Patent ID: 6909334

Claim:
For use in an oscillator, a two port SAW resonator circuit for providing a tunable low phase noise oscillator signal comprising: a two port SAW resonator; at least one inductance coupled to a port of the SAW resonator, wherein the at least one inductance is connected and sized to reduce tune out a stray capacitance seen at the port within an equivalent circuit for the SAW resonator at a selected frequency such that any residual stray capacitance seen across the inputs or outputs has a magnitude less than a magnitude of a motional capacitance within the equivalent circuit for the SAW resonator; and at least one variable tuning capacitance coupled between the port of the SAW resonator and an input or output port for the SAW resonator circuit, wherein the at least one tuning capacitance forms a series resonance circuit with the SAW resonator and may be selectively employed to alter a resonant frequency of the SAW resonator circuit.