Patent ID: 8385748
Filing Date: 2013-02-26
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, for attenuating a frequency component corresponding to a frequency of the clock signal; wherein the trap filter is provided inside the shield; and 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 inner-layer wiring and the inner-layer ground wiring.