Printed substrate design system, and printed substrate design method

A printed substrate design system for designing a substrate configuration of a printed substrate so as to suppress common mode radiation occurring from a cable connected to the printed substrate, an IC and a passive component being mounted on the printed substrate, the printed substrate design system comprising:

• an input unit that receives input of printed substrate design information;
• an EMI characteristic derivation unit that derives an EMI characteristic from the input printed substrate design information received by the input unit, the EMI characteristic being a characteristic of common mode radiation occurring from the cable connected to the printed substrate;
• a determination criteria storage unit that stores an EMI allowable condition being a condition of an allowable EMI characteristic of the printed substrate;
• an EMI condition determination unit that compares the EMI characteristic derived by the EMI characteristic derivation unit with the EMI allowable condition stored in the determination criteria storage unit, the EMI condition determination unit determining whether the EMI characteristic of the printed substrate satisfies the EMI allowable condition;
• a substrate configuration change unit that changes an internal configuration of the printed substrate to obtain a changed configuration of the printed substrate in a case where the EMI condition determination unit has determined that the EMI allowable condition is not satisfied, the substrate configuration change unit setting design information of the changed configuration of the printed substrate to design information for deriving the EMI characteristic in the EMI characteristic derivation unit;
• and
• an output unit that outputs a printed substrate configuration that satisfies the EMI allowable condition in a case where the EMI condition determination unit has determined the EMI allowable condition is satisfied.