High-speed differential signal line equal length matching design method

Abstract

The present invention particularly relates to a high-speed differential signal line equal length matching design method. According to the high-speed differential signal line equal length matching design method, for high-speed differential signal lines resulting from layout cabling, a central region in which cabling lengths of the high-speed differential signal lines do not match is determined, and then a phase compensating circuit is connected in the central region in which cabling lengths of the high-speed differential signal lines do not match, so as to enable phases of signals on the high-speed differential signal lines to match, thereby avoiding unnecessary winding. According to the high-speed differential signal line equal length matching design method, the phase compensating circuit is added to the central region in which cabling lengths of the high-speed differential signal lines do not match, so as to implement phase compensation, thereby significantly reducing accumulation of common mode noise caused by a phase error of unnecessary equal length winding, saving cable layout space, greatly decreasing winding time of a designer, improving research and development efficiency, lowering time of product design and development and shortening the research and development period.

Description

technical field [0001] The invention relates to the technical field of research and development of server motherboards, in particular to a design method for equal-length matching of high-speed differential signal lines. Background technique [0002] Differential transmission is a signal transmission technology that uses a numerical value to represent the difference between two physical quantities. In layman's terms, the driving end sends two signals of equal value and opposite phase, and the signal receiving end compares the difference between the two voltages to determine whether the sending end is sending a logic 0 or a logic 1. [0003] Different from the traditional practice of one signal line and one ground line, differential transmission transmits signals on both differential signal lines. The signals on these two differential signal lines have equal amplitudes and opposite phases. The signals transmitted on these two lines are differential signals. The farther the s...

AI Technical Summary

Problems solved by technology

Layout designers often make trade-offs between routing space and equal-length routing, which will consume a lot of time

[0009] Therefore, in order to meet customer needs, there are great challenges for R&D personnel in terms of design quality and R&D cycle

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