Active shunt capacitance cancelling oscillator for resonators
| DWPI Title: Active shunt capacitance canceling oscillator circuit for use in resonator-based system, has active resonator comprising piezoelectric substrate, and inactive resonator for propagating acoustic mode as compared to acoustic mode |
| Abstract: The present invention relates to an active shunt capacitance cancelling oscillator circuit. Such systems can be used in resonator-based methods, while avoiding impedance distortion and phase shift anomalies. |
| Use: Oscillator circuit for use in a resonator-based system for detecting mechanical and electrical changes in a sensitive manner. |
| Advantage: The system avoids complicated signal deconvolution schemes to extract experimentally observed parameters. The system provides accurate tracking of resonator parameters such as resonant frequency, and monitoring of only the acoustic contributions to be measured. The improved circuit designs for limiting amplifiers for use in such active shunt capacitance canceling oscillator circuit are improved. The amplifiers allow for operation at higher frequencies, as well as possible lower operating resonator loss. The active resonator and/or the inactive resonator can provide an output signal that is proportional to the amplitude of oscillation, which is also proportional to resonator losses. |
| Novelty: The circuit has an active resonator with a piezoelectric substrate. An inactive resonator propagates an acoustic mode that is not acoustically active. An amplifier has an amplifier input and an amplifier output. A tank circuit is connected between ground and the amplifier input, where the tank circuit comprises an inductor, a capacitor, and a resistor. A current mirror is configured to provide a current component that is based upon a capacitance of the resonator, where the component cancels a shunt capacitance associated with the resonators. |
| Filed: 11/3/2020 |
| Application Number: US17088228A |
| Tech ID: SD 14857.1 |
| 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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