Research on Simplification Techniques of a Spur Suppressing Method in DDFS
Yuan Xue, Zhongsong Ma · 2020 IEEE 3rd International Conference on Electronics Technology (ICET) · 2020
While the Direct Digital Frequency Synthesis (DDFS) offers an efficient method to obtain digital signals of high-frequency, it also generates the spurious components inevitably, which limits its application in some demanding scenarios. Though the existing spur suppressing method based on piecewise linear approximation has a good performance, it still has some problems on complexity and expandability. Therefore, this paper analyzes the factors that influence the effect of spurious suppression in DDFS and presents some simplification techniques accordingly. Besides, an improved architecture is also presented to get better performance with less computational complexity. The results of the MATLAB simulation and the FPGA implementation have proven the effectiveness and simplicity of the proposed simplification techniques. At the same time the conclusions about parameter selection of DDFS can also provide an auxiliary reference for practical engineering application.