| 摘要 |
Through holes (36E) for ground and through holes (36P) for power supply are arranged in a lattice form on a core board (30) so that electromotive forces induced in the X direction and the Y direction are canceled. Mutual inductance is thereby decreased and an erroneous operation and an error are prevented even if a high frequency IC chip is mounted. Consequently, electrical characteristics and reliability can be enhanced. |
