类梳状补偿滤波器设计与仿真  

The Designing and the Simulation of the SCC＿CIC Compensation Filter

作　　者：张磊[1] 狄建国 吴淑婷 王建新[1] 方熙 ZHANG Lei;DI Jian-guo;WU Shu-ting;WANG Jian-xin;FANG Xi(Beijing Electronic Science and Technology Institute,Beijing 100070,China)

机构地区：[1]北京电子科技学院,北京100070

出　　处：《电子学报》2018年第8期1997-2003,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61701008)

摘　　要：积分梳状(CIC:cascaded integrator comb)滤波器由于具有运算速度较快,占用资源少等优点,而被广泛应用于多信号抗混叠系统中.针对传统CIC滤波器因简单级联而带来的通带失真增大和阻带衰减减小的缺陷,本文基于CIC滤波器的传递函数以及频谱特性分析,提出了一种类梳状补偿滤波器(SCC_CIC:similar to comb compensation CIC)的设计方案,根据实际需要调整参数和来满足设计要求.同时,利用多相分解技术重构滤波器结构,提升了整个系统的运行效率,且实现复杂度较低.通过MATLAB仿真实验及分析,相比N=2的同级联数的传统CIC滤波器、ISOP_CIC(interpolated second-order polynomials CIC)和SCIC(sharpening to cascaded integrator-comb)滤波器,SCC_CIC滤波器在fs处的阻带衰减分别增加近了80d B、60d B和70d B,在fc处分别补偿通带失真97.3%、90.1%和-2%,整个滤波器的运算量减小到1/D,滤波器的精确度基本保持一致,使得SCC_CIC能够较好地应用在抗混叠滤波系统中.For the advantage of high speed in computing and very limited consumption of resource,CIC(cascaded integrator comb)filter has been widely used in Multi-signal anti-aliasing systems.In this paper,we proposed a SCC_CIC(similar to comb compensation CIC)filter based on the transfer function of CIC filter and the analysis of its spectrum characteristics.The SCC_CIC filter could combat the disadvantage of high pass-band distortion and low stop-band attenuation brought by filter cascading.In practice,we could adjust parameter C1 and K to satisfy the requirement of the system.In addition,by reconstructing the structure of the filter with the aid of poly-phase decomposition technique,the efficiency of the system could be improved evidently.As shown in numerical Montel-Carlo simulation results,compared with the traditional CIC,the ISOP_CIC(interpolated second-order polynomials CIC)and the SCIC(sharpening to cascaded integrator-comb)filters,the advantage of the SCC_CIC for the stop-band attenuation is approximately 80dB、60dB and 70dB,respectively.Compared with the CIC,the ISOP_CIC,and the SCIC filter,the advantage for the pass-band distortion of our method has been improved by approximately 97.3%、90.1%and-2%accordingly.For the SCC_CIC filter,the total computation complexity could be decreased to 1/D the complexity required by the CIC filter.These advantages facilitate the application of the SCC_CIC filter in numeral Multi-signal anti-aliasing systems.

关 键 词：积分梳状滤波器 类梳状补偿滤波器 通带失真 阻带衰减 多相分解 抗混叠滤波 

分 类 号：TN918[电子电信—通信与信息系统]