Keywords and Phrases
Fiber weave effect; Glass weave effect; Skew
"As the data rates increase into the multi-gigabit range, the bit periods fall in the range of few tens of picoseconds. At above few Gbps, it becomes very important to reduce skew between differential pairs as it can adversely impact the signal eye and thereby increase bit error rate. The goal of this study is to mitigate the skew contributed by woven glass fabric of PCB dielectrics.
The glass weave skew between differential pairs in a PCB occurs due to the difference in dielectric constants (DK) of glass and resin. This thesis aims to mitigate the skew by reducing the effective DK difference experienced by the traces of a differential pair. Several strategies like using low DK glass, spread glass styles with less gaps in the glass fabric, 1-ply and 2-ply dielectrics, routing the traces in warp and fill directions are studied through measurements taken on several test vehicles.
Since the relative location of traces with respect to glass bundles cannot be controlled, it is highly unlikely to capture the worst case skew from measurements on few test vehicles. Full wave simulation model of laminate with fiber weave is employed. A systematic approach using measurements and simulations to mitigate the differential pair skew is presented"--Abstract, page iii.
Fan, Jun, 1971-
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri University of Science and Technology
xi, 51 pages
© 2016 Kartheek Nalla, All rights reserved.
Thesis - Open Access
Electronic OCLC #
Nalla, Kartheek, "Mitigation of glass weave skew using a combination of low DK spread glass, multi-ply dielectric and routing direction" (2016). Masters Theses. 7859.