Patent ID: 7814445

Claim:
An interference analysis device for analyzing interference between wires provided on a circuit board and including a coupled line, comprising: an input unit that inputs design data representing an arrangement of the wires on the circuit board; a selection unit that selects an analysis region that includes at least a part of the circuit board represented by the design data; a division unit that divides the wires in the analysis region into segments to be units for calculating a circuit matrix; a calculation unit that calculates a circuit matrix with respect to a coupled line constituted by a single segment or a plurality of segments adjacent to each other among the segments divided by the division unit; and an analysis unit that obtains a degree of electromagnetic interference between the wires in the analysis region based on the circuit matrix, wherein the calculation unit calculates the circuit matrix of the coupled line, using a parameter set obtained by adding an asymmetry parameter P representing asymmetry of the coupled line to RLGC parameters containing a resistance (R), an inductance (L), a parallel conductance (G), and a capacitance (C) per unit length of a transmission line representing the coupled line.