Surpassing fundamental limits of oscillators using nonlinear resonators.
Surpassing fundamental limits of oscillators using nonlinear resonators.
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DOI：
10.1103/physrevlett.110.177208
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发表时间：
2013-04-26
影响因子：
8.6
通讯作者：
Roukes ML
中科院分区：
文献类型：
--
作者：
Villanueva LG;Kenig E;Karabalin RB;Matheny MH;Lifshitz R;Cross MC;Roukes ML
在其最基本的形式中，振荡器由谐振驱动的谐振器组成，通过反馈产生由静态能量源维持的周期性信号。稳定频率的产生，振荡器的基本功能，通常是通过增加谐振器的运动幅度，同时保持在其线性谐波范围内来实现的。相反，这种传统的范例，在这封信中，我们表明，通过在谐振器的非谐制度的特殊点操作的振荡器，我们可以克服由于热力学噪声振荡器的性能的基本限制，以及实际的限制，由于噪声从维持电路。我们开发了一个全面的模型，占非线性振荡器的相位噪声的主要贡献。使用基于纳米机电系统的振荡器，我们通过实验验证了在操作参数空间中存在一个特殊区域，该区域能够抑制对振荡器的相位噪声的最显著贡献，正如我们的模型所预测的那样。
In its most basic form an oscillator consists of a resonator driven on resonance, through feedback, to create a periodic signal sustained by a static energy source. The generation of a stable frequency, the basic function of oscillators, is typically achieved by increasing the amplitude of motion of the resonator while remaining within its linear, harmonic regime. Contrary to this conventional paradigm, in this Letter we show that by operating the oscillator at special points in the resonator’s anharmonic regime we can overcome fundamental limitations of oscillator performance due to thermodynamic noise as well as practical limitations due to noise from the sustaining circuit. We develop a comprehensive model that accounts for the major contributions to the phase noise of the nonlinear oscillator. Using a nano-electromechanical system based oscillator, we experimentally verify the existence of a special region in the operational parameter space that enables suppressing the most significant contributions to the oscillator’s phase noise, as predicted by our model.