Patent ID: 7372343

Claim:
An oscillator circuit, comprising: a frequency-determining resonant circuit comprising an inductive element, a first capacitive element, and at least one second capacitive element that is connected in series with the first capacitive element, thereby defining a node therebetween; a damping reduction amplifier coupled in parallel with the frequency-determining resonant circuit; a first tuneable capacitive element coupled in parallel with the at least one second capacitive element and coupled to the node; a second tuneable capacitive element coupled in parallel with the inductive element of the resonant circuit; wherein the first tunable capacitive element is connected with a first terminal to a first terminal of the at least one second capacitive element and with a second terminal to a second terminal of the at least one second capacitive element, and wherein the first tuneable capacitive element comprises a plurality of varactors selectively coupled together in parallel; and wherein the second terminal of the first tunable capacitive element is also connected to the node between the first and at least one second capacitive element, wherein the second tuneable capacitive element comprises a plurality of varactors selectively coupled together in parallel, and wherein a capacitance value of a first varactor of the plurality of varactors in the first or second tuneable capacitive element differs from a capacitance value of a second varactor of the plurality of varactors in the first or second tuneable capacitive element, respectively, by the factor 2 n , where n is a natural number.