Phase-locked loop device, and operating method of the device

Abstract

A phase-locked loop device and a method for operating the same, including: a voltage-controlled oscillator configured to generate an output clock signal; a divider configured to divide the output clock signal into a first phase division signal; a sampling phase frequency detector configured to: receive a first supply voltage, a second supply voltage different from the first supply voltage, and the first phase division signal, and based on determining that a phase difference between the first phase division signal and a reference clock signal corresponds to a first interval, output a hold voltage and a status signal for the phase difference; a transconductance circuit configured to output a first conversion current based on the hold voltage; a charge pump configured to output a second conversion current based on the status signal; and a loop filter configured to provide a voltage control signal to the voltage-controlled oscillator.