A New Class of Low Complexity Low-Pass Multiplierless Linear-Phase Special CIC FIR Filters

This letter presents a new class of selective low-pass multiplierless linear-phase special CIC FIR filter functions of low complexity given in an explicit cascaded compact form. Several examples of the proposed filters are illustrated. They are compared in a fair way with conventional CIC FIR filters for the equal values of group delay and the same number of cascade sections. An example of the new class of the proposed seventh order filter with nine cascades is presented, where its stopband attenuation has high value of 143.82 dB, while corresponding conventional CIC FIR filter with the same filter order and the number of cascades has only 115.18 dB.