Patent ID: 6747356
Filing Date: 2004-06-08
Classification: H01L,H05K

Abstract:
A semiconductor device comprising:a multilayer circuit board having an insulating base member, a first wiring layer arranged on a surface of said base member and provided with a power plane for supplying electric power, a third wiring layer arranged on said first wiring layer via an insulating layer and provided with a power plane for supplying electric power, and a second wiring layer arranged between said first and third wiring layers and provided with a first signal wiring for transmitting a signal; and a semiconductor chip arranged on a main surface of said multilayer circuit board, wherein the gap between said first and second wiring layers is larger than that between said second and third wiring layers, and an area of said power plane of said third wiring layer is larger than that of said power plane of said first wiring layer.