A micromechanical parametric oscillator for frequency division and phase noise reduction
A micromechanical parametric oscillator for frequency division and phase noise reduction
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用于分频和降低相位噪声的微机械参量振荡器
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
C. Nguyen
中科院分区：
文献类型：
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作者：
T. Rocheleau;Ruonan Liu;J. Nilchi;T. Naing;C. Nguyen
电容间隙转导微机械谐振器阵列展示了第一个基于片上mems的分频器，通过使用参数振荡效应，从121 mhz电驱动器产生61 mhz输出，该分频器不仅提供了频率除以2功能所需的近载波相位噪声降低6 dB，而且通过具有91,500的极高机械Q的滤波，还提供了远载波噪声显著降低23 dB。与传统的分频器（即预分频器）不同，参数振荡器免除了有源器件及其相关噪声，并且以接近于零的功耗运行，原则上仅受克服MEMS谐振器损耗所需的功率限制，这里估计为100 nW。差分版MEMS分频器的输入摆幅仅为445 mVpp，输出电压摆幅为450 mVpp，根据实际锁相环和频率合成器的需要，可以实现全无源分频器的级联链。
A capacitive-gap transduced micromechanical resonator array has demonstrated a frst on-chip MEMS-based frequency divider with 61-MHz output generated from a 121-MHz electrical drive through use of a parametric oscillation effect that provides not only the 6 dB reduction in close-to-carrier phase noise expected for a frequency divide-by-two function, but also a remarkable 23 dB reduction in far-from-carrier noise provided by fltering with an extremely high mechanical Q of 91,500. Unlike conventional frequency dividers (i.e., prescalers), the parametric oscillator dispenses with active devices and their associated noise, and operates with close to zero power consumption, limited in principle only by the power required to overcome MEMS resonator loss, estimated here at 100 nW. With an output voltage swing of 450 mVpp generated from only 445 mVpp of input swing on a differential version of this MEMS divider, cascaded chains of fully passive dividers are possible, as needed for use in real-world phase-locked loops and frequency synthesizers.