Abstract:
The present invention relates to a wiring structure for reducing the equivalent series inductance (ESL) of a laminated capacitor. The laminated capacitor comprises a number of conductive layers, a power via extending along a thickness direction of the laminated capacitor and arranged to extend from the top conductive layer to the bottom conductive layer, and a ground via extending along the thickness direction of the laminated capacitor and arranged to extend from the top conductive layer to the bottom conductive layer. The conductive layers include a set of first conductive layers and a set of second conductive layers. The power via is electrically coupled to the first conductive layers and the ground via is electrically coupled to the second conductive layers. The laminated capacitor further comprises a supplemental via between the power via and the ground via. The supplemental via is shorter in length than the power via and the ground via. The supplemental via is electrically coupled to one of the first conductive layers and the second conductive layer.
Abstract:
PROBLEM TO BE SOLVED: To acquire superior high-speed transmission characteristics by suppressing deterioration of characteristics of a stub parasitically configured in a through hole of a printed wiring board. SOLUTION: A power supply layer/grounding layer 11 and a signal wiring 12b are interposed between dielectric layers 13, and further the through hole 12 connected to the signal wiring 12b is formed, in the printed wiring board 10, wherein a clearance 14 acting as an anti-pad is provided in a region between the through hole 12 and the power supply layer/grounding layer 11. The signal wiring 12b extends from the through hole 12 through the clearance 14 to the bottom of the power supply layer/grounding layer 11. The power supply layer/grounding layer 11 has an impedance sloping region 17 which is so formed that characteristic impedance becomes lower as far from the through hole 12, relating to the part near the power supply layer/grounding layer 11 out of the signal wiring 12b part arranged at the clearance 14 part. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a printed wiring board which prevents drooping when a lower hole is filled with an insulation material.SOLUTION: In a manufacturing method of a printed wiring board, a process where a lower hole 3 is formed on a surface part of a conductive base material 2 having a low thermal expansion coefficent and a process where a peeling film 12 is bonded to the surface part 2c of the base material 2 on a bottom surface side of the lower hole 3, thereby forming a bottom part 8 closing the bottom surface side of the lower hole 3 with the bonded film 12 are conducted. Further, in the manufacturing method, a process that the lower hole 3 is filled with an insulation material 4 and a process where multiple through holes 5 are formed in the lower hole 3 filled with the insulation material 4 are conducted.