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US 12,084,708 B1Granted
Acoustic wave resonator with active shunt capacitance cancellation and systems thereof
AssigneeNational Technology & Engineering Solutions of Sandia, LLC
InventorsDarren W. Branch, Bryan Carson, DeAnna Marie Campbell, Kurt Wessendorf
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Abstract
The present invention relates to systems including an acoustic wave resonator and an active shunt capacitance cancelling oscillator circuit. Such systems can be used in biosensing methods, while avoiding impedance distortion and phase shift anomalies.
Claims24
A system comprising:
- an active resonator comprising a first piezoelectric substrate having a top surface;
- an electrode region disposed on the top surface of the first piezoelectric substrate, wherein the electrode region is configured to launch a shear horizontal surface acoustic wave and to detect the acoustic wave transmitted through the substrate;
- an inactive resonator comprising a second piezoelectric substrate, wherein the first piezoelectric substrate is configured to propagate the shear horizontal surface acoustic wave and the second piezoelectric substrate is configured to propagate an out-of-band acoustic mode, as compared to an acoustic mode comprising the shear horizontal surface acoustic wave;
- and
- an active shunt capacitance cancelling oscillator circuit that comprises:
- an amplifier comprising an amplifier input and an amplifier output;
- a first transistor connected between the active resonator and the amplifier output;
- and
- a current mirror connected between the first transistor and the amplifier input, wherein the current mirror is configured to provide a current component controlled by a capacitance of the inactive resonator, thereby effectively cancelling out a shunt capacitance associated with the active resonator.
6 more elements
A system comprising:
- an active resonator comprising a first piezoelectric substrate, where the first piezoelectric substrate has a first crystal orientation such that first acoustic waves that propagate from the first piezoelectric substrate travel in a first direction;
- an inactive resonator comprising a second piezoelectric substrate, where the second piezoelectric substrate has a second crystal orientation that differs from the first crystal orientation of the first piezoelectric substrate such that second acoustic waves that propagate from the second piezoelectric substrate travel in a second direction that differs from the first direction;
- an amplifier comprising an amplifier input and an amplifier output;
- a first transistor connected between the active resonator and the amplifier output;
- and
- a first current mirror connected between the first transistor and the amplifier input, wherein the first current mirror is configured to provide a current component controlled by a capacitance of the inactive resonator, thereby effectively cancelling out a shunt capacitance associated with the active resonator.
3 more elements
A system comprising:
- an active resonator comprising a first piezoelectric substrate, where the first active resonator has a first acoustic mode;
- an inactive resonator comprising a second piezoelectric substrate, where the inactive resonator has a second acoustic mode that is separable from the first acoustic mode of the active resonator;
- an amplifier comprising an amplifier input and an amplifier output;
- a first transistor having an input connected to the amplifier output and a non-inverting output connected to the active resonator;
- a first current mirror connected between an inverting output of the first transistor and the amplifier input;
- a second transistor having an input connected to the amplifier output and a non-inverting output connected to the inactive resonator;
- and
- a second current mirror connected between an inverting output of the second transistor and the inverting output of the first transistor, wherein the first current mirror and the second current mirror are configured to provide a current component controlled by a capacitance of the inactive resonator, thereby effectively cancelling out a shunt capacitance associated with the active resonator.
5 more elements
Dependencies are inferred from the claim text.