Phase detector

Abstract

A phase detector is used to detect the phase difference between a data signal and a clock signal, and to export a first rising signal whose pulse width is between 1 / 2 times to 3 / 2 times of clock signal cycle, a first down signal having the same cycle as the clock signal, a second down signal and a second rising signal to a charging pump.

Description

technical field [0001] The present invention relates to a phase detector (Phase Detector), in particular to a phase detector used in a phase-locked loop clock recovery system (Phase-locked Loop Clock Recovery System). Background technique [0002] For general synchronous transmission of digital signals, data signals are transmitted from a transmitting unit to a receiving unit at a fixed rate. Usually, the receiver uses a phase-locked loop clock recovery system to detect the phase difference between the received data signal and the clock signal of the receiver, and adjust the phase and frequency of the clock signal of the receiver. In this way, the clock signal at the receiving end will have the same phase and the same frequency as the received data signal, which is beneficial for the receiving end to sample and demodulate the data signal. [0003] Please refer to figure 1 , figure 1 A block diagram of a conventional phase locked loop clock recovery system is shown. The c...

AI Technical Summary

Problems solved by technology

[0012] In view of this, the purpose of the present invention is to provide a phase detector, which can effectively solve the problem that the traditional phase detector causes the phase error signal to diverge so that the phase-locked loop clock recovery system cannot be locked

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