Phase adjustment device, phase adjustment method, and semiconductor integrated circuit

A semiconductor integrated circuit comprising,

• a phase adjustment device which adjusts a phase difference between a first output pulse signal and a second output pulse signal according to a phase difference between a first input pulse signal and a second input pulse signal,
• wherein said phase adjustment device includes:
• a first selection unit operable to select one of the first input pulse signal and an adjustment pulse signal that is used for adjustment;
• a second selection unit operable to select one of the second input pulse signal and the adjustment pulse signal;
• a first delay unit operable to delay the signal selected by said second selection unit, and a delay amount of said first delay unit is adjustable;
• a first output unit operable to output, as the first output pulse signal, the signal selected by said first selection unit;
• a second output unit operable to output, as the second output pulse signal, the signal delayed by said first delay unit;
• and
• a phase adjustment unit operable to adjust the delay amount so as to equalize phases of the first output pulse signal and the second output pulse signal, in the case where both said first selection unit and said second selection unit have selected the adjustment pulse signal.

A phase adjustment method for use by a phase adjustment device which adjusts a phase difference between a first output signal and a second output pulse signal according to a phase difference between a first input pulse signal and a second input pulse signal, the phase adjustment device including:

• a first selection unit operable to select one of the first input pulse signal and an adjustment pulse signal that is used for adjustment;
• a second selection unit operable to select one of the second input pulse signal and the adjustment pulse signal;
• a first delay unit operable to delay the signal selected by the second selection unit, and a delay amount of the first delay unit is adjustable;
• a first output unit operable to output, as the first output pulse signal, the signal selected by the first selection unit;
• and
• a second output unit operable to output, as the second output pulse signal, the signal delayed by the first delay unit;
• wherein said phase adjustment method comprises:
• selecting the adjustment pulse signal by the first selection unit and the second selection unit;
• adjusting the delay amount so as to equalize phases of the first output pulse signal and the second output pulse signal, in the case where both the first selection unit and the second selection unit have selected the adjustment pulse signal;
• selecting the first input pulse signal by the first selection unit, and selecting the second input pulse signal by the second selection unit;
• and
• propagating and outputting the first input pulse signal and the second input pulse signal using the delay amount adjusted in said adjusting of the delay amount.