Phase adjustment circuit, control method, and measurement method

A phase adjustment circuit, comprising:

• a phase interpolator configured to generate an output signal based on a current distribution ratio, the phase interpolator comprising a plurality of input pairs;
• and
• a phase rotator configured to select a first input pair and a second input pair from the plurality of input pairs,
• wherein the phase rotator is further configured to sequentially switch a plurality of currents, which are associated with the current distribution ratio, from flowing through the first input pair to flowing through the second input pair, in order to correspond a phase of the output signal to a first phase interval,
• wherein after the plurality of currents flow through the second input pair, the phase rotator is further configured to select the second input pair and a third input pair from the plurality of input pairs, and to adjust the current distribution ratio to correspond the phase of the output signal to a second phase interval, wherein the first phase interval and the second phase interval are continuous.

A measurement method, comprising:

• switching a current distribution ratio of a phase interpolator back and forth between an initial ratio and a first ratio, in order to generate a first jitter signal component, wherein the phase interpolator is configured to determine a phase of an output signal based on the current distribution ratio;
• switching the current distribution ratio back and forth between the initial ratio and a second ratio, in order to generate a second jitter signal component;
• measuring the output signal, in order to analyze a first total energy of phase noises, which is associated with the first jitter signal component, and a second total energy of phase noises, which is associated with the second jitter signal component, in the output signal;
• and
• determining whether a change of the phase is monotonic based on the first total energy of phase noises and the second total energy of phase noises.