Patent ID: 7199674

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 for which an equivalent circuit includes: a motional inductance, a motional capacitance, and a motional resistance connected in series between the two ports, and a first parasitic capacitance between a first port of the SAW resonator and a common voltage; a first inductance coupled between the first port of the SAW resonator and the common voltage, wherein the first inductance is sized to approximately offset a reactance of the first parasitic capacitance at a selected frequency; a first variable tuning capacitance coupled between the first port of the SAW resonator and a first port for the SAW resonator circuit; and an output port operable to be coupled to a load providing an impedance lower than an impedance of the first parasitic capacitance.