共查询到20条相似文献,搜索用时 93 毫秒
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提出一种求解异质结双极晶体管(HBT)小信号等效电路模型的解析方法。在提取过程中,采用集电极开路测量和直流测量相结合的方法,精确提取到了具有物理意义的唯一的外部串联电阻值,并在精确提取非本征参数的基础上,直接提取本征参数。较大频率范围S参数的计算值与测量值有很好的吻合。 相似文献
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提出了一种用于InP高电子迁移率晶体管(high electron mobility transistor,HEMT)的分布式小信号等效电路建模方法。在采用的模型中考虑了分布电容效应,通过加入三个分布电容来表征。为了精确建模,在提取寄生电容时考虑到寄生电感引入的误差,首先提取了寄生电感。在达到50 GHz的InP HEMT中,小信号建模方法的有效性得到了验证。此外,在2~50 GHz频率范围内,S参数建模误差小于4%,这也证明了所提出建模方法的高建模精度。 相似文献
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Power performance and scalability of AlGaN/GaN power MODFETs 总被引:2,自引:0,他引:2
Alekseev E. Pavlidis D. Nguyen N.X. Chanh Nguyen Grider D.E. 《Microwave Theory and Techniques》2000,48(10):1694-1700
The scalability of power performance of AlGaN/GaN MODFETs with large gate periphery, as necessary for microwave power devices, is addressed in this paper. High-frequency large-signal characteristics of AlGaN/GaN MODFETs measured at 8 GHz are reported for devices with gatewidths from 200 μm to 1 mm. 1-dB gain compression occurred at input power levels varying from -1 to +10 dBm as the gatewidth increased, while gain remained almost constant at -17 dB. Output power density was ~1 W/mm for all devices and maximum output power (29.9 dBm) occurred in devices with 1-mm gates, while power-added efficiency remained almost constant at ~30%. The large-signal characteristics were compared with those obtained by dc and small-signal S-parameters measurements. The results illustrate a notable scalability of AlGaN/GaN MODFET power characteristics and demonstrate their excellent potential for power applications 相似文献
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Low-frequency noise characteristics in ion-implanted GaN/AlGaN/GaN and AlGaN/GaN HEMTs were investigated. The normalized spectral noise density was about 6 dB lower in GaN/AlGaN/GaN HEMTs than in AlGaN/GaN HEMTs. The normalized spectral noise density dependence on the gate length Lg indicates that the main origin of low-frequency noise is at the region under the gate in both devices. The Hooge parameters alphaH for both devices are on the order of 10-1-10- 2. The ion implantation process introduces a lot of defects in the source/drain regions, but the values of alphaH are comparable with those for conventional GaN-based HEMT devices. The values of alphaH are also lower in GaN/AlGaN/GaN HEMTs than in AlGaN/GaN HEMTs, which is due to the decrease of surface potential fluctuations in GaN/AlGaN/GaN HEMTs. 相似文献
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AlGaN/GaN界面特性研究进展 总被引:2,自引:0,他引:2
GaN是一种宽禁带半导体材料,由于具有优越的热稳定性和化学稳定性,使这种材料和与其相关的器件可以工作在高温和恶劣的环境中,并可用于大功率微波器件。本文主要介绍AlGaN/GaN有关界面特性,该特性反映了纵向纳米尺度下的能带特性;从AlGaN/GaNHEMT设计出发,给出了材料性质和结构参数对AlGaN/GaN异质结二维电子气特性影响的研究结果;讨论了AlGaN/GaN界面2DEG载流子的输运性质;分析了材料缺陷对AlGaN/GaN界面2DEG性质的影响;指出了有待研究的问题和方向。 相似文献
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对非线性电流源Ids(Vgs,Vds)的准确描述是Al GaN/GaN HEMT大信号模型的最重要部分之一.Materka模型考虑了夹断电压与Vds的关系,其模型参数只有三个,但是Ids与Vgs的平方关系不符合实际,计算结果与测量数据有误差.我们在考虑了栅电压与漏电流的关系及不同栅压区漏电流随漏电压斜率改变的基础上,提出了改进的高电子迁移率晶体管(HEMT)的直流特性模型.采用这个模型,计算了Al GaN/GaN HEMT器件的大信号I-V特性,并与实际测量数据进行了比较.实验结果表明改进的模型更精确,Ids与Vgs的呈2.5次方的指数关系. 相似文献
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S. K. Islam 《International Journal of Electronics》2013,100(12):1099-1108
In this paper, an improved temperature model for AlGaN/GaN high electron mobility transistor (HEMT) is presented. Research is being conducted for a high-performance building block for high frequency applications that combine lower costs with improved performance and manufacturability. The effects of channel conductance in the saturation region and the parasitic resistance due to the undoped GaN buffer layer have been included. The effect of both spontaneous and piezoelectric polarization induced charges at the AlGaN/GaN heterointerface has been incorporated. The proposed model is used to determine the transfer characteristics, output current-voltage characteristics and small-signal microwave parameters of HEMTs. The investigated temperature range is from 100–600 K. The small signal microwave parameters have been evaluated to determine the unity current gain cut-off frequency (f T ). High f T (10–70 GHz) values and high current levels (~550 mA/mm) are achieved for a 1 μm AlGaN/GaN HEMTs. A custom DC measurement system is used to facilitate the DC characterization of the unpackaged GaN HEMT test device. The calculated critical parameters and the simulation results suggest that the performance of the proposed device degrades at elevated temperatures. 相似文献
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A new surface-potential-based model for AlGaN/AlN/GaN high electron mobility transistor(HEMT) is proposed in this paper. Since the high polarization effects caused by AlN interlayer favorably influence the two dimensional electron gas(2DEG) and scattering mechanisms, we first add spontaneous and piezoelectric charge terms to the source equation of surface-potential, and a mobility model for AlGaN/AlN/GaN HEMT is rewritten. Compared with TCAD simulations, the DC characteristics of AlGaN/AlN/GaN HEMT are faithfully reproduced by the new model. 相似文献
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建立了包含“自热效应”的A lG aN/G aN HEM T(高电子迁移率晶体管)直流I-V特性解析模型。从理论的角度分析了自热效应对A lG aN/G aN HEM T器件的影响,并同已有的实验结果进行了对比,符合较好。证明基于这种模型的理论分析适于A lG aN/G aN HEM T器件测试及应用的实际情况。 相似文献
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《电子学报:英文版》2017,(5):952-959
A scalable large-signal model of AlGaN/GaN High electron mobility transistors (HEMTs) suitable for multi-harmonic characterizations is presented.This model is fulfilled utilizing an improved drain-source current (Ids) formulation with a geometry-dependent thermal resistance (Rth) and charge-trapping modification.The Ids model is capable of accurately modeling the highorder transconductance (gm),which is significant for the prediction of multi-harmonic characteristics.The thermal resistance is identified by the electro-thermal Finite element method (FEM) simulations,which are physically and easily scalable with the finger numbers,unit gate width and power dissipations of the device.Accurate predictions of the quiescent currents,S-parameters up to 40GHz,and large-signal harmonic performance for the devices with different gate peripheries have been achieved by the proposed model. 相似文献