| 一种新型的跟踪低通滤波器 |
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| 引用本文： | 李敏, 刘京诚, 刘俊, 罗勇,.一种新型的跟踪低通滤波器[J].电子器件,2007,30(4):1239-1241,1245. |
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| 作者姓名： | 李敏 刘京诚 刘俊 罗勇 |
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| 作者单位： | 1. 四川理工学院机电工程系,四川,自贡,643033
2. 光电技术及系统教育部重点实验室,重庆,400044 |
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| 摘 要： | 介绍了一种新型的跟踪低通滤波器的原理及实现方法.该跟踪低通滤波器用八阶椭圆型开关电容滤波器MAX293构成低通滤波电路,输入信号的频率通过单片机的测量、修正、倍频处理后输出作为MAX293的时钟控制频率,用以控制MAX293的截止频率从而实现跟踪滤波.实验证明,对于0.1 Hz～25 kHz的信号,跟踪低通滤波器的截止频率相对误差小于1%.
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| 关 键 词： | 低通滤波器 自动跟踪 傅里叶变换 截止频率 MAX293 |
| 文章编号： | 1005-9490（2007）04-1239-03 |
| 修稿时间： | 2006-08-31 |
A Novel Tracking Low-Pass Filter |
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| LI Min,LIU Jing-cheng,Liu Jun,Luo Yong.A Novel Tracking Low-Pass Filter[J].Journal of Electron Devices,2007,30(4):1239-1241,1245. |
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| Authors: | LI Min LIU Jing-cheng Liu Jun Luo Yong |
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| Affiliation: | Department of Mechanical-electrolic Engineering,Sichuan University of Technology &Engineering,Zigong Sichuan 643033,China;2.Ministry of Education key Optoelectronic technology & system Lab,Chongqing 40044,China |
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| Abstract: | The principle and method of the tracking low-pass filter were discussed. The MAX293, a special chip for filtering purpose, formed the nucleus of the low-pass filtering circuit. A single chip microcomputer was used to measure and multiplicate the frequency of tracked signal. By using the frequency-multiplicated signal to control the clock of MAX293, the tracking filtering was implemented. Experiment result shows that the effect of the filtering is very good at the range of frequency bettween 0. 1 Hz and 25 KHz. |
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| Keywords: | low-pass filter automatic tracking Fourier transform cut-off frequency MAX293 |
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