56 DESIGN007 MAGAZINE I JANUARY 2024
Figure 3: Proportional view expanded showing an isolation distance.
sometimes multiple times in sequential-lami-
nation boards, and the prepregs change state
as the resin heats and flows to a degree in the
curing process. For that reason, a designer
needs more than a raw material datasheet to
understand how the PCB being fabricated will
change in the process. DESIGN007
Martyn Gaudion is managing
director of Polar Instruments
Ltd. To read past columns, click
here. Martyn is the author of
The Printed Circuit Designer's
Guide to… Secrets of High-
Speed PCBs, Parts 1 and 2.
