有源模拟滤波器的快速协同设计方法

Rapid collaborative design method of active analog filter

为了解决有源模拟滤波器传递特性函数设计中手工计算方法复杂、时间长,查表法精度不高的问题,提出了一种快速协同设计方法,该方法先通过在MATLAB环境下将基于频率变换的有源模拟滤波器传递函数设计方法程序化,之后只需给出滤波器电压衰减设计指标和边界频率即可快速获得滤波器传递函数或其二阶级联传递函数中各多项式的系数并在此基础上进行电路综合,大大缩短了设计时间,最后通过EDA工具Pspice对其综合的电路进行性能指标的仿真,进一步验证和完善设计方案,为电路实现的可行性提供了可靠的保障。仿真实验结果表明协同设计方法快速、直观、准确,大大提高了设计效率,对有源模拟滤波器特别是高阶滤波器的设计具有很好的实际指导意义。

In order to solve the problems in the design of transfer function for active analog filter, such as long time and tedious manual calculation and low precision table look-up, a kind of rapid collaborative design method for active analog filter is proposed. First, transfer function design based on frequency transform is programmed in MATLAB, then coefficients of transfer function or second order cascade transfer function are given rapidly according to the voltage attenuation index and edge frequency based on MATLAB program. With the above results, it can greatly shorten the time of circuit synthesis. Finally,the filter circuit performance simulation is presented through EDA/Pspice,which furtherly verifies and improves the design. All of these provide a reliable guarantee to the feasibility of circuit realization. The simulation results show that the collaborative design method is fast,intuitionistic and accurate, it also enhances the design efficiency greatly. This method plays a practical introductive significance on active analog filter＇s design especially for high order filter design.