Patent ID: 7692300

Claim:
A printed circuit board, comprising: a printed wiring board; a semiconductor which is mounted on the printed wiring board and includes a semiconductor chip, the semiconductor having a first power supply terminal, a second power supply terminal, a first ground terminal, and a second ground terminal; a first circuit for supplying power to the semiconductor chip, the first circuit comprising: a source power supply, a first power supply wiring for connecting the first power supply terminal of the semiconductor with the source power supply, a first ground wiring for connecting the first ground terminal of the semiconductor with the source power supply, and a first bypass capacitor which connects the first power supply wiring and the first ground wiring; and a second circuit comprising: a second power supply wiring connected to the second power supply terminal of the semiconductor, a second ground wiring connected to the second ground terminal of the semiconductor, and a second bypass capacitor which connects the second power supply wiring and the second ground wiring, wherein: the first power supply terminal and the second power supply terminal are at the same potential; the first power supply terminal is electrically connected to the second power supply terminal only within the semiconductor; and the first ground wiring is electrically connected to the second ground wiring only within the semiconductor.