Dual-mode oscillator for stress compensated cut resonator
| DWPI Title: Parallel-type dual-mode oscillator for use in self-measuring frequency application, has resonator resonating at lower frequency and upper and including input tank circuit coupled to resonator |
| Abstract: Both parallel-type and serial-type dual-mode oscillators employing stress compensated cut resonators having various configurations are disclosed. Both classes of dual-mode oscillators employ multiple tank circuits to pass one frequency of the resonator and block the other frequency. The tank circuits isolate the operation of the two oscillator sub-circuits that form the dual-mode oscillator from one another. The dual-mode oscillators may be implemented with either bipolar or CMOS transistors. The parallel-type dual-mode oscillators employ inverters to provide gain. The serial-type dual-mode oscillators employ a two (or three) stage design including a follower circuit first stage and an inverting amplifier/limiter circuit second stage, with an optional intervening transimpedance amplifier stage. |
| Use: Parallel-type dual-mode oscillator e.g. bridge-type oscillator, for use in a self-measuring frequency application. |
| Advantage: The tank circuits in each of the oscillator sub-circuits are located parallel with the resonator to pass the lower frequency by the tank circuit while blocking the upper frequency, thus effectively dampening non-resonator modes caused by the oscillators and the resonator shunt capacitance. The oscillator is easy to design, and obtains sufficient separation of the modes between two oscillator subsystems. |
| Novelty: The oscillator (200) has a resonator resonating at a lower frequency and an upper frequency. An oscillator sub-circuit operates at the lower frequency, and includes an input tank circuit coupled to the resonator. An inverter (240) is coupled to another tank circuit, where the inverter inverts a signal from the latter tank circuit. A third tank circuit (230) is coupled in parallel to the former resonator, and contains capacitive impedance at lower and upper frequencies, where series combination of a capacitor and an inductor resonates at lower frequency. |
| Filed: 2/7/2022 |
| Application Number: US17666014A |
| Tech ID: SD 15515.1 |
| 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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