Acoustic wave resonator with active shunt capacitance cancellation and systems thereof
| DWPI Title: System includes acoustic wave resonator, active shunt capacitance cancelling oscillator circuit comprising amplifier, and current mirror to provide current component controlled by capacitance of inactive resonator, thus effectively cancelling out shunt capacitance associated with active resonator |
| 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. |
| Use: System used in biosensing methods. |
| Advantage: The system avoids impedance distortion and phase shift anomalies. |
| Novelty: System comprises an active resonator comprising a first piezoelectric substrate (110) having a top surface, an electrode region disposed on the top surface of the first piezoelectric substrate, and an inactive resonator comprising a second piezoelectric substrate. The electrode region is configured to launch a shear horizontal surface acoustic wave and to detect the acoustic wave transmitted through the substrate. 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. An active shunt capacitance cancelling oscillator circuit that comprises an amplifier comprising an amplifier input and an amplifier output, and a first transistor connected between the active resonator and the amplifier output. |
| Filed: 11/3/2020 |
| Application Number: US17088221A |
| Tech ID: SD 14856.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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