| 摘要 |
PROBLEM TO BE SOLVED: To design a printed board, suppressing high-frequency power supply current by optimizing quantity of decoupling capacitors mounted in the vicinities of power supply terminals of LSIs for each LSI, reducing mounting space, reducing the material cost and reducing stable operations and EMI. SOLUTION: Electronic equipment designed by a function design 1 is divided into an LSI and an electronic circuit. The LSI is designed by an LSI design 2 and the electronic circuit is designed by a circuit design 4. The electronic circuit designed by the circuit design 4 is pattern-designed by a wiring pattern design 5 of a printed board design 7. The necessary number of decoupling capacitors for every output buffer classification is determined from an output buffer coefficient table in the determination 3 of quantity of decoupling capacitors, based on the classification of the output buffer and the number of output terminals of the LSI completed in design by the LSI design 2. The determined necessary number is notified to a decoupling capacitor mounting 6 of the printed board design 7, and the printed board mounted with decoupling capacitors of the necessary number is designed.
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