| 摘要 |
PROBLEM TO BE SOLVED: To predict EMI (Electro-Magnetic Interference) from a pair of a power plane and a ground plane depending on skew of a differential line and to determine the allowance value of the skew of the differential line satisfying an allowed EMI increase amount. SOLUTION: This differential line EMI analysis system is provided with: a printed circuit board equivalent circuit generation part 105 which generates a printed circuit board equivalent circuit model; a circuit calculation part 108 which calculates voltage distribution of the pair of power plane and ground plane and current distribution of the differential line; an EMI increase amount calculation part 109a which calculates the increase amount of the EMI calculated from the printed circuit board equivalent circuit model when there is the skew in the differential line from a reference EMI calculated from the printed circuit board equivalent circuit model when there is no skew in the differential line; and a maximum allowed skew determination part 109a which determines the maximum allowed skew length to be the EMI increase amount less than the allowed EMI increase amount. COPYRIGHT: (C)2009,JPO&INPIT
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