Digital phase interpolator

A digital phase interpolator, comprising:

• a first phase interpolating unit, a second phase interpolating unit, a first auxiliary interpolating unit, a second auxiliary interpolating unit, and a buffer unit;
• the first auxiliary interpolating unit is connected in parallel with the first phase interpolating unit between a first input signal and an input end of the buffer unit;
• the second auxiliary interpolating unit is connected in parallel with the second phase interpolating unit between a second input signal and the input end of the buffer unit, and there is a preset phase difference between the first input signal and the second input signal;
• an output end of the buffer unit is an output end of the digital phase interpolator;
• wherein, the first phase interpolating unit and the second phase interpolating unit both comprise N basic interpolating units connected in parallel, and weights of the first auxiliary interpolating unit and the second auxiliary interpolating unit are both half of the weight of the basic interpolating unit, wherein N is an integer greater than 1.