| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source noise filtering structure of a printed wiring board which structure has a bypass capacitor mounting structure that improves an effect of suppressing high-frequency noises superposed on the current from a power supply system. SOLUTION: A power supply line is divided into two i.e. a power supply line 2a and a power supply line 2b. Capacitor mounting power pads 5a and 5b are disposed on the surfaces of division ends of the power supply lines 2a and 2b, respectively, and the division ends are connected via one electrode 4a of a bypass capacitor 4, which is a two-terminal chip capacitor. This causes the entire high-frequency noises heading from the power supply line 2a toward the power supply line 2b to flow through one electrode 4a of the bypass capacitor 4, thus improves a performance of bypassing high-frequency noises through the other electrode 4b to a GND layer 3. Hence an effect of suppressing high-frequency noises is improved. COPYRIGHT: (C)2009,JPO&INPIT
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