| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce wiring of a transmission line is performed for protecting the flight time of transmission signal when connecting elements on a signal transmission circuit board, and to reduce spurious radiation which follows it. SOLUTION: At connection of a CPU 101 to a CPU controller 102 on a substrate, transmission lines 103 and 104, in which corresponding terminals are away from each other, are connected on a near small substrate surface of low dielectric constant while a transmission line 105 in which corresponding terminals are near each other is connected in a near intermediate interconnection layer of high dielectric constant. The intermediate layer and the substrate surface are penetrated with a conductive inter-layer connection hole 106.</p> |
