Clock recovery circuit and receiving chip

Abstract

The invention discloses a clock recovery circuit and a receiving chip. A first phase shifter performs phase shifting on a reference sampling clock so as to output n data sampling clocks and n phase sampling clocks; a sampling circuit samples data signals to output n data sampling signals and n phase sampling signals; a phase discriminator compares the n data sampling signals with the n phase sampling signals, and generates n decision signals according to comparison results; a charge pump integrates the n decision signals to output an adjustment level; a counting circuit is used for counting according to the adjusting level and converting a counting result into a selection signal and an interpolation control signal; an interpolation circuit selects two reference clocks from the n data sampling clocks and the n phase sampling clocks according to the selection signal, and performs phase interpolation on the two reference clocks according to the interpolation control signal to obtain an updated reference sampling clock so as to trigger the first phase shifter to work; therefore, the design difficulty is reduced, and the risk of circuit lock loss is avoided.

Description

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

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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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