Patent ID: 8922309

Claim:
An inductive device, comprising: an inductor implemented in a first plurality of metal layers of a number of metal layers extending from a substrate to a top metal layer, the inductor having an inductance associated therewith; and a tuning ring comprising a plurality of metal stack layers implemented in a second plurality of metal layers of the number of metal layers extending from the substrate to the top metal layer, wherein the tuning ring surrounds the inductor and has an inductance associated therewith; wherein the tuning ring is coupled to the inductor to establish a mutual inductance between the tuning ring and the inductor; wherein the inductance of the inductor, the inductance of the tuning ring, and the mutual inductance between the tuning ring and the inductor contribute to a total inductance of the inductive device; and wherein the tuning ring is configurable, and is selectively configured with a smaller number of connected metal stack layers than the second plurality of metal layers of the number of metal layers to achieve a certain value for the mutual inductance, and a certain value for the inductance of the tuning ring, without changing a footprint of the tuning ring.