| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multilayer printed board in which the constants of an inductive element and a capacitive element are optimized confining to radiation- electromagnetic noise in an FM broadcasting frequency band. <P>SOLUTION: In the multilayer printed board, a bypass capacitance 110 is inserted between a power supply pattern face S and a ground pattern face G in the vicinity of an IC, and the shape of the power supply pattern face in the vicinity of the IC is elongated. The bypass capacitor is constituted so that the resonant frequency (f=1/(2π√(L1×C1)) computed by the inductive element L1 and the capacitive element C1 contained in the bypass capacitor is between the highest frequency in the FM broadcasting frequency band among the higher harmonic waves of the IC and the highest frequency in the FM broadcasting frequency band. <P>COPYRIGHT: (C)2003,JPO</p> |
