PRINTED CIRCUIT BOARD

• Main Author: SEKIJIMA DAISHIRO
• Format: Patent
• Language: English; Japanese
• Published: 16.02.2015
• Subjects: BASIC ELECTRONIC CIRCUITRY; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; RESONATORS

PROBLEM TO BE SOLVED: To make an area of a printed circuit board small when an LC resonance type filter capable of reducing a common mode component, which is generated when a differential signal is transmitted, is formed by conductors of a printed wiring board.SOLUTION: Signal conductor patterns 211, 212 are disposed at a conductor layer 201 and a ground conductor pattern 213 is disposed at a conductor layer 203. A conductor pattern 221 is disposed at a conductor layer 202 and a conductor pattern 222 is disposed at a conductor layer 204. The signal conductor pattern 211 and the conductor pattern 221 are connected by a via conductor 231 and the signal conductor pattern 212 and the conductor pattern 222 are connected by a via conductor 232. At least parts of the conductor patterns 221, 222 overlap with the ground conductor pattern 213 when viewed in a Z direction. Further, at least parts of the conductor patterns 221, 222 overlap with each other. 【課題】差動信号の伝送時に発生するコモンモード成分を低減できるＬＣ共振型フィルタをプリント配線板の導体で構成する際に、プリント配線板を小面積にすること。【解決手段】導体層２０１に信号導体パターン２１１，２１２が配置され、導体層２０３にグラウンド導体パターン２１３が配置されている。導体層２０２に導体パターン２２１が配置され、導体層２０４に導体パターン２２２が配置されている。信号導体パターン２１１と導体パターン２２１とがヴィア導体２３１で接続され、信号導体パターン２１２と導体パターン２２２とがヴィア導体２３２で接続されている。導体パターン２２１，２２２は、Ｚ方向から見て、少なくとも一部がグラウンド導体パターン２１３に重なっている。また、導体パターン２２１，２２２は、少なくとも一部が互いに重なっている。【選択図】図１