Importance

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Abstract

A circuit device includes: a first phase comparison circuit including a sampling circuit that samples a feedback signal based on a reference clock signal; a first charge pump circuit configured to output a current corresponding to a sampling voltage; a second phase comparison circuit including a dead zone detection circuit that detects whether a phase difference between the reference clock signal and a feedback clock signal falls within a dead zone, and configured to output a phase difference signal when the phase difference does not fall within the dead zone; a second charge pump circuit; and a clock signal generation circuit configured to generate the clock signal having a frequency controlled based on an output of the first charge pump circuit or the second charge pump circuit. The second charge pump circuit is set disabled or in a low power consumption mode in a dead zone period.

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First Claim