Chen Changyao, Zanette Damián H, Guest Jeffrey R, Czaplewski David A, López Daniel
Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA.
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, Consejo Nacional de Investigaciones Científicas y Técnicas, 8400 San Carlos de Bariloche, Argentina.
Phys Rev Lett. 2016 Jul 1;117(1):017203. doi: 10.1103/PhysRevLett.117.017203.
Autonomous oscillators, such as clocks and lasers, produce periodic signals without any external frequency reference. In order to sustain stable periodic motion, there needs to be an external energy supply as well as nonlinearity built into the oscillator to regulate the amplitude. Usually, nonlinearity is provided by the sustaining feedback mechanism, which also supplies energy, whereas the constituent resonator that determines the output frequency stays linear. Here, we propose a new self-sustaining scheme that relies on the nonlinearity originating from the resonator itself to limit the oscillation amplitude, while the feedback remains linear. We introduce a model for describing the working principle of the self-sustained oscillations and validate it with experiments performed on a nonlinear microelectromechanical oscillator.
诸如时钟和激光器等自主振荡器，无需任何外部频率基准就能产生周期性信号。为了维持稳定的周期性运动，需要有外部能量供应，并且振荡器中要内置非线性元件来调节振幅。通常，非线性由维持反馈机制提供，该机制也提供能量，而决定输出频率的组成谐振器保持线性。在此，我们提出一种新的自持方案，该方案依靠源自谐振器自身的非线性来限制振荡幅度，而反馈保持线性。我们引入一个模型来描述自持振荡的工作原理，并用在非线性微机电振荡器上进行的实验对其进行验证。
