Lithium Niobate MEMS Chirp Compressors for Near Zero Power Wake-Up Radios
Lithium Niobate MEMS Chirp Compressors for Near Zero Power Wake-Up Radios
复制标题
用于近零功耗唤醒无线电的铌酸锂 MEMS 线性调频脉冲压缩机
DOI：
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发表时间：
2017
影响因子：
2.7
通讯作者：
S. Gong
中科院分区：
文献类型：
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作者：
T. Manzaneque;Ruochen Lu;Yansong Yang;S. Gong
本文首次提出了一种基于悬浮态LiNbO_3薄膜横向振动模式的啁啾压缩机。在双色散延迟线结构中，实现了水平剪切和长度拉伸两种模式，机电耦合系数分别为30%和39%。高机电耦合，加上悬浮薄膜中的低传播损耗，在50%的大带宽范围内产生了10dB的低插入损耗。最好制作的器件展示了100的延迟带宽乘积，并为相应的线性调频信号提供了5的电压增益。此外，Chirp压缩器的处理增益和滤波特性共同实现了显著的信噪比增强(>；100)。在本文中，测量的器件在插入损耗方面远远优于基于表面声波的最先进的线性调频压缩机，具有相当的TB。因此，在无源器件和模拟域中首次同时展示了信噪比增强和电压增益。高性能可用于极大地提高接近零功率的唤醒无线电接收器的灵敏度，并支持物联网应用的低功率无线连接。[2017-0126]
This paper presents the first demonstration of chirp compressors based on laterally vibrating modes in suspended lithium niobate thin films. Both shear-horizontal and length-extensional modes have been explored and demonstrated with the electromechanical coupling coefficients of 30% and 39%, respectively, in a double-dispersive delay line structure. The high electromechanical coupling, along with the low propagation loss in the suspended thin film, produces a low insertion loss of 10 dB over a large fractional bandwidth of 50%. The best fabricated device demonstrates a delay-bandwidth product of 100, and provides a voltage gain of 5 to the corresponding chirp signals. Moreover, significant signal-to-noise ratio enhancements (>100), collectively enabled by the processing gain and filtering characteristics of the chirp compressors, have been demonstrated. The measured devices, in this paper, greatly outperform state-of-the-art chirp compressors based on surface acoustic waves in insertion loss for a comparable TB. As a result, signal-to-noise ratio enhancement and voltage gain have been simultaneously demonstrated for the first time in a passive device and the analog domain. The high performance can be harnessed to greatly enhance the sensitivity of near zero power wake-up radio receivers and enable low-power wireless connectivity for Internet of Things applications. [2017–0126]