Delay phase-locked loop and phase discriminator circuit thereof

Abstract

The invention discloses a delay phase-locked loop and a phase discriminator circuit thereof, and the delay phase-locked loop comprises a start control circuit which is used for adjusting the initial state of an input reference signal and a to-be-locked signal entering a phase discriminator, wherein the starting control circuit is of a resettable dynamic DFF structure; a phase detection circuit which is used for carrying out phase detection on the two input signals and outputting a narrow pulse width signal with phase information, wherein the two input signals are respectively obtained by a reference signal and a to-be-locked signal through a buffer, the phase detection circuit comprises two resettable dynamic DFFs with double CLKs, the reset ends of all the dynamic DFFs are connected to the RST. According to the phase discriminator circuit, phase discrimination is completed by using the dynamic DFF, and reset is triggered by the input signal, so that a reset path can be shortened, andthe phase detection speed is increased.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a delay phase-locked loop and a phase detector circuit thereof. Background technique [0002] With the rapid development of integrated circuits, delay locked loop (Delay Locked Loop, DLL) has become a more commonly used on-chip clock generation technology, which uses negative feedback mechanism to obtain lower jitter with smaller power consumption and area clock. The phase detector (Phase Detector, PD) is an important part of the DLL. It is responsible for identifying the rising edges of the two input signals, generating two output control signals UP and DN with a certain pulse width, and the difference between the rising edges The value is proportional to the output pulse width. In order to avoid the situation of false locking, a start-up circuit is often added as an auxiliary. [0003] In a DLL, the traditional PD structure with a start-up circuit such as figure...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a delay phase-locked loop and a phase detector circuit thereof, to solve the above-mentioned existing phase detector circuit reset path is long, the technical problem of large overall power consumption

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