Design of CIC Filter Based on FPGA

CIC(cascade integrator comb,CIC) filter was one kind of filter which had simple,neat structure,took few reserves and did not need the multiplier.Therefore,it took few resources,implemented simply and had higher speed.In the high speed extraction or interpolation system,this filter was an extremely effective unit and the one kind of extremely effective structures of high decomposition speed filter.The general structure of CIC filter was introduced and the 2 basic units of CIC filter were demonstrated and the essential significance of CIC filter was analyzed through its transfer function;Using Hogenaur extermination theory to solve the non-running time overflow problem produced at output point.The realization method of CIC filter on FPGA was discussed.