Continuous Phase Tuning of Vanadium Dioxide Films Using Robust Feedback Mechanism
Continuous Phase Tuning of Vanadium Dioxide Films Using Robust Feedback Mechanism
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DOI：
10.23919/acc.2019.8815224
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Jiguo Dai;Chandika Annasiwatta;A. Bernussi;Zhaoyang Fan;J. Berg;B. Ren
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作者：
Jiguo Dai;Chandika Annasiwatta;A. Bernussi;Zhaoyang Fan;J. Berg;B. Ren
二氧化钒 ($VO_{2}$) 在接近 68° C 的温度下经历金属绝缘体转变 (MIT)，这使得许多类似数字的应用成为可能，包括存储器件、传感器、相变开关等。然而，$VO_{2}$ 在尖锐且狭窄的温度窗口内的 MIT 类似数字的突变限制了其在需要具有连续可调特性的模拟操作模式的应用开发中的使用。实现 $VO_{2}$ 薄膜的精确和连续相位调谐将为不同领域的模拟应用提供更强大和更有能力的设备。与牺牲调制深度的传统化学掺杂方法不同，这项工作将强大的反馈控制机制融入$VO_{2}$薄膜中，以实现整个相变区域内中间态的连续相位调谐。为了减弱与$VO_{2}$相变相关的磁滞非线性和制造不确定性的不利影响，开发了基于不确定性和扰动估计器（UDE）的鲁棒输出反馈控制方法，以在不使用详细磁滞建模信息的情况下实现精确的连续相位调谐。然后通过实验验证验证所提出方法的有效性。
Vanadium dioxide ($VO_{2}$) undergoes a metal-insulator transition (MIT) around a temperature close to 68° C, which enables many digital-like applications including memory devices, sensors, phase change switches, etc. However, the digital-like abruptness of the MIT of $VO_{2}$ across a sharp and narrow temperature window limits its usage in the development of applications that demand an analog operation mode with continuously tunable properties. Achieving precise and continuous phase tuning of $VO_{2}$ films will enable more powerful and capable devices for analog applications in different fields. Unlike the traditional chemical doping approach which sacrifices the modulation depth, this work incorporates a robust feedback control mechanism into $VO_{2}$ films to achieve continuous phase tuning of the intermediate states within the entire phase transition region. In order to attenuate the adverse effect of hysteresis nonlinearity and manufacturing uncertainties associated with the phase transition of $VO_{2}$, the uncertainty and disturbance estimator (UDE)-based robust output feedback control approach is developed to achieve the precise continuous phase tuning without using detailed hysteresis modeling information. The effectiveness of the proposed methodology is then verified through an experimental validation.