The Realization Of DDS Function Generator Based On FPGA

Direct Digital Frequency Synthesis (DDS) is a newly developed technique which has many virtues, such as stabile output signal,continuous phase,high precision,easy control, etc. It is widely used in modern electron system.The thesis introduces the development and status of DDS, and analyzes some problems, such as the noise suppression of output signal noise. The various module designs of DDS function generator are finished by combining FPGA and DDS technology under the software QuartusⅡversion 6.0 environment. The thesis explains the design and realization ways of all the modules, such as using pipelining technique to implement the 32-bit phase accumulator, using NiosⅡto input and count frequency and adopting high performance analog IC to design waveform generator for reducing the size of the system, which play an very important role in improving the performance of the whole system.Finally, the thesis gives the simulation results of main modules and test results of the whole system. The results indicate that the function generator has basically realized the expected design target. The design proves that using single chip and FPGA to realize DDS random signal generator is feasible, and it also has many virtues, such as low price,easy design and reliable performance.