Symmetric inducting device for an integrated circuit having a ground shield
View Patent ↗The present invention relates to integrated circuits having symmetric inducting devices with a ground shield. In one embodiment, a symmetric inducting device for an integrated circuit comprises a substrate, a main metal layer and a shield. The substrate has a working surface. The main metal layer has at least one pair of current path regions. Each of the current path region pairs is formed in generally a regular polygonal shape that is generally symmetric about a plane of symmetry that is perpendicular to the working surface of the substrate. The shield is patterned into segments that are generally symmetric about the plane of symmetry. Medial portions of at least some segments of the shield are formed generally perpendicular to the plane of symmetry as the medial portions cross the plane of symmetry.
1. A method of forming a current router to coupled select current path regions in an integrated circuit, the method comprising:
forming a first conducting layer having a first sheet resistance;
patterning the first conductive layer to forming one or more underpasses having a first width;
forming a second conductive layer having a second different sheet resistance a selected distance from the first conductive layer;
patterning the second conductive layer to form one or more overpasses having a second different width; and
wherein the resistance in each overpass is generally equal to the resistance in an associated underpass.