A method to improve the accuracy of adjustable phase difference of signal generator

Direct digital frequency synthesis (DDFS) technology is applied widely in traditional fields which need signal source since it has a lot of advantages such as high frequency resolution, fast frequency setting and conversion speed and so on. Based on the working principle of DDFS, it is very important to calculate the phase control word when synthesizing the continuous adjustable phase difference signals. To address the shortcoming of large computation, low efficiency of phase difference setting, more storage space occupied or significant cumulative errors of phase setting when calculating phase control word with traditional methods, a novel algorithm for computing phase control word is studied 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 phase setting speed and precision in signal generator.