程控状态变量RC有源滤波器的优化综合技术

介绍了基于Butterworth传递函数的二阶状态变量RC有源滤波器的优化综合技术,进而给出了一种由单片机参与的能自动跟踪输入信号频率、选择合适滤波器截止频率的程控滤波系统实例.其特点是实现电路简洁,网络参数易确定,调试方便,截止频率解析式明确,且有较好的精度,其电路和设计方法在数据采集和工程测试等领域有较好的应用参考价值.

Optimum synthesis technology of program controlling state variable RC active filter

The paper introduced an optimum synthesis technology of second order state variable RC active filter based on Butterworth transfer function.Moreover,it put forward a program control filtering system based on single chip,which will trace the frequency of input-signal automatically and select suitable cut-off frequency of filter.The filter system is simple in circuit designing,easy in net parameter selecting,convenient in testing,and high in accuracy,with explicit frequency analysis function.Both its circuit and its method of designing are worth referring to in many field,such as data acquisition and engineering measurement.