On design of efficient comb decimator with improved response  

作　　者：刘全 Gao Jun Huang Gaoming 

机构地区：[1]Department of Communication Engineering,Naval University of Engineering,Wuhan 430033,P.R.China

出　　处：《High Technology Letters》2012年第2期202-207,共6页高技术通讯（英文版）

基　　金：Supported by the China Postdoctoral Science Foundation （20080431379）.

摘　　要：A three-part comb decimator is presented in this paper, for the applications with severe requirements of circuit performance and frequency response. Based on the modified prime factorization method and multistage polyphase decomposition, an efficient non-recursive structure for the cascaded integrator-comb （CIC） decimation filter is derived. Utilizing this structure as the core part, the proposed comb decimator can not only loosen the decimation ratio＇s limitation, but also balance the tradeoff among the overall power consumption, circuit area and maximum speed. Further, to improve the frequency response of the comb decimator, a cos-prefilter is introduced as the preprocessing part for increasing the aliasing rejection, and an optimum sin-based filter is used as the compensation part for decreasing the passband droop.

关 键 词：comb decimator cascaded integrator-comb （CIC） filter prime factorization polyphase decomposition 

分 类 号：TN92[电子电信—通信与信息系统] TN912.26[电子电信—信息与通信工程]