Patent ID: 8605448

Claim:
A printed wiring board comprising: a bridge located in a surface layer; a noise absorber located on the bridge; a plurality of grounds directly connected or high-frequency-connected to the bridge; a first device using one of the plurality of grounds as a first reference potential; a second device using one of the plurality of grounds other than the ground for the first device as a second reference potential; and a high-speed signal line that connects the first device and the second device, the high-speed signal line being routed through a layer adjacent to the bridge in a layer direction of the printed wiring board to form a transmission line structure, wherein, when at least one of the plurality of grounds is located in an inner layer of the printed wiring board and has a different potential than a potential of the bridge, the inner layer and the bridge located in the surface layer are high-frequency-connected in series by a via and a capacitor, and wherein, when at least one of the plurality of grounds is located in the surface layer of the print wiring board and has a different potential than the potential of the bridge, the at least one of the plurality of grounds and the bridge located in the surface layer are high-frequency-connected in series by the capacitor.