Phase detection and starting circuit used in multiphase clock generating circuit of high-speed serial interface

Abstract

A phase detection and starting circuit used in a multiphase clock generating circuit of a high-speed serial interface comprises a phase detector and a starting circuit, wherein the phase detector is provided with three input ends and two output ends, the starting circuit is connected with the input end of the phase detector, and the starting circuit comprises an AND gate, a first D trigger, a second D trigger, a third D trigger, a first CML2CMOS circuit, a second CML2CMOS circuit, a third CML2CMOS circuit, a first buffer, a second buffer and a third buffer. The circuit controls initial states of clock signals entering the phase detector when the multiphase clock generating circuit starts working, so that the wrong locking and the harmonic locking of the multiphase clock generating circuit can be effectively prevented, the phase detector adopts the current mode logic technology, the working efficiency is high, and the incoming mismatching jittering is low.

Description

technical field [0001] The invention relates to a multi-phase clock generation circuit realizing clock recovery function in a high-speed serial interface adopting a forward clock structure, especially a phase detection and start-up circuit adopted in the multi-phase clock generation circuit. Background technique [0002] In the high-speed serial interface using the forward clock, the transmitting end and the receiving end are composed of a clock channel and multiple data channels. The transmitting end sends a differential clock signal to the receiving end through the clock channel; the transmitting end sends a differential data signal to the receiving end through the data channel. The receiving end receives the differential clock signal transmitted from the clock channel, and recovers the clock signal through the clock generation circuit; the receiving end receives the differential data signal transmitted from the data channel, and recovers the data signal through the data r...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of phase detection and start-up circuit suitable for use in the multi-phase clock generation circuit of the high-speed serial interface of the forward clock. The start-up circuit is used to solve the problem of wrong locking of the multi-phase clock generation circuit. The device is used to solve the problems of the existing multi-phase clock generation circuit such as high difficulty in phase detector design, large jitter and low phase detection accuracy.

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