Patent ID: 6914493

Claim:
For use in an oscillator, a two port differential mode SAW resonator circuit for providing low phase noise in hostile environments comprising: a two port SAW resonator having two inputs and two outputs; at least one inductance coupled to one or more inputs or outputs of the SAW resonator, wherein the at least one inductance is connected and sized to reduce a stray capacitance seen across the inputs or outputs 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 connected in series with the one or more inputs or outputs of the SAW resonator, wherein the at least one tuning capacitance may be employed to alter a resonant frequency of the SAW resonator circuit.