To improve the transient response performance when a phase comparator is switched.

The signaling arrangement which switches different phase comparators 2A and 2B making phase comparisons between a reference signal (r) and an output signal (a) by a selector 3 according to conditions required for an output signal (a) to generate the output signal (a) synchronized with the reference signal (r) is equipped with a phase adjusting means 1 which adjusts the phase relation of the reference signal (r) inputted to the phase comparators 2A and 2B so that error signals ga and gb outputted from the phase comparators 2A and 2B are in phase with each other.