Cosine – Based Decimator

ABSTRACT A commonly used decimation filter is the cascadedintegrator-comb (CIC) filter, which consists of two main sections: an integrator and a comb, separated by a down-sampler. This ffilter is attractive in many applications because of its very low complexity which requires no multipliers and storages. The magnitude characteristic of this filter has a low attenuation in the stopband, and a droop in the desired passband, that is dependent upon the decimation factor M and the cascade size K. Additionally the integrator section works at the high input rate. In this paper we present a new decimation filter based on cosine filters. The proposed structure is a multiplier-free and has an improved magnitude response compared with that of the corresponding conventional CIC filter. Additionally there is no filtering at the high input rate.