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Method for checking return path of printed board and cad apparatus for designing patterns of printed board
Method for checking return path of printed board and cad apparatus for designing patterns of printed board
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机译：检查印制板返回路径的方法和设计印制板图案的cad设备
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摘要
A CAD apparatus for designing patterns of a printed board, includes: a signal wiring pattern detecting unit 22 for detecting a signal wiring pattern with reference to wiring information of the printed board; a guard ground detecting unit 23 for tracing the signal wiring pattern along the longitudinal direction thereof, to detect whether or not a guard ground exists within a distance from the signal wiring pattern to a predetermined first discriminant value GL, and for identifying a non-guard ground section in which no guard ground exists within the distance to the first discriminant value GL, and for detecting whether or not a guard ground exists within another distance from the signal wiring pattern to a second discriminant value GU, which is larger than the first discriminant value GL, in the non-guard ground section; and a return path judging unit 25 for judging an error of guard ground when no guard ground exists within the distance to the second discriminant value GU in the non-guard ground section, thereby quickly checking a return path without mistake.
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