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 current router for an inducting device in an integrated circuit comprising:
one or more overpasses to electrically connect select current path regions of the inducting device, the one or more overpasses are made from a conductive layer having a first sheet resistance, each overpass having a first width; and
one or more underpasses to electrically connect different select current path regions of the inducting device, the one or more underpasses are made from a conducting layer having a second different sheet resistance, each underpass having a second different width, wherein the first width of each overpass and the second different width of an associated underpass are adjusted to make the resistance through the overpass approximately equal to the resistance through the associated underpass.
2. The current router for an inducting device in an integrated circuit of claim 1 , wherein at least one of the one or more underpasses has less than half the width of associated current path regions.
3. The current router for an inducting device in an integrated circuit of claim 1 , where at least one of the one or more underpasses has less than half the width of associated current path regions.
4. The current router for an inducting device in an integrated circuit of claim 1 , wherein the one or more overpasses are wider than the one or more underpasses.
5. The current router for an inducting device in an integrated circuit of claim 4 , wherein the one or more overpasses are wider than associated current path regions.
6. The current router for an inducting device in an integrated circuit of claim 4 , wherein the one or more underpasses are narrower than associated current path regions.
7. The current router for an inducting device in an integrated circuit of claim 1 , wherein the one or more overpasses are made narrower than the one or more underpasses.
8. The current router for an inducting device in an integrated circuit of claim 7 , wherein the one or more overpasses are narrower than associated current path regions.
9. The current router for an integrated circuit of claim 8 , wherein the one or more underpasses are wider than associated current path regions.