High-precision sine signal generation based on compressed look-up table
Siliang Wu · Systems engineering and electronics · 2012
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.