Clock recovery circuit and receiver chip

Abstract

A clock recovery circuit and a receiving chip, the reference sampling clock is phase-shifted by a first phase shifter to output n data sampling clocks and n phase sampling clocks; the sampling circuit samples data signals to output n data sampling signals and n phase sampling signals; the phase detector compares the n data sampling signals and n phase sampling signals respectively, and generates n judgment signals according to the comparison results; the charge pump integrates the n judgment signals to output adjustment level; the counting circuit counts according to the adjustment level, and converts the counting result into a selection signal and an interpolation control signal; the interpolation circuit selects two reference clocks from n data sampling clocks and n phase sampling clocks according to the selection signal, and Phase interpolation is performed on the two reference clocks according to the interpolation control signal to obtain an updated reference sampling clock to trigger the operation of the first phase shifter; therefore, the design difficulty is reduced and the risk of circuit loss is avoided.

Description

technical field [0001] The present application belongs to the field of data signal receiving, and in particular relates to a clock recovery circuit and a receiving chip. Background technique [0002] The clock recovery circuit has become an indispensable part of modern integrated circuits because it can recover the received data, perform serial-to-parallel conversion, and eliminate channel interference during transmission. It is widely used in data transceiver systems. With the development of integrated circuit technology and different applications, the parameters and module structure of the clock recovery circuit will also be different, such as: input data rate, input data jitter, input swing, internal clock frequency, bit error rate and power Parameters such as power consumption will be biased due to different applications. Due to the different emphasis on performance parameters, its structure is also different. [0003] The traditional clock recovery circuit mostly adop...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a clock recovery circuit and a receiving chip, which aims to solve the problems of traditional clock recovery circuits causing loss of lock, complicated design, large power consumption and large chip area

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