PHASE COMPARATOR AND PHASE LOCKED LOOP

摘要

A phase comparator that solves the problem that VCOs cannot be controlled with high precision. A frequency divider part frequency divides, in stages, a VCO signal supplied to an input terminal (10) and outputs the VCO signals obtained in the respective stages. A latch part latches, based on a reference signal supplied to an input terminal (11), the VCO signal supplied to the input terminal (10) and the VCO signals outputted by the frequency divider part. An output part outputs latch results of the latch part as phase difference signals representative of the differences in phase between the reference signal and the VCO signals.