Design and characterization of a monolithic CMOS-MEMS mutually injection-locked oscillator for differential resonant sensing

Pierre Prache, Jérôme Juillard, Pietro Maris Ferreira, Núria Barniol, Marti Riverola

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

© 2017 Elsevier B.V. This paper presents a proof of concept of a differential sensor based on the phase-difference of two injection-locked MEMS resonators, strongly coupled through their actuation voltages by a digital mixer. For the first time the feasibility of a fully monolithically co-integrated CMOS-MEMS differential resonant sensor, exploiting the capabilities of the injection-locked synchronization is proved. The principle of the system is first presented, from which optimal design guidelines are derived. The design of the different blocks of the system is then addressed. Our experimental results demonstrate the sensitivity enhancement of the proposed solution, as predicted by theory, and partial thermal drift rejection in a 70 °C range. The simulated and experimental results highlight the critical points of the system design, on which the emphasis of this article is placed.
Original languageEnglish
Pages (from-to)160-170
JournalSensors and Actuators, A: Physical
Volume269
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • CMOS-MEMS
  • Differential sensing
  • Drift rejection
  • Injection-locked oscillators
  • Microelectromechanical systems
  • System-on-chip (SOC)

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