Semiconductor device for adjusting phases of multi-phase signals

A method of operation for a semiconductor device to adjust phases of a plurality of input signals, the method comprising:

• delaying the plurality of input signals by a plurality of delay codes to produce a plurality of output signals;
• for each of the plurality of output signals:
• generating a corresponding variable delay signal by delaying the output signal according to a variable delay code,
• generating a corresponding fixed delay signal by delaying by a fixed delay an output signal corresponding to a phase adjacent to a phase corresponding to the output signal, and
• generating a corresponding comparison signal by comparing a phase of the corresponding variable delay signal to a phase of the corresponding fixed delay signal, the corresponding comparison signal having a first value when the phase of corresponding variable delay signal precedes the phase of the corresponding fixed delay signal and having a second value when the phase of corresponding fixed delay signal precedes the phase of the corresponding variable delay signal;
• and
• adjusting, according to the comparison signals corresponding to the plurality of output signals, one or more of the plurality of delay codes or the variable delay code.