Frequency stabilization in nonlinear micromechanical oscillators

Dario Antonio, Damián H. Zanette and Daniel López ()
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Dario Antonio: Center for Nanoscale Materials, Argonne National Laboratory
Damián H. Zanette: Consejo Nacional de Investigaciones Científicas y Técnicas, Centro Atómico Bariloche and Instituto Balseiro, 8400 Bariloche
Daniel López: Center for Nanoscale Materials, Argonne National Laboratory

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract Mechanical oscillators are present in almost every electronic device. They mainly consist of a resonating element providing an oscillating output with a specific frequency. Their ability to maintain a determined frequency in a specified period of time is the most important parameter limiting their implementation. Historically, quartz crystals have almost exclusively been used as the resonating element, but micromechanical resonators are increasingly being considered to replace them. These resonators are easier to miniaturize and allow for monolithic integration with electronics. However, as their dimensions shrink to the microscale, most mechanical resonators exhibit nonlinearities that considerably degrade the frequency stability of the oscillator. Here we demonstrate that, by coupling two different vibrational modes through an internal resonance, it is possible to stabilize the oscillation frequency of nonlinear self-sustaining micromechanical resonators. Our findings provide a new strategy for engineering low-frequency noise oscillators capitalizing on the intrinsic nonlinear phenomena of micromechanical resonators.

Date: 2012
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DOI: 10.1038/ncomms1813

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