High-speed data transmission pre-emphasis circuit for LVDS and control method thereof

Abstract

The invention discloses a high-speed data transmission pre-emphasis circuit for LVDS and a control method thereof. Two pre-emphasis current source circuits, two high-gain broadband operational amplifiers and four pre-emphasis state change-over switches are adopted to form a basic circuit architecture; four pre-emphasis state change-over switches and a high-gain broadband operational amplifier areadded on the basis of a classic bridge type switch current source topological structure to achieve amplitude enhancement of high-frequency components in the high-speed data signal transmission processso as to compensate attenuation of signal amplitude information in the high-speed signal transmission process. According to the invention, negative feedback adjustment speed and precision of common-mode voltage can be obviously improved during high-speed data transmission; the problem of common-mode signal deterioration during high-speed data transmission can be solved through the double-high-gain and broadband operational amplifier design, the problem of poor waveform consistency of differential signals can be effectively improved, and the purposes of improving the overall signal integrity of the LVDS transmitter circuit and reducing the bit error rate are achieved.

Description

technical field [0001] The invention belongs to the field of circuit design, and relates to a high-speed data transmission pre-emphasis circuit for LVDS and a control method thereof. Background technique [0002] As a high-speed serial data communication interface, the low-voltage differential signaling (LVDS) transmitter has been widely used in high-speed backplanes, processors and other high-speed applications, and is an important high-speed serial data interface. Generally, the commonly used LVDS transmitter interface is suitable for occasions where the communication rate is lower than 500Mbps, but for medium and high-speed transmission, the common LVDS transmitter can no longer meet the standard design requirements, especially for large capacitive load conditions above GHz, the common The design structure of the LVDS transmitter will cause problems such as poor signal quality and large common-mode signal drift, which will cause a sharp increase in the bit error rate of s...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of high-speed data transmission pre-emphasis circuit for LVDS for the problem that the structure of the LVDS transmitter in the above-mentioned prior art cannot meet the requirements of high-speed data communication The invention and its control method can realize amplitude enhancement of high-frequency components in the process of high-speed data signal transmission, so as to compensate for the attenuation of signal amplitude information in the process of high-speed signal transmission

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