Patent ID: 7466560

Claim:
A multilayered printed circuit board comprising: a first surface layer that includes a semiconductor integrated circuit; a second surface layer that includes a bypass capacitor 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; and a ground layer that is provided in a layer between the first and second surface layers, wherein one terminal of the bypass capacitor is connected to a midpoint of a wiring path that extends from the main power supply wiring layer to a power supply terminal of the semiconductor integrated circuit, and an impedance of a first wiring path that extends from the main power supply wiring layer to the terminal of the bypass capacitor is higher than an impedance of a second wiring path that extends from the terminal of the bypass capacitor to the power supply terminal of the semiconductor integrated circuit.