| 基于状态变量法的程控滤波器 |
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| 引用本文： | 张望先,李璐,李飞飞,李腾飞,谢红生. 基于状态变量法的程控滤波器[J]. 实验室研究与探索, 2011, 30(9): 67-69 |
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| 作者姓名： | 张望先 李璐 李飞飞 李腾飞 谢红生 |
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| 作者单位： | 1. 武汉大学电子信息学院,武汉湖北,430079
2. 河南省濮阳供电公司,河南濮阳,457000 |
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| 摘 要： | 为了实现程控滤波的功能,采用状态变量的方法,给出了一种单片机控制的程控滤波器实例。采用两组二阶状态变量滤波器级联,实现了低通、高通、带通输出,并将数模转换器等效为可控电阻,使得截止频率可调。整个电路滤波效果理想,精度高,调试方便,成本低廉。
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| 关 键 词： | 状态变量 程控滤波 可控电阻 |
Programmable Filter Based on Programmable State Variable Method |
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| ZHANG Wang-xian,LI Lu,LI Fei-fei,LI Teng-fei,XIE Hong-sheng. Programmable Filter Based on Programmable State Variable Method[J]. Laboratory Research and Exploration, 2011, 30(9): 67-69 |
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| Authors: | ZHANG Wang-xian LI Lu LI Fei-fei LI Teng-fei XIE Hong-sheng |
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| Affiliation: | ZHANG Wang-xian1,LI Lu1,LI Fei-fei1,LI Teng-fei1,XIE Hong-sheng2(1.School of Electronic Information,Wuhan University,Hubei 430079,China,2.Henan Puyang Power supply Company,Henan 457000,China) |
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| Abstract: | In order to achieve programmable filtering functions,the system uses the state variable approach,giving an example of programmable filter controlled by an SCM.Adopting two cascaded second-order state variable filter it can achieve low pass,high pass,band-pass output,and using the digital to analog converter as the program-controlled equivalent resistance,making the cutoff frequency adjustable.The entire circuit has high accuracy,convenient debugging,and low cost. |
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| Keywords: | state variables programmable filter program-controlled equivalent resistance |
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