High speed polyphase CIC decimation filters

Polyphase structures for CIC (cascaded-integrator-comb) decimation filters are proposed in this paper. With the new structures, the proposed filters can operate at much lower sampling rate yet achieve almost the same performance as Hogenauer's CIC filters. They have advantages in high speed operation and low power consumption. Issues such as high speed commutator design, polyphase components, finite word length, truncation, and rounding have been discussed. Some important applications are also given in this paper.