Patent ID: 6172305
Filing Date: 2001-01-09
Classification: H01L,H05K

Abstract:
A multilayer circuit board comprising:a first insulating layer, on a top of which a first power wiring conductor and a first ground wiring conductor are arranged substantially parallel to each other;a second insulating layer, on a top of which a second power wiring conductor, a second ground wiring conductor and a first signal wiring conductor between the second power wiring conductor and the second ground wiring conductor are arranged substantially parallel to each other;a third insulating layer, on a top of which a third power wiring conductor, a third ground wiring conductor and a second signal wiring conductor between the third power wiring conductor and the third ground wiring conductor are arranged substantially parallel to each other; anda fourth insulating layer, on a top of which a fourth power wiring conductor and a fourth ground wiring conductor arearranged substantially parallel to each other, the first to fourth insulating layers being sequentially overlaid in such a manner that:the first power wiring conductor and the second ground wiring conductor, as well as the first ground wiring conductor and the second power wiring conductor are opposed to each other nearly in parallel via the second insulating layer interposed therebetween;the third power wiring conductor and the fourth ground wiring conductor, as well as the third ground wiring conductor and the fourth power wiring conductor are opposed to each other nearly in parallel via the fourth insulating layer interposed therebetween; andeach wiring on the first insulating layer and the second insulating layer intersects with each wiring on the third insulating layer and the fourth insulating layer at almost right angles,wherein the first to fourth power wiring conductors and the first to fourth ground wiring conductors are connected to each other via through conductors passing through the insulating layers.