Abstract:

When using direct digital synthesizer (DDS) technology to generate sine signals, the amplitude precision and the look-up table scale restrict each other; a largescale look-up table for high precision output is often impractical owing to the limitation of capacity. To this problem, a high-precision sine signal generation algorithm based on compressed look-up table is proposed. Firstly, an analysis is given between the relationship of the DDS precision and the look-up table scale, which provides theoretical rules for the design of the look-up table. Then, an efficient compressed look-up table is constructed according to the requirement of precision, the relationship between look-up table scale and compression ratio is given. Finally, the implementation of the algorithm is presented, signal precision and compression ratio are confirmed through simulation, for a signal with an amplitude of 10⁶ and a precision of 10^-5, the compression ratio of 10⁷ is obtained.