Patent ID: 8779881

Claim:
Circuitry comprising: a plurality of inductors, each inductor having a first end and a second end; and a switching arrangement connected to the first end and to the second end of each of the plurality of inductors for routing a current via the inductors; wherein the switching arrangement is arranged to at least one of: selectively prevent current from flowing through a subset of the plurality of inductors; and select a current flow direction through one of the inductors relative to a current flow direction through at least one other of the inductors so as to vary an effective inductance that the plurality of inductors represents to the current wherein the plurality of inductors comprises a first inductor and a second inductor, and wherein the switching arrangement comprises: a first pair of switches having a first switch connected to the first end of the first inductor and a second switch connected to the second end of the first inductor; a second pair of switches having a third switch connected to the first end of the second inductor and a fourth switch connected to the second end of the second inductor; a third pair of switches having a fifth switch connected to the first end of the first inductor and a sixth switch connected to the second end of the first inductor; and a fourth pair of switches having a seventh switch connected to the first end of the second inductor and an eighth switch connected to the second end of the second inductor.