Patent ID: 7999531

Claim:
A phase detecting apparatus that detects a phase difference between signals, comprising: a phase comparing section that sequentially delays a second input signal relative to a first input signal, according to a set value, and that compares a phase of the second input signal to a phase of the first input signal each time a relative phase between the input signals changes; and a delay adjusting section that adjusts in advance a delay amount of a signal in the phase comparing section, wherein the delay adjusting section includes: a signal generating section that generates a first adjustment signal and a second adjustment signal, which has a period that is shorter than a period of the first adjustment signal by an amount corresponding to the set value, and inputs the first adjustment signal and the second adjustment signal to the phase comparing section as the first input signal and the second input signal, respectively; and an adjusting section that adjusts a delay amount of the phase in the phase comparing section based on the phase comparison result by the phase comparing section between the first adjustment signal and the second adjustment signal.