Design and Implementation of DDS Based on FPGA

A design scheme of DDS system based on FPGA is introduced for the merits of fast frequency conversion time and high resolution of DDS.The design of the phase accumulator and ROM lookup table which are the cores of DDS is achieved with the Quartus Ⅱ development software produced by Altera Company.The phase continuous and frequency variable signal can be obtained with design scheme.The download of DDS hardware is implemented by E2PROM based on MCU allocation FPGA,the time sequence simulation of each module and system is completed.After designing and testing circuit,it illustrates the validity of DDS.As the advantage of the programmable of FPGA,it is convenient to modify,add and optimize the functionof DDS.