一种改进型CIC抽取滤波器的实现方法  

An implementation method of improved CIC decimation filter

作　　者：谢海霞 孙志雄 XIE Hai-xia;SUN Zhi-xiong(School of Electronic Communication Engineering,Tropical Ocean University of Hainan,Sanya 572022,Chin)

机构地区：[1]海南热带海洋学院电子通信工程学院,海南三亚572022

出　　处：《电子设计工程》2018年第14期162-166,共5页Electronic Design Engineering

基　　金：2016海南省自然科学基金项目(20166224)

摘　　要：针对传统CIC抽取滤波器处理宽带信号时,阻带衰减满足要求,通带衰减过大的问题,提出了一种改进CIC抽取器的设计方法;在分级抽取滤波器的基础上用锐化技术改善滤波器通阻带衰减,采用内插二阶多项补偿函数对通带进行额外补偿,使带内更平坦,并利用多相分解的方法降低了抽取滤波器采样率;仿真验证了改进型滤波器具有更好的通、阻带特性。最后在FPGA上实现这个改进型CIC滤波器的设计,并进行了时序仿真和综合验证。As traditional CIC decimation filter is dealing with the wideband signal,aiming at the problem that the stopband attenuation satisfies the requirement and the passband attenuation is too large,an improved CIC decimator design method is proposed;On the basis of the graded decimation filter,the attenuation of the filter bandwidth is improved by the sharpening technique,used to compensate the passband by interpolation of second order polynomial compensation function and the polyphaser decomposition method is adopted to reduce the sampling rate of the decimation filter;The simulation results show that the improved filter has better pass and stop band characteristics. Finally,the design of the improved CIC filter is realized on FPGA,and timing simulation and comprehensive verification are carried out.

关 键 词：CIC抽取滤波器 内插二阶多项式 多相分解 FPGA 

分 类 号：TN911.72[电子电信—通信与信息系统]