Optimal Design of Three-Phase Precise Programmable Standard Source DDS Structure
Liu Bao-lia · Electrical Measurement & Instrumentation · 2013
This paper optimizes the traditional DDS structure based on the analysis of frequency resolution and phase resolution of traditional DDS technology, which are negative power of 10 without mantissa. So the accuracy of frequency and phase is improved. Through the reasonable selection of sampling points number and sine value bits number, the spurs caused by phase truncation is effectively reduced and the SNR is raised. The paper designs the three-phase precise programmable standard source on the basis of optimized DDS, which can overlape 2 ~31harmonic. The output wave transition is smooth without oscillation and peak burr. The error of output fundamental voltage and current is less than 0.05% and the frequency resolution is high.