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<p>Capacitive MEMS oscillators are widely used in RF communication and sensing systems due to their small size, low power consumption, and CMOS compatibility. However, ensuring frequency stability and suppressing phase noise under varying environmental conditions remains a critical challenge. This review highlights recent advances in capacitive MEMS oscillators, focusing on structural design innovations, fabrication techniques, energy dissipation mechanisms, and temperature compensation strategies. We analyze the operating principles of capacitive resonators and compare typical geometries such as beam, comb, and disk structures. Fabrication processes including HARPSS, DRIE, and TMDE are evaluated for their influence on Q-factor and device reliability. Advanced methods for Q-factor enhancement—such as phononic crystal structures and acoustic reflectors—are discussed in detail. Both passive and active temperature compensation techniques are reviewed, with state-of-the-art hybrid schemes achieving frequency stabilities better than ± 2&#xa0;ppm and Q-factors exceeding 100,000 in vacuum. Circuit-level innovations, including dynamic biasing and CMOS-compatible integration, further contribute to noise reduction and energy efficiency. Looking ahead, future development should emphasize cross-domain co-optimization of mechanical structures, CMOS-MEMS monolithic integration, and intelligent thermal feedback control to enable ultra-stable, low-power MEMS timing solutions for next-generation RF and IoT systems.</p> Graphical abstract <p></p>

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Stability of capacitive MEMS oscillators

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Haopeng Xu,
  • Hui Chen,
  • Yuxin Zhang,
  • Hangbing Xiao,
  • Yuxuan Wu,
  • Quan Yuan

摘要

Capacitive MEMS oscillators are widely used in RF communication and sensing systems due to their small size, low power consumption, and CMOS compatibility. However, ensuring frequency stability and suppressing phase noise under varying environmental conditions remains a critical challenge. This review highlights recent advances in capacitive MEMS oscillators, focusing on structural design innovations, fabrication techniques, energy dissipation mechanisms, and temperature compensation strategies. We analyze the operating principles of capacitive resonators and compare typical geometries such as beam, comb, and disk structures. Fabrication processes including HARPSS, DRIE, and TMDE are evaluated for their influence on Q-factor and device reliability. Advanced methods for Q-factor enhancement—such as phononic crystal structures and acoustic reflectors—are discussed in detail. Both passive and active temperature compensation techniques are reviewed, with state-of-the-art hybrid schemes achieving frequency stabilities better than ± 2 ppm and Q-factors exceeding 100,000 in vacuum. Circuit-level innovations, including dynamic biasing and CMOS-compatible integration, further contribute to noise reduction and energy efficiency. Looking ahead, future development should emphasize cross-domain co-optimization of mechanical structures, CMOS-MEMS monolithic integration, and intelligent thermal feedback control to enable ultra-stable, low-power MEMS timing solutions for next-generation RF and IoT systems.

Graphical abstract