Circuit board through-hole impedance tuning using clearance size variations
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United States of America Patent
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Nov 10, 2009
Grant Date -
Mar 27, 2008
app pub date -
Oct 30, 2007
filing date -
Feb 5, 2002
priority date (Note) -
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Abstract
A circuit board comprises signaling through-holes that pass through a plurality of layers, including signal trace and digital ground plane layers, and power reference plane layers. Clearances are set to achieve a desired impedance characteristic for the through-holes. At a power reference plane layer, the clearance is defined around multiple neighboring through-holes.
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