Phase discriminator and phase-locked loop circuit

Abstract

The invention belongs to the field of the phase locking technology, and provides a phase discriminator and a phase-locked loop circuit. The phase discriminator includes a phase difference output circuit, a delay output circuit and a precharged discharge signal output circuit; the first input end and the second input end of the phase difference output circuit are connected with a frequency divisionclock signal and an input clock signal respectively so as to compare the phases of the frequency division clock signal and the input clock signal and output a phase difference signal; the delay output circuit is used for delayed output processing of the frequency division clock signal and outputting of a delayed signal; the input end of a precharged discharge signal is connected with the input clock signal and connected with the output end of the delayed output circuit, and the input end of the precharged discharge signal is connected with the input clock signal so as to output the prechargeddischarge signal. The circuit calibration accuracy is high, the locking time is shortened, and the demand of a modern communication system for phase-locked loop frequency fast switching is met.

Description

technical field [0001] The invention belongs to the technical field of phase lock, and in particular relates to a phase detector and a phase locked loop circuit. Background technique [0002] In order to improve spectrum utilization efficiency, most modern wireless communication systems adopt frequency division multiplexing technology. The channel used by wireless transceivers for wireless communication will be switched in real time according to the real-time occupancy of the channel and channel quality. The real-time switching of the channel is realized by changing the output frequency of the phase-locked loop. The phase-locked loop provides a frequency-programmable local carrier signal for the up- and down-conversion circuits in the transceiver. It is a core key module in the wireless transceiver, and its performance will greatly affect the communication quality of the communication system. [0003] Such as figure 1 As shown, the basic modules of a traditional phase-lock...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a phase detector and a phase-locked loop circuit, aiming to solve the problems of low calibration accuracy and low work efficiency in the traditional technical solutions

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