Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Reexamination Certificate
2002-05-14
2008-10-14
Norris, Jeremy C (Department: 2841)
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
C361S761000
Reexamination Certificate
active
07435912
ABSTRACT:
A circuit board includes multiple signal layers, in which signal lines are routed, and reference plane layers, in which power reference planes are provided. To connect signal lines at different signal layers, vias are passed through at least one signal layer and at least one reference plane layer. At the one signal layer, a first clearance (or anti-pad) is defined around the via. At the reference plane layer, a second clearance is defined around the via. The second clearance is larger in size than the first clearance to match the impedance of the via as closely as possible with the impedance of a signal line the via is electrically connected to.
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Alexander Arthur R.
Fan Jun
Knighten James L.
Norris Jeremy C
Stover James
Teradata , US Inc.
Trop Pruner & Hu P.C.
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