Abstract
The direct digital frequency synthesizer (DDS) is a new kind of all digital frequency synthesizer, which has fast frequency switching speed and high frequency resolution. It has been widely used in the field of signal processing. In this article, we analyze the basic principle of DDS and study several methods of phase-amplitude conversion. We use the method of searching ROM table for rough rotation and the optimized CORDIC algorithm based on excess-fours structure for fine rotation to achieve the phase to amplitude conversion. The power consumption and area of the fine rotation element are reduced with the preprocessing of the phrase. The output frequency is increased by using a 4-channel-interpolation structure. After the design is completed, we verify its correctness and evaluate its performance. The results show the phase-amplitude conversion algorithm meets the need of correctness and the DDS can work stably at 1GHz.
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