Design method for reducing crosstalk influence between high-speed differential pairs

Abstract

The invention discloses a design method for reducing crosstalk influence between high-speed differential pairs. Polarity of the parts, in front and rear of DC (direct current) coupling capacitors, of differential pair lines is reversed; crosstalk positive and negative amplitude noises of far ends are mutually stacked; differential overall noise is weakened. Theoretical analysis and simulation verification show that the design method has the effect of improving crosstalk quality of high-speed signals on high-density layout PCBs (printed circuit boards); by the use of the design method, development cost of products can be lowered, product quality is stable, and the products are more competitive in the market.

Description

technical field [0001] The invention relates to the field of PCB design, in particular to a design method for reducing the influence of crosstalk between high-speed differential pairs. Background technique [0002] At present, the PCB design of server products is tending to develop in the direction of high signal rate and high wiring density. Such a design method can improve product performance and reduce product production costs, thereby enhancing the competitiveness of products in the market. Then, it also increases the difficulty of design. For example, in order to reduce product cost, the number of stacked design layers can be reduced, which greatly increases the difficulty of high-speed wiring, and the reduction of space between differential pairs will increase the difference between differential pairs. Inter-coupling, resulting in an increase in crosstalk strength. At the same time, due to the increase of signal speed, it means that the signal rise time is shortened,...

AI Technical Summary

Problems solved by technology

Therefore, the improvement of signal speed and the increase of layout high-speed wiring density will make the influence of crosstalk effect between signals more significant, thus affecting the stability of product quality

[0003] Due to the parasitic inductance and capacitance effect on the signal propagation path when laying out the PCB main board, when the signal propagates on a PCB Trace path, it will inevitably propagate to other adjacent ones through the coupled parasitic inductance and capacitance. Trace, and generate voltage noise on the near end and far end of its Victim Trace, thereby introducing crosstalk

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