| 摘要 |
<p>PURPOSE:To reduce a crosstalk caused by crossed interconnections by a method wherein an insulating layer is formed to be thicker than other signal-layer pairs and a signal-layer pair in which a signal line having a comparatively long section length has been wired is installed at a signal-line layer. CONSTITUTION:The distance (a) between a signal layer 2 and a signal layer 3 in a signal-layer pair 8 is set to be longer than the distance (b) between a signal layer 4 and a signal layer 5 in a signal-layer pair 9. A signal line having a comparatively long section length is wired in a signal-line layer of the signal- layer pair 8. By this constitution, the signal line which has been wired in the signal-layer pair 8 is hardly influenced by an interlayer crosstalk as compared with a signal line which has been wired in the signal-layer pair 9. When a wiring operation is executed to the signal-layer pair 8 hardly influenced by a crosstalk by crossed interconnections preferentially from a long interconnection, it is possible to design an interconnection which is hardly influenced by the crosstalk by the crossed interconnections as a whole substrate.</p> |
