Frequency stabilization in nonlinear micromechanical oscillators
Frequency stabilization in nonlinear micromechanical oscillators
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DOI：
10.1038/ncomms1813
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发表时间：
2012-05-01
影响因子：
16.6
通讯作者：
Lopez, Daniel
中科院分区：
文献类型：
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作者：
Antonio, Dario;Zanette, Damian H.;Lopez, Daniel
机械振荡器存在于几乎所有的电子设备中。它们主要由提供具有特定频率的振荡输出的谐振元件组成。它们在特定时间段内保持确定频率的能力是限制其实施的最重要参数。从历史上看，石英晶体几乎完全被用作谐振元件，但微机械谐振器越来越多地被认为是替代它们。这些谐振器更容易集成，并允许与电子器件单片集成。然而，由于它们的尺寸缩小到微尺度，大多数机械谐振器表现出非线性，大大降低了振荡器的频率稳定性。在这里，我们证明，通过耦合两个不同的振动模式，通过内部谐振，它是可能的，以稳定的非线性自持微机械谐振器的振荡频率。我们的研究结果提供了一个新的策略，工程低频噪声振荡器利用微机械谐振器的固有非线性现象。
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.