Abstract: In the research of electronic circuit, different frequency has different the requirements of phase shift. However, under the influence of input waveform, traditional way of RC phase shift has the disadvantage of inconvenience, disperse phase shift points, the change of phase shift angles with load and time, etc.Based on DDS technology, the all-phase broadband precision digital phase shifter overcomes the limits of traditional ways.It can achieve a precise 360° all-phase shift phase, continuous change of frequency, and flexible operation without drifting. This paper introduces  principles and methods of digital phase shifter based on DDS.

Key words: DDS digital phase shifter, All-phase, High precision, Broadband