Design of Modified CIC Decimation Filter and FPGA Implementation
Yingjie Lv · Modern Electronics Technique · 2009
A modified Cascaded Integral Comb(CIC) filter which improves the passband and stopband characteristics respect to the CIC filter is presented in this paper.A cascaded SINE filter is introduced after the COSINE one which improves the stopband characteristics to compensate the passband drop.Applying the new poly-phase decomposition as well as no-recursive structure,this filter not only greatly decreases the amount of memory,but also makes the circuit more regular.Simulation and FPGA verification result indicates that the stopband attenuation is up to 100.3 dB and the passband attenuation is only 0.000 1 dB.