CIC Filter Passband Sharpening Using Generalized Comb Filters

Generalized Comb 필터를 사용한 CIC 필터의 통과대역 Sharpening 기법

In this paper, a new CIC filter structure for reduction of passband droop in CIC decimation filter is proposed. For improvement of passband characteristics, the 1st order Generalized Comb Filter(UF) is proposed in addition to the conventional CIC decimation filter. By using this filter, it is shown that passband droop is remarkably reduced and aliasing attenuation is slightly increased. We also propose how to find the optimum filter coefficient Furthermora, it is shown that choices for GCF are possible in terms of the number of Half-Band filter. Passband droops and aliasing attenuations of the proposed structure are compared with those of the CIC structures using conventional sharpening techniques.