Patent ID: 7788076

Claim:
An interference analysis device that analyzes interference due to electromagnetic induction between wirings of a circuit board by computer simulation, the interference analysis device comprising: a design data input part for inputting design data of the circuit board, the design data containing data representing a shape of the wirings and properties of an element or a component connected with the wirings; a noise characteristics setting part that sets noise characteristics data representing electrical characteristics of virtual noise input to a terminal of at least one wiring among the wirings of the circuit board, based on data that are contained in the design data and represent properties of an element or a component connected with the terminal; a limit value setting part that sets an allowable limit value of noise received by a terminal of at least one wiring among the wirings of the circuit board, based on data that are contained in the design data and represent properties of an element or a component connected with the terminal; a selection part that, for a group including a terminal for which the noise characteristics data have been set and a terminal for which the noise allowable limit value has been set, compares strength of the virtual noise at a frequency set by the noise characteristics data and the noise allowable limit value at the frequency so as to decide whether calculation of an interference amount is to be performed, and extracts a group of wirings that are connected with a group of the terminals and for which the calculation is to be performed; an interference analysis part that calculates, concerning the group of wirings extracted by the selection part, the interference amount that represents a degree of interference from the terminal to which the virtual noise is input to the terminal that receives the noise; and a received noise level calculation part that calculates, based on the interference amount and the noise characteristics data, a noise level that the terminal that receives the noise will receive, wherein the group of wirings has two or more wirings.