带状垂直差分结构分析与优化

计算机工程与科学 ›› 2025, Vol. 47 ›› Issue (8): 1354-1363.

带状垂直差分结构分析与优化

章幻,李滔,胡晋

(江南计算技术研究所，江苏无锡 214083)

收稿日期:2024-10-08 修回日期:2024-11-01 出版日期:2025-08-25 发布日期:2025-08-27

Analysis and optimization of the strip vertical differential structures

ZHANG Huan,LI Tao,HU Jin

(Jiangnan Institute of Computing Technology，Wuxi 214083，China)

Received:2024-10-08 Revised:2024-11-01 Online:2025-08-25 Published:2025-08-27

摘要/Abstract

摘要： 随着差分信号速率的不断提升，传统差分过孔的不连续性对信号完整性的影响越来越不容忽视。为了解决多层PCB垂直方向上信号反射、衰减和阻抗不连续问题，急需开展新型垂直差分结构的研究。首先采用三维电磁仿真软件HFSS构建了Model I和Model II 2种类型的带状垂直差分结构与传统差分过孔模型；其次对2种带状垂直差分结构的传输性能进行仿真与分析，发现Model I模型传输性能优于Model II模型；再次分析结构参数对带状垂直差分结构Model I模型的电性能传输参数的影响；最后，对比分析了带状垂直差分结构Model I模型与传统差分过孔的电性能传输参数，并通过时域眼图进行了验证。结果表明：减少面连接盘尺寸、垂直导体深度与残桩长度，增大钻孔直径与反焊盘尺寸，可以改善Model I模型的传输性能；Model I模型转换相比传统差分过孔转换带来的眼高和眼宽增大了4.47%和4.31%，抖动减少了57.16%，Model I模型具有更优的时域传输性能。

关键词: 差分信号, 信号完整性, 阻抗不连续, 带状垂直差分结构, 时域眼图

Abstract: With the continuous improvement of differential signal rate,the impact of traditional differential via discontinuity on signal integrity is becoming more and more noticeable.In order to solve the problem of signal reflection,attenuation and impedance discontinuity in the vertical direction of multi-layer PCB,it is urgent to carry out the research on new vertical differential structure.Firstly,the three-dimensional electromagnetic simulation software HFSS is used to construct two types of strip vertical differential structure,Model I and Model II,and the traditional differential via model.Secondly,the transmission performance of the two strip vertical differential structures are simulated and analyzed,and it is found that Model I outperformed Model II in transmission performance.Thirdly,the influence of structural parameters on the electrical performance transmission parameters of the Model I type of strip vertical differential structure is analyzed.Finally,the electrical performance transmission parameters of the Model I type of strip vertical differential structure and the traditional differential via are compared and analyzed,and verified in the timedomain eye diagram.The results show that the transmission performance of the Model I type can be improved by reducing the size of the surface connection pad,the depth of the vertical conductor,and the length of the stub,increasing the diameter of drill hole and the size of anti-pad.Compared with the traditional differential via conversion,the Model I type conversion increases the eye height and eye width by 4.47% and 4.31% respectively,and reduces the jitter by
57.16%,the Model I type has better timedomain transmission performance.

Key words: differential signal, signal integrity, impedance discontinuity, strip vertical differential structure, time domain eye diagram

章幻, 李滔, 胡晋. 带状垂直差分结构分析与优化[J]. 计算机工程与科学, 2025, 47(8): 1354-1363.

ZHANG Huan, LI Tao, HU Jin. Analysis and optimization of the strip vertical differential structures[J]. Computer Engineering & Science, 2025, 47(8): 1354-1363.

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