Importance

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Abstract

A phase comparator functions to compare phases of a reference clock signal and a feedback clock signal, and output a voltage rising and a voltage falling signals based on a phase difference, to output a rising reset and a falling reset signals having a pulse width of the voltage rising and the voltage falling signals when the phase difference is zero every time the phase frequency comparator outputs the voltage rising and the voltage falling signals, to output a first current based on the voltage rising and the voltage falling signals, and output a second current based on the rising reset and the falling reset signals, and having a capacitor charged with the first current and the second current, to output a current based on a difference between the charges by the first current and the second current.

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First Claim