The purpose of this study is to systematically examine advancements in microelectromechanical system (MEMS) oscillators, with a focus on their role as not only timing references but also high-sensitivity sensing platforms. This study highlights how frequency stability underpins their performance in applications such as environmental monitoring, biomedical sensing and industrial automation.
Adopting a sensor-oriented perspective, this review analyzes frequency stabilization techniques across resonator design, interface electronics and system integration. This paper covers sensor-relevant aspects including materials (e.g. AlN and ScAlN), transduction mechanisms (piezoelectric and capacitive), low-noise readout circuits, temperature compensation methods and nonlinear dynamic behavior. Emphasis is placed on implementations suitable for physical, chemical, biological and temperature sensors.
MEMS oscillators have evolved into dual-functional platforms for both timing and sensing. Innovations in resonator design – such as high-Q bulk acoustic modes and phononic structures – coupled with active compensation circuits (e.g. TIA-based interfaces and TDS-PLLs) enable frequency stabilities below ± 1 ppm and ultra-fine resolution in temperature, pressure and mass sensing. Nonlinear phenomena, including parametric resonance and synchronization, further enhance stability and enable novel sensing modalities.
This paper uniquely bridges MEMS oscillator stability with broader sensor applications, offering a unified review of resonator physics, circuit interfacing and system integration from a sensing perspective. This study identifies emerging trends such as multimode resonant sensing, oscillator-based sensor networks and nonlinear dynamic sensing, providing a forward-looking resource for researchers developing next-generation intelligent sensor systems.
