| 摘要 |
PROBLEM TO BE SOLVED: To prevent the flow of second high-frequency current to electronic circuit parts and reduce the electromagnetic noise from the circuit board. SOLUTION: There are provided an IC 2 mounted on a printed circuit board 1, a wiring pattern consisting of first power supply patterns 41, 42 that are connected to each of two terminals, a power supply pin 21 and a ground pin 22 of the IC 2, and allow supply current from a supply power layer 11 and a ground layer 12 and first ground patterns 43, 44 and a bypass capacitor 3 connected to this wiring pattern and mounted on the surface of the printed circuit board 1 on which IC 2 is mounted on the backside. The power supply layer 11 is connected with a second power supply pattern 45 provided between the power supply layer 11 and one end of the bypass capacitor 3 via a via hole 53. The ground layer 12 is connected with the first ground patterns 43, 44 via a via hole 54.
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