Optimum rotation angle for mitigating differential skew induced by glass cloth in PCBs

Wang, C.; Iokibe, Kengo; Toyota, Yoshitaka

doi:10.23919/icep.2018.8374316

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is known a problem with the differential skew, such as the differential skew occurring in the differential transmission lines on a printed circuit board because of dielectric problems with the board's glass cloth [20,21,22,23]. It has been reported that the differential skew becomes a relatively small value when the angle between the trace of the differential transmission lines and the thread of the glass cloth is around 40 • [24]. Therefore, this study focuses on the an-gle between the trace of the differential transmission lines and the meshed ground plane and investigates the angle dependence of the differential skew, taking into account phase delay between two lines with propagation to find low differential skew at the angle other than 45 • .…”

Section: Introductionmentioning

confidence: 99%

Mitigating differential skew by rotating meshed ground for high-density layout in flexible printed circuits

Wang

Iokibe

Toyota

2020

IEICE Electron. Express

View full text Add to dashboard Cite

Asymmetry of differential transmission lines over a meshed ground plane causes differential skew, which leads to signal integrity issues. We measured to evaluate how the angle between the differential transmission lines and meshed ground (the rotation angle) affected differential skew. We also investigated the effect of the lines' position on characteristic impedance and the feasibility of high-density layout of the differential transmission lines, including the bend structure. We found that the differential skew and characteristic impedance are not significantly affected by the position of the differential transmission lines and meshed ground when the rotation angle is set to 30 • , a relatively small value. Measurements showed that our design is effective.

show abstract