Optimization of the close-to-carrier Phase Noise in a CMOS-MEMS oscillator using a Phase Tunable Sustaining-Amplifier

Guillermo Sobreviela, Martin Riverola, Francesc Torres, Arantxa Uranga, Nuria Barniol

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

© 2017 IEEE. In this paper, the phase noise of a 24-MHz complimentary metal-oxide-semiconductor microelectromechanical systems (CMOS-MEMS) oscillator with zero-level vacuum package is studied. We characterize and analyze the nonlinear regime of each one of the modules that compose the oscillator (CMOS sustaining-amplifier and MEMS resonator). As we show, the presented resonator exhibits a high nonlinear behavior. Such a fact is exploited as a mechanism to stabilize the oscillation amplitude, allowing us to maintain the sustaining-amplifier working in the linear regime. Consequently, the nonlinear resonator becomes the main close-to-carrier phase noise source. The sustaining amplifier, which functions as a phase shifter, was developed such that MEMS operation point optimization could be achieved without an increase in circuitry modules. Therefore, the system saves on area and power, and is able to improve the phase noise 26 dBc/Hz (at 1-kHz carrier frequency offset).
Original languageEnglish
Article number7851036
Pages (from-to)888-897
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume64
Issue number5
DOIs
Publication statusPublished - 1 May 2017

Keywords

  • MEMS oscillator
  • MEMS resonator
  • Microelectromechanical systems (MEMS) on complimentary metal-oxide-semiconductor (CMOS)
  • nonlinear MEMS
  • phase noise
  • RF MEMS

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