基于状态变量法的程控滤波器  

Programmable Filter Based on Programmable State Variable Method

作　　者：张望先[1] 李璐[1] 李飞飞[1] 李腾飞[1] 谢红生[2] 

机构地区：[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

出　　处：《实验室研究与探索》2011年第9期67-69,共3页Research and Exploration In Laboratory

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。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.

关 键 词：状态变量 程控滤波 可控电阻 

分 类 号：TN713[电子电信—电路与系统]