Nec Corporation

Akira Wakui

Takashi Harada

Takahiro Yaguchi

Seishi Eya

Hideki Sasaki

Toshihide Kuriyama

Shunsuke Fujimoto

A printed circuit wiring board designing support device includes a layout data receiving section receiving printed circuit board layout data through an input/output section, a section for extracting structures of power supply/ground planes, a via hole extracting section for extracting a via hole interconnecting the wirings extending over power supply/ground planes, a capacitor extracting section for extracting a capacitor connected between power supply/ground planes, a distance measuring section for measuring the distance between the via hole and the capacitor, a database where the allowable distance value between the via hole and the capacitor in respect to the distance between the power supply and ground planes is recorded, an examination section for comparing the capacitor/via hole distance with the allowable distance value, and a warning section for issuing a warning when the distance between the via hole and the capacitor is larger than the allowable distance value.

Printed circuit wiring board designing support device, printed circuit board designing method, and its program

In a printed circuit board design support apparatus for supporting design of a printed circuit board by calculating a radiation amount of electromagnetic radiation caused by an interconnection on the basis of design information related to each of the printed circuit board having a ground plane, interconnections formed on the printed circuit board, and components to be mounted on the printed circuit board, an arithmetic unit calculates a common mode (CM) radiation amount of the interconnection on the basis of a CM radiation amount ratio that indicates a ratio of a common mode (CM) radiation amount of electromagnetic radiation caused by the ground plane in correspondence with the interconnection to a differential mode (DM) radiation amount of electromagnetic radiation caused by the interconnection. A printed circuit board design support method and program are also disclosed.

Printed circuit board design support apparatus, method, and program

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Tokyo, Japan

Akira Wakui