Subtractive etch factor variations along trace runs create localized impedance drift and coherent reflection peaks that severely degrade high frequency return loss.
Mitigate differential stripline glass weave skew by combining low-Dk spread glass, multi-ply prepregs, and minimum two-degree routing offsets on drawings.
Temperature-driven phase delay drift in PAM4 stackups stems from the thermal expansion coefficient mismatch between glass fibers and resin matrix.
Selecting mechanically spread glass fabric and enforcing multi-ply laminate construction mitigates intra-pair differential skew without panel rotation costs.
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