基于FPGA的IIR数字滤波器设计方法

Study on FPGA-based IIR Digital Filter Design Method

针对信号输入中锁相环的环节,设计并实现一种基于现场可编程门阵列(FPGA)的IIR数字滤波器。首先,基于Matlab的Filter Tools设计滤波器的通带频率,阻带频率。得到滤波器系数后进行Matlab仿真,之后进行参数量化处理。将滤波器结构使用硬件描述语言描述滤波器结构后联合ModelSim进行定点化仿真。实验结果表明,滤波前后低频信号频谱更加清晰,提高了低频信号质量,增强了应变信号采集系统的功能性和集成度。

Aiming at the phase-locked loop link in signal input,design and implement an IIR digital filter based on Field Programmable Gate Array(FPGA).First,design the passband frequency and stopband frequency of the filter based on Filter Tools of Matlab.After obtaining the filter coefficients,perform Matlab simulation,and then perform parameter quantization processing.The filter structure is described by the hardware description language and then combined with ModelSim for fixed-point simulation.Experimental results show that the frequency spectrum of the low-frequency signal before and after filtering is clearer,which improves the quality of the low-frequency signal and enhances the functionality and integration of the strain signal acquisition system.