Patent ID: 6181219
Filing Date: 2001-01-30
Classification: H05K

Abstract:
A printed circuit board, comprising:(a) a dielectric having a surface;(b) a conductive via passing from the surface into an interior region of the dielectric, such conductive via having a wider region at a surface region of the dielectric than at an interior region of the dielectric;(c) a plurality of different levels of reference potential layers disposed in the interior region of the dielectric and parallel to the surface; and(d) a signal conductor disposed in the dielectric between, and parallel to, the reference potential layers to provide a transmission line having a predetermined impedance, such signal conductor being connected to the conductive via;wherein an edge of each of the reference potential layers is spaced from the conductive via a distance selected to provide an impedance to the transmission line substantially matched to the impedance of the transmission line.