Patent ID: 7671281

Claim:
An organic multilayer wiring circuit board comprising: a signal layer; a first insulating resin layer arranged on the signal layer; a lamination body arranged on the first insulating resin layer, the lamination body includes: an electric power layer, a ground layer; and a second insulating polyimide layer provided between the electric power layer and the ground layer, the second insulating polyimide layer having a thickness of 4 to 25 μm, the second insulating polyimide layer having a thermoplastic adhesive property on both faces; a third insulating resin layer arranged on the lamination body, the third insulating resin layer having a thickness of 80 micron or less; and an uppermost conductive layer arranged on the third insulating resin layer, on which electronic parts are mounted; wherein the electronic parts mounted on said uppermost conductive layer comprise at least one device which operate at a switching frequency greater than 100 MHz.