CIC for decimation and interpolation using Xilinx system generator

Abstract

In this paper a Cascaded integrated comb (CIC) filter, an optimized class of linear filters such as FIR is implemented for digital up conversion (DUC) and digital down conversion (DDC) for efficient transmission and reception in multirate system. CIC filters are often used for the purpose of reducing sampling rate (decimation) and increasing sampling rate (interpolation). Our work is to show the efficiency of CIC filters over FIR filters in fixed point applications. Single stage CIC filter and multistage CIC filters for interpolation and decimation are realized. Here multirate filter design models for decimation and interpolation are developed using Xilinx system generator. Also multirate filters are further improved by cascading various CIC filter stages.