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Accurate modeling of the electrothermal effects of GaN electronic devices is critical for reliability design and assessment. In this paper, an improved temperature-dependent model for large signal equivalent circuit modeling of GaN HEMTs is proposed. To accurately describe the thermal effects, a modified nonlinear thermal sub-circuit which is related not only to power dissipation, but also ambient temperature is used to calculate the variations of channel temperature of the device; the temperature-dependent parasitic and intrinsic elements are also taken into account in this model. The parameters of the thermal sub-circuit are extracted by using the numerical finite element method. The results show that better performance can be achieved by using the proposed large signal model in the range of -55 to 125℃ compared with the conventional model with a linear thermal sub-circuit. 相似文献
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结合石墨烯场效应晶体管和机械谐振原理,研究了基于本地背栅石墨烯谐振沟道晶体管(RCT) 的高频机械信号直接读取方法.利用机械剥离法获得的石墨烯,提出了一种基于刻蚀技术的器件制备方法, 并实现了栅长和栅宽分别为1 μm的本地背栅RCT.实验结果表明,在室温下RCT的谐振频率范围为57.5–88.25 MHz.研究结果对加速石墨烯纳米机电系统和高频低噪声器件的应用有着重要作用.
关键词:
石墨烯
谐振沟道晶体管
纳米机电系统 相似文献
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设计了一种用于无线局域网(WLAN)的平面柔性天线。该天线的设计采用厚度为127μm 的聚酰亚
胺薄膜作为天线的印制板,利用电容加载的单极子天线结构,使其获得了柔性和双频宽带的性能。整个天线被
10μm 厚度的Parylene-C 保护涂层所覆盖,使天线具备了良好的防潮、防水等性能。对天线在平面和各种弯曲状态下
的性能进行了测试,测试结果表明,该天线在工作频带内的回波损耗优于10dB,具有较好的全向辐射特性,实验结果
表明该天线可以应用于柔性通信设备中。 相似文献
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A terahertz on-chip InP-based power combiner designed using coupled-grounded coplanar waveguide lines
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This article presents the design and performance of a terahertz on-chip coupled-grounded coplanar waveguide (GCPW) power combiner using a 50 μm-thick InP process. The proposed topology uses two coupled-GCPW lines at the end of the input port to substitute two quarter-wavelength GCPW lines, which is different from the conventional Wilkinson power combiner and can availably minimize the coverage area. According to the results obtained, for the frequency range of 210-250 GHz, the insertion losses for each two-way combiner and four-way combiner were lower than 1.05 dB and 1.35 dB, respectively, and the in-band return losses were better than 11 dB. Moreover, the proposed on-chip GCPW-based combiners achieved a compromise in low-loss, broadband, and small-size, which can find wide applications in terahertz bands, such as power amplifiers and signal distribution networks. 相似文献
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