Pre-emphasis circuit with configurable emphasis intensity

Abstract

The invention discloses a pre-emphasis circuit with configurable emphasis intensity for high-speed I / O interfaces. The pre-emphasis circuit comprises a regulation circuit and an emphasis circuit, wherein the core of the regulation circuit is a delay unit variable in time delay, and the emphasis circuit comprises a fast charge-discharge unit and a four-pipe logic inverter. The regulation circuit receives a full-width random data signal and a feedback low-swing-amplitude output data signal, and generates two paths of pulse control signals adjustable in pulse width according to different input selection signals. When different inputs jump, the emphasis circuit determines the time to fast charge or discharge an output node according to the pulse width of the two paths of control signals generated by the regulation circuit so as to realize pre-emphasis effects different in intensity, and simultaneously limits output swing amplitude through self-feedback so as to realize output signals highin speed and low in swing amplitude. The pre-emphasis circuit has the advantages of simple structure, configurable pre-emphasis intensity and capability of being used for single-end or double-end high-speed I / O interfaces.

Description

Technical field [0001] The present invention mainly relates to the design field of transmitters in high-speed I / O interfaces, and specifically refers to a pre-emphasis circuit with configurable weighting strength. Background technique [0002] In the high-speed I / O interface, especially the serial data interface such as USB, SATA, PCIE, because the data transmission rate is very high, the inter-code interference generated during the data transmission process is very serious. Therefore, in the design process of the transmitter circuit, it is usually necessary to pre-emphasize the high-frequency components of the signal to reduce the bit error rate of the received data due to the high-frequency attenuation during transmission. The traditional high-speed pre-emphasis circuit has a complicated structure. The power consumption is large, and the aggravation intensity remains the same, and cannot be changed with the transmission medium. Therefore, either the aggravation strength is not ...

AI Technical Summary

Problems solved by technology

Therefore, in the design process of the transmitter circuit, it is usually necessary to pre-emphasize the high-frequency components of the signal to reduce the bit error rate of the received data due to high-frequency attenuation during transmission. However, the traditional high-speed pre-emphasis circuit has a complex structure. The power consumption is very large, and the emphasis intensity is constant and cannot be changed with different transmission media. Therefore, either the emphasis intensity is not enough, or the emphasis intensity is too large and the power consumption is wasted, which brings severe challenges to the design of the pre-emphasis circuit

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