Patent ID: 8269566

Claim:
A tunable resonant circuit, comprising: a first and second capacitor that each include a first and second electrode, wherein the first and second capacitors provide a matched capacitance between the first and second electrodes of the first capacitor and the first and second electrodes of the second capacitor; at least one deep-well arrangement that includes a first well disposed within a second well that is disposed within a substrate of an integrated circuit, wherein the first and second capacitors are each disposed on the first well of the at least one deep-well arrangement; a first, second, and third transistor, each disposed in the integrated circuit and each including a gate electrode and two channel electrodes, wherein: the two channel electrodes of the first transistor are respectively coupled to the second electrode of the first capacitor and the second electrode of the second capacitor; the two channel electrodes of the second transistor are respectively coupled to the second electrode of the first capacitor and to ground, and the two channel electrodes of the third transistor are respectively coupled to the second electrode of the second capacitor and to ground; and the gate electrodes of the first, second, and third transistors are responsive to a tuning signal; and an inductor coupled between the first electrode of the first capacitor and the first electrode of the second capacitor.