摘要
采用计算法设计有源低通二阶滤波器,其电路从集成运放输出到同相输入间引入一个负反馈,该反馈使滤波器只允许低频端的信号通过,实现低通滤波。用查表法设计,已知电路响应特性、形式、类型及阶数、滤波器性能参数,再根据截止频率,选定电容标称值,查表求出相应电容值及电阻值,通过计算得到设计值以确定电路参数。
The Active low-pass second order filter is designed with computing method, and a negative feedback was imported between input and amplification output of integrate circuit. The negative feedback made the signal of low frequency to pass the filter to realize low-pass filtering. For Table lookup design, firstly, know response characteristic, shape, type and order of circuit, and performance parameter of the filter. According to cut-off frequency, the nominal value of capacitance was selected, and the corresponding capacitance value and resistance value was extracted through table lookup. And then, the capacitance value and resistance value was computed to get design value to define circuit parameter.
出处
《兵工自动化》
2005年第4期85-85,88,共2页
Ordnance Industry Automation
关键词
有源滤波器
低通二阶滤波
计算法
查表法
Active wave filter
Low-pass second order filter
Computing method
Table lookup
