IIR滤波，采用Verilog编写，用于数字滤波，有测试平台,硬件测试可用-IIR filter, written using Verilog for digital filtering, a test platform

此文件是一个Butterworth IIR滤波器的VHDL程序，此滤波器是10阶的，通带频率在2.5MHz——7.5MHz，采样频率为200MHz。此滤波性能不是很好，仅供参考。-This file is the VHDL program in a Butterworth IIR filter, this filter is 10 bands, the frequency of the passband of 2.5MHz- 7.5MHz sampling frequency is 200MHz