Patent ID: 7145239

Claim:
A circuit board having parallel conductors to carry a digital differential signal comprising: a ground plane; a first set of conductive traces having a first width dimension disposed on insulating material; a second set of conductive traces having the first width dimension and being parallel to the first set and disposed within the insulating material for an entire length of the first set, the second set being separated from the first set by a height dimension within the insulating material; and conductive material to electrically couple the corresponding traces of the first and second sets, the conductive material having the height dimension and being disposed in between the corresponding traces of the first and second sets for substantially the entire length of the corresponding traces, wherein the conductive material has a second width dimension less than the first width dimension, the first and second width dimensions being parallel, wherein the first and second sets of conductive traces run substantially parallel to the ground plane, wherein the second width dimension is substantially less than the first width dimension, and wherein the corresponding traces of the first and second sets carry opposite portions of the digital differential signal, wherein the ground plane is copper and is on a side of the non-conductive material opposite from the second set of conductive traces, and wherein a separation between the conductive traces of the first set and between the conductive traces of the second set is selected to provide coupling between the opposite portions of the digital differential signal.