Study on spectrum stray of DDS signal

摘要

DDS(Direct Digital Synthesis) is a new method of Frequency Synthesis by which the linear phase sequence of sine wave is converted to amplitude sequence. And the sine wave with specific frequency is obtained when the amplitude sequence is drived into D/A and low-pass filter .The disadvantage of DDS is it brings big stray, narrow bandwidth. The paper explore the ways to reduce stray arise from phase Interruption, amplitude quantification, the nonlinearity of DAC.