Patent attributes
A phase adjustment circuit includes: a carrier-wave-delay adjusting circuit for delaying an input carrier wave and outputting the delayed carrier wave, in accordance with phase information; and a phase-difference detecting/adjusting circuit for detecting a phase difference between an input signal and the delayed carrier wave, outputting, as the phase information, a value according to the detected phase difference, adjusting the delayed carrier wave such that the delayed carrier wave has a phase substantially coincident with a phase of the input signal, and outputting the resultant carrier wave as a phase-adjusted carrier wave. In a steady state, the phase-difference detecting/adjusting circuit outputs, as the phase information, a value indicating the presence of a phase difference.
