基于FPGA的切比雪夫梳状补偿滤波器  

Chebyshev comb compensation filter based on FPGA

作　　者：陈志 武斌 CHEN Zhi;WU Bin(School of Computer and Information Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津城建大学计算机与信息工程学院,天津300384

出　　处：《量子电子学报》2020年第1期15-21,共7页Chinese Journal of Quantum Electronics

基　　金：国家高技术研究发展计划(863计划),2015BAF09B02-3。

摘　　要：积分梳状(CIC)滤波器因结构简单和良好的抗混叠性,被应用于各种信号处理系统中.针对传统CIC滤波器通带失真较大和阻带衰减较小的问题,通过分析CIC滤波器的特点,提岀了一种切比雪夫梳状补偿滤波器(C-CIC).MatLab仿真结果表明,与传统CIC、内插二阶多项式级联积分梳状滤波器(ISOP-CIC)和余弦积分梳状滤波器(CIC-COSINE)相比,当CIC级联的级数相同时,C-CIC滤波器在频率fc处通带幅值的失真和频率%处的阻带衰减都得到了较大改善.经过FPGA的设计工具Quartus仿真得知,达到相同的幅频特性时,C-CIC滤波器消耗的片上资源少于ISOP-CIC和CIC-COSINE滤波器.C-CIC滤波器可以更好地应用于波长调制-可调谐二极管激光吸收光谱(TDLAS)系统中.For the advantage of simple structure and good anti-aliasing,cascaded integrator comb(CIC)filter has been widely used in a variety of signal processing systems.Aiming at the problem of large passband distortion and small stopband attenuation of the traditional CIC filter,a Chebyshev cascade integral comb(C-CIC)filter is proposed by analyzing the characteristics of CIC filter.The simulation results using MatLab show that compared with the traditional CIC,interpolated second-order polynomial cascade integral comb filter(ISOP-CIC)and cosine integral comb filter(CIC-COSINE),the C-CIC filter has a large improvement in passband distortion at frequency fc and stopband attenuation at frequency/a when the number of CIC cascades is the same.According to the Quartus simulation,design tool of FPGA,the C-CIC filter consumes less on・chip resources than the ISOP・CIC and CIC-COSINE filters when the same amplitude-frequency characteristics are achieved.It is indicated that the C-CIC filter can be bet ter used in tu nable diode laser absorption spectrometer(TDLAS)system.

关 键 词：光谱学 切比雪夫梳状补偿滤波器 窗函数 积分梳状滤波器 现场可编程逻辑器件 

分 类 号：TN713[电子电信—电路与系统]