Design and FPGA implementation of flexible and efficiency digital down converter

Digital down converter (DDC) is the one of the key technologies in the field of software define radio (SDA). Compared with traditional ASIC DDC devices, DDCs implemented by FPGA have more flexible frequency and phase characteristics and higher precision computation. The paper designed and implemented DDC with above advantages on Xilinx FPGA Virtex-5. Through analyzing the key points of DDC theory and MATLAB simulation analysis, DDC with across clock region and FIFO interface characteristics is designed using Xilinx ISE. Some important and practical implementation details are given in this paper. And finally presents one application of DDC in communication systems by the portions given in this document.