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Frequency multipliers (doubler and tripler) are demonstrated at room temperature, using a simple circuit that combines a load resistor with an InP-based resonant-tunneling high electron mobility transistor (RTHEMT). The RTHEMT incorporates an InGaAs/AlAs/InAs pseudomorphic resonant tunneling diode into the source of a nonalloyed ohmic contact InAlAs/InGaAs high electron mobility transistor. A nearly flat valley current is obtained in the RTHEMT's current-voltage characteristics, which results in pronounced negative transconductance throughout a wide range of drain-to-source bias voltages. As a result, frequency multipliers using RTHEMT's feature large output voltage swing and reduced power consumption 相似文献
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用MBE设备在半绝缘的InP衬底上依次生长高电子迁移率晶体管(HEMT)外延材料和共振遂穿二极管(RTD)外延材料,在此材料结构基础上研究和分析了RTD与HEMT器件单片集成工艺中的隔离工艺、欧姆接触工艺、HEMT栅挖槽工艺和空气桥工艺等几步关键工艺,给出了这些工艺的相关参数。利用上述工艺成功地制作了RTD和HEMT器件,并在室温下分别测试了RTD器件和HEMT器件的电学特性。测试表明:在室温下,RTD器件的峰电流密度与谷电流密度之比(PVCR)为3.66;HEMT器件的最大跨导约为370 mS/mm,在Vds=1.5 V时的饱和电流约为391 mA/mm。这将为RTD与HEMT的单片集成研究奠定工艺基础。 相似文献
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由RTD/MOSFET构成的新型振荡电路 总被引:2,自引:0,他引:2
基于一种新型的振荡机制,利用共振隧穿二极管(RTD)固有的负阻和双稳特性,与MOSFET器件相结合,首次实现了工作频率约为25MHz的RTD/MOSFET高频振荡电路.文章首先从理论上深入分析了该电路的振荡机理,然后通过高级设计系统(ADS)软件仿真和实验验证了此振荡电路的正确性.该电路的实现有望解决传统的基于RTD的振荡电路的功率限制问题,如果进一步用高电子迁移率晶体管(HEMT)等高频、高速器件取代MOSFET,可以在很大程度上提高这一电路的工作频率,并可实现RTD/HEMT的单片集成.因此该振荡电路在微波和射频领域具有广阔的应用前景. 相似文献
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用 PSpice对一种由串连的 RTD和 HEMT组成的单稳多稳转换逻辑 (MML)电路进行了模拟。基于自行研制的 RTD的特性曲线提取了合适的器件模型和参数 ,分析了由输入信号调节器件的峰值电流来控制器件翻转次序从而在 MML电路中实现门函数逻辑的原理并由模拟得以证实。 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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在8英寸(1英寸=2.54 cm)的Si衬底上采用金属有机化学气相沉积(MOCVD)生长了高质量、无龟裂的GaN薄膜和AlGaN/GaN高电子迁移率晶体管(HEMT)结构.通过调节应力调控层的结构,厚度为5 μm的GaN膜层翘曲度低于50 μm.采用X射线衍射(XRD)对GaN薄膜的(002)和(102)衍射峰进行扫描,其半峰全宽(FWHM)分别为182和291 arcsec.透射电子显微镜(TEM)截面图显示GaN外延层的位错密度达到了3.5×107/cm2,证实了在大尺寸Si衬底上可以制作高质量的GaN薄膜.AlGaN/GaN HEMT结构的二维电子气浓度和载流子迁移率分别为9.29×1012/cm2和2 230 cm2/(V·s).基于这些半绝缘AlGaN/GaNHEMT结构所制作的功率电子器件的输出电流可达20 A,横向击穿电压可达1 200 V. 相似文献
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A new quantum hydrodynamic transport model based on a quantum fluid model is used for numerical calculations of different quantum sized devices. The simulation of monolithic integrated circuits of resonant tunneling structures and high electron mobility transistors (HEMT) based on In/sub 053/Ga/sub 0.47/As-In/sub 052/Al/sub 0.48/As-InP is demonstrated. With the new model, it is possible to describe quantum mechanical transport phenomena like resonant tunneling of carriers through potential barriers and particle accumulation in quantum wells. Different structure variations, especially the resonant tunneling diode area and the gate width of the HEMT structure, show variable modulations in the output characteristics of the monolithic integrated device. 相似文献
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Gallium nitride (GaN) high electron mobility transistor (HEMT) with symmetrical structure as a control device is discussed in this paper. The equivalent circuit model is proposed on the basis of physical and electrical properties of the GaN HEMT device. A transistor with 0.5 μm gate length and 6 × 125 μm gate width is fabricated to verify the model, which can be treated as a single pole single throw (SPST) switch due to the ON state and OFF state. The measurement results show a good agreement with the simulation results, which demonstrates the effectiveness of the proposed model. 相似文献
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基于GaN功率器件工艺自主研发的大栅宽GaN高电子迁移率晶体管(HEMT)管芯,采用内匹配技术和宽带功率合成技术相结合的方法,研制出了一款C波段160 W连续波GaN HEMT内匹配功率器件。通过优化管芯的结构,设计出了满足连续波使用要求的大功率GaN管芯,然后进行了内匹配器件的设计,在设计中首先采用负载牵引法进行了器件参数提取,并以此为基础设计了阻抗变换网络进行阻抗变换和功率合成。研制出了工作频率为4.4~5.0 GHz、工作电压32 V、连续波输出功率大于160 W、功率附加效率大于50%、功率增益大于12 dB的GaN HEMT内匹配功率管,具有广阔的工程应用前景。 相似文献
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采用金属有机物化学气相沉积(MOCVD)方法,在6英寸(1英寸=2.54 cm)Si(111)衬底上,使用多层不同Al摩尔组分的AlGaN插入层技术,成功生长出厚度为2.9 μm无裂纹(扣除边缘2mm)的GaN外延层,解决了大尺寸外延片的翘曲度问题,并在此基础上生长了全结构的高电子迁移率晶体管(HEMT)外延片.采用X射线双晶衍射对外延材料结构进行了表征.Hall测试结果表明,HEMT外延材料的迁移率为2 080 cm2/(V·s),方块电阻为279.8 Ω/□,电荷面密度为1.07×1013 cm-2.采用喇曼光谱仪对GaN的应力进行了表征,GaN的喇曼E2(h)峰位于567.02 cm-1,表面受到的张应力为0.170 6 GPa,由于GaN外延层受到的张应力很小,说明插入多层AlGaN后应力已经释放.汞探针C-V测试二维电子气浓度较Hall测试结果偏低,可能是在C-V测试时肖特基势垒接触会降低载流子浓度. 相似文献
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Semiconductors - In this work, GaN|AlGaN high electron mobility transistor (HEMT) structures are investigated, grown on semi-insulating SiC substrates by molecular beam epitaxy and... 相似文献
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Cordier Y. Semond F. Massies J. Dessertene B. Cassette S. Surrugue M. Adam D. Delage S.L. 《Electronics letters》2002,38(2):91-92
Al0.3Ga0.7N/GaN high electron mobility transistor (HEMT) structures have been grown on resistive Si(111) substrate by molecular beam epitaxy (MBE) using ammonia (NH3). The use of an AlN/GaN intermediate layer allows a resistive buffer layer to be obtained. High sheet carrier density and high electron mobility arc obtained in the channel. A device with 0.5 μm gate length has been realised exhibiting a maximum extrinsic transconductance of 160 mS/mm and drain-source current exceeding 600 mA/mm. Small-signal measurements show ft of 17 GHz and fmax of 40 GHz 相似文献