论文标题
评估由于纤维编织效果而导致的PCB互连的延迟不确定性
Evaluation of Delay Uncertainty in PCB Interconnects Due to Fiber Weave Effect
论文作者
论文摘要
提出了延迟偏差超过（DDE）和差异偏差（DSE）措施，以量化由纤维编织效应（FWE）引起的单端和差分PCB互连的延迟不确定性。 DDE和DSE由3D EM分析，对树脂中的玻璃纤维束的不均匀介电的痕迹进行分析。 FWE的测量或3D EM模型通常用于观察延迟或阻抗依赖于轨迹束上的痕迹位置，目的是找到最坏情况。本文将3D EM分析的结果转变为可能的延迟或不确定性偏斜的概率度量 - 单端互连超过允许的极限（DDE度量）的延迟偏差的可能性（DDE度量）或偏差超过了差异互连（DSE度量）。引入的措施允许对并行以及串行PCB互连的层压板选择过程进行形式化。
Delay Deviation Exceedance (DDE) and Differential Skew Exceedance (DSE) measures are proposed to quantify delay uncertainty in single-ended and differential PCB interconnects arising from Fiber Weave Effect (FWE). DDE and DSE are constructed with 3D EM analysis of traces over inhomogeneous dielectric with glass fiber bundles in resin. Measurements or 3D EM models for FWE are usually used for observations of delay or impedance dependency on position of traces over fiber bundles with the purpose to find the worst case scenario. This paper turns the results of 3D EM analysis into probabilistic measures of possible delay or skew uncertainty - probability to have delay deviation in single-ended interconnects over allowed limit (DDE measure) or to have skew over allowed limit in differential interconnects (DSE measure). The introduced measures allow formalizing the laminate selection process for parallel as well as for serial PCB interconnects.
