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In order to
allow the flow of electrical information from one side
of the substrate
core to it's other side, PTHs (Plated Through Holes) are
required. As PTHs utilize real estate on the substrate top
surface,
they need to be plugged so that
build-up layers can be built on top. However, in most substrate technologies, these
PTHs are plugged with
dielectric material that can not serve as an electrical ground layer for
the build-up layers
on top. In the AMITEC substrate, on the other hand, all PTHs are capped
with a Copper layer. This helps to
further boost controlled
impedance lines structured within the build-up layers and to
improve the overall reliability of the substrate itself. |
