| 摘要 |
PROBLEM TO BE SOLVED: To provide a CAD system appropriate for designing an electronic circuit board including a differential wiring, a computer program for realizing the function of the CAD system on a computer and a manufacturing method of the electronic circuit board based on CAD data designed by the CAD system for the electronic circuit board. SOLUTION: Wirings LN1, LN2 structuring the differential wiring have respective wiring nets which are different from each other. The wiring nets are registered on net groups in advance. Only a set of wiring nets belongs to a net group. The wiring LN1, LN2 simultaneously generated by inputting a widthwise middle point of them on a drawing layer. For the wiring LN1, LN2, when coming as close as a predetermined distance to a pad, lead-in process to the pad or drawing support process is executed. COPYRIGHT: (C)2006,JPO&NCIPI
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