IIR数字滤波器的FPGA快速实现

A Rapid Implementation of IIR Digital Filter on FPGA

针对IIR(无限脉冲响应)滤波器的一般结构,提出了一种在FPGA上快速实现的方法。该方法根据滤波器网络结构,采用Matlab函数产生1组零极点参数且进行适当量化,据此构建IIR滤波器的差分方程并用VHDL语言实现。在Cyclone III系列EP3C40 FPGA中实现了磁悬浮主轴位移传感器取样信号低通滤波器。研究结果表明:该设计方法实现简捷、运算速度快、占用硬件资源少,具有一定的应用价值。

According to the common IIR （ infinite impulse response） filter structure,a method of fast implementation on FPGA is put forward.This method uses the Matlab function to produce a set of zero and pole parameters and quantify the parameters.The difference equation of IIR filter is constructed and implemented by using VHDL language.By using EP3C40 FPGA of CycloneIII series,the IIR low pass filter is implemented for a magnetic suspension spindle displacement sensor sampling signal.Results show that this design method is simple with a fast calculation speed and less hardware resources,which certainly has an application value.