The quality factor of MEMS-based microresonators is often limited due to damping of the resonator structure and the surrounding air. A possible avenue to enhance the quality factor is to incorporate a negative damping feedback to reduce the damping of the resonator for those vibration modes of interest. This method is particularly easy to implement for piezoelectric based microresonators, because piezoelectric materials can serve as a sensor and an actuator simultaneously. This paper first demonstrates the concept on a silicon cantilever with a PZT thin-film actuator and a laser Doppler vibrometer as an external sensing element. Then the paper describes a design of PZT thin-film actuator consisting of a diaphragm suspension and multiple electrodes. Some of the electrodes serve as the sensors and others as actuators to reduce resonator damping. This design can potentially be used for microresonators without using external sensing elements.
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