Duo-binary PAM4 transmitter and data transmission system

Abstract

In order to solve the problems that attenuation is too large and power consumption is too high when a traditional NRZ transmitter and a traditional PAM4 transmitter pass through a strong channel, the Duo-binary PAM4 transmitter and the data transmission system are provided, and the Duo-binary PAM4 transmitter comprises a pseudo PRBS generator, a precoding module, a dual binary module, a low-speed parallel-serial conversion module, a 4: 1 high-speed combiner and a voltage mode driving circuit. The 4: 1 high-speed combiner comprises four independent data signal current compensation circuits, and the output ends of the four data signal current compensation circuits superpose four paths of signals through wires so as to realize a combining function and output a signal Y; and the data transmission system comprises a receiver and the Duo-binary PAM4 transmitter mentioned above. According to the invention, Duo-Binary PAM4 coding is adopted to solve the problem of overlarge signal attenuation, and a 4: 1 high-speed combiner of a current compensation architecture is utilized, so the power consumption is reduced, the time sequence margin is improved, and the judgment tolerance is widened.

Description

technical field [0001] The invention relates to the interconnection of chips and optical modules, the interconnection of chips and wired communication technology in the field of Ethernet interconnection, in particular to a Duo-binary PAM4 transmitter and a data transmission system. Background technique [0002] The Duo-binary PAM4 transmitter is the data sending end of the high-speed serial port, which is used to serialize the multi-channel parallel data sent by the processor, memory or sensor, and transmit it to the receiver through the channel. Such as figure 1 As shown, the existing Duo-binaryPAM4 transmitter mainly includes a pseudo-PRBS generator, a precoding module, a duo-binary module, a low-speed parallel-to-serial conversion module, a 4:1 high-speed combiner and a voltage-mode drive circuit, and its workflow includes: ( 1) Use a pseudo-random code generator to generate 64 channels of 875Mb / s parallel signals; (2) Use a pre-coding module to eliminate the correlation...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: In order to solve the problem of excessive attenuation and high power consumption of traditional NRZ and PAM4 transmitters under strong channels, a Duo-binary PAM4 transmitter and data transmission system are provided. The present invention adopts Duo- Binary PAM4 coding solves the problem of excessive signal attenuation, and uses the 4:1 high-speed combiner with current compensation architecture to reduce power consumption, improve timing margin, and widen decision tolerance

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