Practical Limits to Common Mode Rejection in Mode Localized Weakly Coupled Resonators
Practical Limits to Common Mode Rejection in Mode Localized Weakly Coupled Resonators
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DOI：
10.1109/jsen.2019.2930117
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发表时间：
2020-07-01
影响因子：
4.3
通讯作者：
Seshia, Ashwin
中科院分区：
文献类型：
--
作者：
Pandit, Milind;Zhao, Chun;Seshia, Ashwin
在模式局域化弱耦合谐振器中，振幅比输出度量比频移输出度量更能抑制一阶温度和压力变化。本文首次全面研究了幅值比和频移输出度量在模式局域谐振器不同工作点上的温度依赖性，并比较了不同的工作模式和不同的耦合方案。结果表明，电耦合谐振器系统的两种模式在抑制温度波动方面都比类似的机械耦合谐振器的模式提高了约10倍。与频移输出相比，机械耦合和电耦合谐振器均表现出2-3个数量级的共模抑制。首次对幅值比和差频测量结果进行了比较，结果表明两种输出指标具有相似的抑制能力。详细讨论了导致三个输出指标的温度依赖性的各种机制，从而突出了使用它们中的每个用于传感和定时应用的优点。
The amplitude ratio output metric in mode localized weakly coupled resonators has been established to show superior rejection of first order temperature and pressure variations over frequency shift output metric. This work for the first time documents a holistic study on the temperature dependence of amplitude ratio and frequency shift output metric over various operating points of a mode localized resonator while comparing different modes of operation and different coupling schemes. The results show that both modes of an electrically coupled resonator system exhibit approx 10x improvement in rejecting temperature fluctuations over the modes of similar mechanically coupled resonators. Both mechanically coupled and electrically coupled resonators showed an improvement of 2-3 orders of magnitude common mode rejection as compared to the frequency shift output. For the first time, a comparison was made between amplitude ratio and differential frequency measurements and the results showed similar rejection capabilities between the two output metrics. The various mechanisms leading to the temperature dependence of the three output metrics are discussed in detail thus highlighting the advantages of using each of them for sensing and timing applications.