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US 4,785,141 AGranted
Wiring structure of termination circuit
AssigneeFujitsu Limited
InventorsMikio Nishihara, Kiyoshi Kuwabara
Life of this patent
Estimating the term…
Abstract
A wiring structure for a termination circuit in which a termination circuit is connected to an integrated circuit through a fixed wiring pattern provided in a leadout layer closest to the mounting surface.
Claims1
A wiring structure for a termination circuit in a mutli-layered printed circuit board for mounting integrated circuits having signal terminals and termination circuits electrically connected by circuit wiring patterns formed on internal layers by way of throughholes, said wiring structure comprising:
- a signal layer;
- circuit wiring patterns formed in said signal layer;
- a leadout layer formed on said signal layer;
- leadout patterns formed in a portion of said leadout layer;
- first throughholes extending through said leadout layer and said signal layer;
- first lead patterns formed on said leadout layer and connected to the signal terminals of said integrated circuits;
- first blind throughholes formed in said leadout layer and connecting said leadout patterns and said first lead patterns;
- second lead patterns formed on said leadout layer and connected to said first throughholes;
- second blind throughholes formed in said leadout layer and connecting said leadout patterns and said second lead patterns;
- third lead patterns formed on said leadout layer and connected to terminals of said termination circuit;
- third blind throughholes formed in said leadout layer and connected to said third lead patterns;
- and
- fixed circuit patterns formed in said leadout layer and connecting said first throughholes and said third blind throughholes.
10 more elements
Dependencies are inferred from the claim text.