Simulation method and simulation apparatus

A computer-readable recording medium having stored therein a simulation program for causing a computer to execute a simulation process comprising:

• calculating, by performing a three-dimensional electromagnetic field analysis for each of a plurality of first positional patterns of a first wiring board internal structure model for a basic line length including one first glass cloth at the upper side of a pair of first differential lines, the plurality of first positional patterns having different relative positional relationships between the first differential lines and the first glass cloth, a first skew generated between the pair of first differential lines in each of the plurality of first positional patterns, and calculating, by performing a three-dimensional electromagnetic field analysis for each of a plurality of second positional patterns of a second wiring board internal structure model for a basic line length including one second glass cloth at the lower side of a pair of second differential lines, the plurality of second positional patterns having different relative positional relationships between the second differential lines and the second glass cloth, a second skew generated between the pair of second differential lines in each of the plurality of second positional patterns;
• and
• calculating, for each of a plurality of wiring board patterns configured by combining a plurality of first combination patterns individually configured by combining the plurality of first positional patterns of the first wiring board internal structure model for a certain line length and a plurality of second combination patterns individually configured by combining the plurality of second positional patterns of the second wiring board internal structure model for a certain line length, a total skew by summing the first skew of each of the plurality of first positional patterns configuring each of the plurality of first combination patterns and summing the second skew of each of the plurality of second positional patterns configuring each of the plurality of second combination patterns, and then acquiring a skew distribution in a wiring board having a certain line length based on the calculated total skews.

A simulation apparatus, comprising:

• a processor;
• wherein the processor configured to execute a process including:
• calculating, by performing a three-dimensional electromagnetic field analysis for each of a plurality of first positional patterns of a first wiring board internal structure model for a basic line length including one first glass cloth at the upper side of a pair of first differential lines, the plurality of first positional patterns having different relative positional relationships between the first differential lines and the first glass cloth, a first skew generated between the pair of first differential lines in each of the plurality of first positional patterns, and calculates, by performing a three-dimensional electromagnetic field analysis for each of a plurality of second positional patterns of a second wiring board internal structure model for a basic line length including one second glass cloth at the lower side of a pair of second differential lines, the plurality of second positional patterns having different relative positional relationships between the second differential lines and the second glass cloth, a second skew generated between the pair of second differential lines in each of the plurality of second positional patterns;
• and
• calculating, for each of a plurality of wiring board patterns configured by combining a plurality of first combination patterns individually configured by combining the plurality of first positional patterns of the first wiring board internal structure model for a certain line length and a plurality of second combination patterns individually configured by combining the plurality of second positional patterns of the second wiring board internal structure model for a certain line length, a total skew by summing the first skew of each of the plurality of first positional patterns configuring each of the plurality of first combination patterns and summing the second skew of each of the plurality of second positional patterns configuring each of the plurality of second combination patterns, and then acquires a skew distribution in a wiring board having a certain line length based on the calculated total skews.