A Method to Reduce Error When Synthesizing Signal with Adjustable Frequency by Using DDS

Because of its own advantages, direct digital synthesis technology (DDS) is applied widely in traditional fields which need signal source. Based on the working principle of DDS, in the applying process, it is very important to calculate the frequency control word. To address the shortcoming of large computation, low efficiency of frequency setting, more storage space occupied or significant cumulative errors of frequency setting when calculating frequency control word with traditional methods, a novel calculation way for frequency control word is researched in this paper. This new method does not need large computation and more space and simultaneously it can decrease the error greatly, which plays an important role in improving the frequency setting speed and precision in signal generator.