Realization of CIC Filter Based on FPGA

In software defined radio system,in order to resolve the pressure problem of huge data quantity to DSP computation in the baseband after intermediate frequency sampling,uses the technique of multi-rate processing.Multi-rate processing need to use integrator comb filter,half-band filters and high-FIR filter.This paper analyses the CIC filter structure and characteristics,introduces an effective method basic on FPGA to realize the filter.In the end,the exactness and feasibility of this method are verified by timing simulation with Quartus II,this method can be used in practice.