| 摘要 |
PROBLEM TO BE SOLVED: To reduce the crosstalk noise by alternating signal lines and ground wirings and laminating conductor layers so as to alternately arrange the signal lines and ground wirings in the conductor laminating direction. SOLUTION: A conductor layer 12 having ground wirings 12a and signal wirings 12b is formed between interlayer insulation layers 11a, 11b. Ground wirings 12a are always formed at both sides of the signal line 12b so as to alternately arrange the wirings 12a and signal lines 12b. Conductor layers 13 adjacent to the upper and lower conductor layers 12 and ground wirings 13a and signal wiring 13b are also alternately arranged but the signal wirings 12b of the conductor layers 12 and those 13b of the conductor layers 13 are mutually offset in one direction perpendicular to their laminating direction so that one signal line is surrounded with the ground wirings in vertical and horizontal directions. The signal wiring 12b is surrounded with the ground wirings 12a at the right and left and with those 13a at the upper and lower sides to thereby electrically shield it, thus reducing the crosstalk noise. |
