Passive phase noise cancellation scheme.
Passive phase noise cancellation scheme.
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DOI：
10.1103/physrevlett.108.264102
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发表时间：
2012-06-29
影响因子：
8.6
通讯作者：
Roukes ML
中科院分区：
文献类型：
--
作者：
Kenig E;Cross MC;Lifshitz R;Karabalin RB;Villanueva LG;Matheny MH;Roukes ML
介绍了一种降低振荡器相位噪声的新方法，从而提高了振荡器的频率精度。通过由一对耦合的非线性谐振元件组成的无源器件来实现噪声降低，所述非线性谐振元件由常规振荡器的输出以接近线性模式频率之和的频率参数地驱动。在参数不稳定性的阈值之上，耦合谐振器表现出自振荡，其作为对参数驱动的响应而出现，而不是通过主动反馈的应用。我们找到了该周期性信号不受驱动振荡器中的频率噪声影响的器件的工作点，从而提供了一种清除其相位噪声的方法。我们提出的结果，热噪声的影响，以推进更广泛的理解的整体噪声灵敏度和基本的操作限制。
We introduce a new method for reducing phase noise in oscillators, thereby improving their frequency precision. The noise reduction is realized by a passive device consisting of a pair of coupled nonlinear resonating elements that are driven parametrically by the output of a conventional oscillator at a frequency close to the sum of the linear mode frequencies. Above the threshold for parametric instability, the coupled resonators exhibit self-oscillations which arise as a response to the parametric driving, rather than by application of active feedback. We find operating points of the device for which this periodic signal is immune to frequency noise in the driving oscillator, providing a way to clean its phase noise. We present results for the effect of thermal noise to advance a broader understanding of the overall noise sensitivity and the fundamental operating limits.