Phase frequency detector

Abstract

Provided is a phase frequency detector for use in a phase locked loop (PLL) or a delay locked loop (DLL), the phase frequency detector including: an UP signal output unit having a first stage operated according to a reference clock delayed by a predetermined time and a reset signal, a second stage operated according to the reference clock and an output of the first stage, and an inverter for inverting an output of the second stage; a DOWN signal output unit having: a first stage operated according to an outer clock delayed by a predetermined time and the reset signal, a second stage operated according to the outer clock and an output of the first stage, and an inverter for inverting an output of the second stage; and a logic gate logically combining the output of the second stage of the UP signal output unit and the output of the second stage of the DOWN signal output unit to generate the reset signal, thereby a phase range of the input signal with which an effective control signal can be obtained is wide so that low power consumption and low noise characteristics can be obtained due to fast phase lock, low power consumption of a dynamic logic, and fast signal transmission.