Patent ID: 7929315
Filing Date: 2011-04-19
Classification: H05K

Abstract:
1. A multilayered printed circuit board comprising: a first surface layer that a semiconductor integrated circuit is mounted to; a second surface layer that a bypass capacitor is disposed to and that is provided on a face of the multilayered printed circuit board opposite to a face of the multilayered printed circuit board on which the first surface layer is provided; a main power supply wiring layer that is provided in a layer between the first and second surface layers; a ground layer that is provided in a layer between the first and second surface layers; and a first power-supply via hole that extends from the first surface layer to the second surface layer and that is not electrically connected to the main power supply wiring layer, wherein one terminal of the bypass capacitor is connected to a point of a wiring path that extends from the main power supply wiring layer to a power supply terminal of the semiconductor integrated circuit, and wherein an impedance of a first wiring path that extends from the main power supply wiring layer to the power supply terminal of the semiconductor integrated circuit is higher than an impedance of a second wiring path that extends from the bypass capacitor to the power supply terminal of the semiconductor integrated circuit.