Fractional-N-PLL frequency synthesizer and phase error canceling method therefor

摘要

A fractional-N-PLL frequency synthesizer that reduces the spurious caused by a phase error is provided. A reference phase error is determined from a plurality of phase errors generated between a reference signal and a comparison signal when the fractional-N-PLL frequency synthesizer is locked. Then, any phase error equal to or smaller than the reference phase error is canceled.