| 摘要 |
PROBLEM TO BE SOLVED: To reduce radiation from a cable which is being the primary radiation source of a radiation noise in a configuration where a signal is transmitted through a cable between a signal transmission side printed wiring board and a signal reception side printed wiring board on a conductive equipment case body (ground). SOLUTION: A driver IC 13 and a receiver IC 14 constituted of a digital clock circuit are loaded, and a driver printed wiring board 11 and a receiver printed wring board 12 having a ground conductor are connected through a cable 15, including signal wiring and ground writing for signal transmission on a conductive equipment case body 20. In this case, one arbitrary point on the ground conductor of the receiver printed wiring board 12 and the conductive equipment casing body 20 are grounded by an impedance element 16, having a circuit constant equal to impedance characteristics between the ground wiring of the cable 15 and the conductive equipment case body 20. |
