出幅相误差必须同时校正以得到最佳性能；然后给出了求解逼近给定幅相频率响应的FIR实系数滤波器的线性规划方法；最后，作者将这一算法应用在700Msps通道的双通道数据采集系统中，取得了很好的校正效果。
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| 关 键 词： | 校正 线性规划 FIR滤波器 数据采集系统 通道传输特性 |
| 文章编号： | 1004-9037(2002)01-0085-05 |
| 修稿时间： | 2001年2月22日 |
Correction to Transform Function of Data Acquisition Channel |
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| Song Qian Lu Biying Liang Diannong Electronic Science and Engineering School,National University of Defense Technology Changsha ,P.R.China.Correction to Transform Function of Data Acquisition Channel[J].Journal of Data Acquisition & Processing,2002,17(1):85-89. |
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| Authors: | Song Qian Lu Biying Liang Diannong Electronic Science and Engineering School National University of Defense Technology Changsha PRChina |
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| Affiliation: | Song Qian Lu Biying Liang Diannong Electronic Science and Engineering School,National University of Defense Technology Changsha 410073,P.R.China |
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| Abstract: | The anti-alias lowpass filters in data acquisition systems induce significant errors to trasfer characteristic of acquisiton channels, and these errors can be digitally corrected by using digital correction filters. This paper introduces approaches to reduce the distortion of trasfer channels firstly. Then a linear programming method is proposed to construct the FIR filter correcting the amplitude and phase errors simultaneously. Finally, this method is used to a 700 Msps/channel 2-channel high-speed data acquisition system, and the results prove that the method is feasible and efficient. |
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| Keywords: | data acquisition correction linear programming FIR filter |
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