| 摘要 |
PROBLEM TO BE SOLVED: To inhibit radiation noise from a differential line to improve noise resistance.SOLUTION: A printed circuit board according to the present embodiment comprises a layer for mounting wiring and a component, and a ground layer. The layer for mounting the wiring and the component includes: a differential line composed of a first conductor and a second conductor; first and second components which are placed at positions adjacent to each other across the differential line; a first conductor for connecting the first component and the first conductor; and a second connection conductor for connecting the second component and the second conductor. The circuit board further comprises: a first metal pattern formed between the layer for mounting the wiring and the component and to ground layer, and at a position just below the first connection conductor and the first component; and a second metal pattern formed between the layer for mounting the wiring and the component and to ground layer, and at a position just below the second connection conductor and the second component, in which the first conductor or the first connection conductor is electrically connected with the first metal pattern, and the first conductor or the second connection conductor is electrically connected with the second metal pattern. |
