| 摘要 |
<p>PROBLEM TO BE SOLVED: To decrease a loop area formed of high frequency power supply current without mounting a part such as a capacitor for restraining radiation noise. SOLUTION: A multilayer substrate 1 is provided with a via 8 and a decoupling capacitor is practically formed of an extension part 7a of a power supply wiring 7 formed in an inner wall of the via 8 and a conductor 11 plugging a central hole 9 of the via 8 and is connected to a ground wiring 5. As a result, it is possible to decrease an area of a current loop and to restrain radiation noise effectively.</p> |
