DC25_SLIDES_Track13_ReducedOrderGeometricMacroModel_McMorrow.pdf

1、Information Classification:GeneralWelcome to ConferenceJanuary 2830,2025Santa Clara Convention Center1ExpoJanuary 2930,2025 Information Classification:GeneralReduced Order Geometric Macro Model of PCB Fiberglass Spatial Variation for Skew and Impedance PredictionScott McMorrow,Samtec IncSandeep Sank

2、araraman,Samtec Inc2Information Classification:GeneralImageSPEAKERSScott McMorrowStrategic Technologist,SamtecScott.McM|SScott McMorrow serves as a Strategic Technologist for Samtec,Inc.As a consultant for years too numerous to mention,Scott has helped many companies develop high performance product

3、s,while training signal integrity engineers.Today he works for the man,where he continues being a problem solver,a change agent and betting his job every day.3Information Classification:GeneralFiber Weave4 Fiber bundles in spread weave are spread using a mechanical fluid process.When pulled off the

4、roll in the Warp direction tension necessary to keep the process stable cause the bundles to compress and narrow.Fill fibers maintain their spread nature.Thus,even in a perfectly square weave there is an asymmetry between the two directions.Information Classification:GeneralRectangular Modeling of F

5、iber Regions5 To model fiberglass we need to model this asymmetry.There are four distinct regions within a fiberglass square.Fill and Warp OverlapFill onlyWarp onlyResin onlyInformation Classification:GeneralRectangular Modeling Expanded(15 mil Pitch)6 Example of 1035 fiberglass expanded into the fo

6、ur distinct regions with a differential trace routed between core and prepreg.This method averages the material properties across the regions using calculations roughly based on Bert Siminovichs methods 1.Calculations for the bulk averages are modified for regional volume fraction differences for ea