Patent ID: 8271925
Filing Date: 2012-09-18
Classification: G06F,H05K

Abstract:
1. A printed board design system comprising: hardware; a decoupling capacitor pin position information obtain unit implemented at least by the hardware and which calculates decoupling capacitor pin position information based on board design data of a printed board, wherein said decoupling capacitor pin position information indicates positions of a plurality of decoupling capacitors to be mounted on said printed board; a power supply plan position/shape information obtain unit implemented at least by the hardware and which calculates power supply plane position/shape information based on said board design data, wherein said power supply plane position/shape information indicates a position of a power supply plane of said printed board and a shape of said power supply plane; a restriction information input unit implemented at least by the hardware and which collects restriction conditions from an input device, said restriction conditions restricting said positions of said decoupling capacitors to be mounted on said printed board; and a decoupling capacitor examination unit implemented at least by the hardware and which calculates a judgment result based on said decoupling capacitor pin position information, said power supply plane position/shape information and said restriction conditions, wherein said judgment result indicates whether or not an arrangement of said plurality of decoupling capacitors is adequate, wherein said restriction conditions indicate a DCP-DCP (decoupling capacitor pin-decoupling capacitor pin) distance upper limit, said decoupling capacitor examination unit includes: a DCP-DCP distance detecting unit which calculates DCP-DCP distances based on said decoupling capacitor pin position information; a decoupling capacitor position judgment unit which calculates said judgment result based on said decoupling capacitor pin position information, said power supply plane position/shape information and said restriction conditions, each of said DCP-DCP distances indicates electrical distance between power supply pins of two adjacent decoupling capacitors among said plurality of decoupling capacitors, when a maximum value of said DCP-DCP distances is larger than said DCP-DCP distance upper limit, said judgment result indicates that said arrangement of said plurality of decoupling capacitors fails said restriction conditions.