Patent ID: 6573600
Filing Date: 2003-06-03
Classification: H01L,H05K

Abstract:
A multilayer wiring substrate comprising:differential signal wires placed within a first insulating layer between a first power-supply plane and a first ground plane, said differential signal wires configured to achieve a predetermined differential impedance; and general signal wires placed within a second insulating layer between a second power-supply plane and a second ground plane, said general signal wires configured to achieve a predetermined characteristic impedance, wherein said differential signal wires are placed in a different plane from a plane having each of said general signal wires so that said different plane includes a first area having said differential signal wires, and a second area having one of said second power-supply plane and said second ground plane; and said general signal wires are placed in a vertical direction of said second area in a laminated state so that each of said general signal wires is placed between said second power-supply plane and said second ground plane.