Patent ID: 8660434
Filing Date: 2014-02-25
Classification: H01P,H04B,H05K

Abstract:
1. A printed circuit board, comprising: a substrate; a signal output circuit formed on the substrate, for outputting a clock signal; a shield for covering the signal output circuit; a power supply wiring for connecting the signal output circuit and a power source; and a trap filter provided to the power supply wiring and provided inside the shield, for attenuating a frequency component corresponding to a frequency of clock signal; wherein the trap filter comprises a resonance circuit including: one portion of the power supply wiring; an inner-layer wiring of the substrate located below the one portion of the power supply wiring; an inner-layer ground wiring of the substrate located below the inner-layer wiring; and a via hole for connecting the one portion of the power supply wiring and the inner-layer wiring.