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在考虑发射结电压随温度的变化和发射极加入镇流电阻的情况下,给出简化的三维热电模型,用以计算功率HBT芯片表面温度分布.分析表明,对于采用均匀发射极镇流电阻设计的功率HBT,芯片中心发射极条温度最高,严重限制了器件的功率处理能力.因此提出非均匀发射极镇流电阻设计方案,并以12指Si0.8Ge0.2HBT为例,详细地给出非均匀发射极镇流电阻设计流程.结果表明,在总发射极镇流电阻阻值(各指发射极镇流电阻并联值)不变的情况下,非均匀发射极镇流电阻设计与传统的均匀设计相比,芯片中心结温显著降低,芯片表面温度趋于一致.还发现当各指发射极镇流电阻阻值从芯片边缘到中心按指数形式分布时,功率HBT的芯片表面温度更容易趋于均匀,大大提高了HBT的功率处理能力,为功率HBT的设计提供了指导. 相似文献
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报道了一种采用U形发射极新结构的高性能InGaP/GaAs HBT.采用自对准发射极、LEU等先进工艺技术实现了特征频率达到108GHz,最大振荡频率达到140GHz的频率特性.这种新结构的HBT的击穿电压达到25V,有利于在大功率领域应用.而残余电压只有105mV,拐点电压只有0.50V,使其更适用于低功耗应用.同时,还对比了由于不同结构产生的器件性能的差异. 相似文献
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新型发射极指组合结构功率SiGe HBT热分析 总被引:2,自引:0,他引:2
提出了一种发射极指分段和非均匀发射极指长、指间距组合的新型器件结构,以改善多指功率硅锗异质结双极晶体管(SiGe HBT)的热稳定性。考虑器件具有多层热阻,发展建立了相应的热传导模型。以十指功率SiGe HBT为例,运用有限元方法对其进行热模拟,得到三维温度分布。与传统发射极结构器件相比,新结构器件最高结温从416.3 K下降到405 K,各个发射指上的高低温差从7 K~8 K下降为1.5 K~3 K,热阻值下降14.67 K/W,器件整体温度分布更加均匀。 相似文献
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高性能新结构InGaP/GaAs异质结双极型晶体管 总被引:5,自引:5,他引:0
报道了一种采用 U形发射极新结构的高性能 In Ga P/ Ga As HBT.采用自对准发射极、L EU等先进工艺技术实现了特征频率达到 1 0 8GHz,最大振荡频率达到 1 4 0 GHz的频率特性 .这种新结构的 HBT的击穿电压达到 2 5 V,有利于在大功率领域应用 .而残余电压只有 1 0 5 m V,拐点电压只有 0 .5 0 V,使其更适用于低功耗应用 .同时 ,还对比了由于不同结构产生的器件性能的差异 相似文献
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A new self-aligned AlGaAs/GaAs HBT with an InGaAs emitter cap layer is presented. This HBT has nonalloyed ohmic contacts to the emitter and base that are formed simultaneously and in a self-aligned manner. The low emitter contact resistance of 1.4×10-7 ?cm2 and the high transconductance per unit area of 3.3 mS/?m2 demonstrate the effectiveness of this structure. 相似文献
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High-speed scaled-down self-aligned SEG SiGe HBTs 总被引:1,自引:0,他引:1
Washio K. Ohue E. Hayami R. Kodama A. Shimamoto H. Miura M. Oda K. Suzumura I. Tominari T. Hashimoto T. 《Electron Devices, IEEE Transactions on》2003,50(12):2417-2424
A scaled-down self-aligned selective-epitaxial-growth (SEG) SiGe HBT, structurally optimized for an emitter scaled down toward 100 nm, was developed. This SiGe HBT features a funnel-shaped emitter electrode and a narrow separation between the emitter and base electrodes. The first feature is effective for suppressing the increase of the emitter resistance, while the second one reduces the base resistance of the scaled-down emitter. The good current-voltage performance - a current gain of 500 for the SiGe HBT with an emitter area of 0.11 /spl times/ 0.34 /spl mu/m and V/sub BE/ standard deviation of less than 0.8 mV for emitter width down to about 0.13 /spl mu/m - demonstrates the applicability of this SiGe HBT with a narrow emitter. This SiGe HBT demonstrated high-speed operation: an emitter-coupled logic (ECL) gate delay of 4.8 ps and a maximum operating frequency of 81 GHz for a static frequency divider. 相似文献
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A new fully self-aligned heterojunction bipolar transistor (HBT) process has been developed to fabricate submicron emitter geometries for applications requiring ultra low-power consumption and very high-speed performance. In this novel process approach the emitter, base and collector ohmic contacts are all self-aligned to the emitter mesa. Furthermore, the three ohmic contacts, i.e., emitter, base, and collector are defined and deposited in a single metalization step thereby simplifying the fabrication process. Using this new process we have fabricated HBT emitter geometries as small as 0.3 μm2 with RF performance of over 130 GHz. To our knowledge, this is the smallest HBT ever reported 相似文献
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本文提出了一种制作HBT采用的垂直台面结构自对准工艺.利用该工艺及对A1GaAs/GaAs具有高选择比的化学湿法腐蚀剂,已研制成微波HBT.发射区台面与基极电极间隙为0.1μm,最大直流电流增益为40,截止频率f_T为10GHz. 相似文献
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The frequency performance of AlGaAs/GaAs heterojunction bipolar transistors (HBTs) having different layouts, doping profiles, and layer thicknesses was assessed using the BIPOLE computer program. The optimized design of HBTs was studied, and the high current performances of HBTs and polysilicon emitter transistors were compared. It is shown that no current crowding effect occurs at current densities less than 1×105 A/cm2 for the HBT with emitter stripe width S E<3 μm, and the HBT current-handling capability determined by the peak current-gain cutoff frequency is more than twice as large as that of the polysilicon emitter transistor. An optimized maximum oscillation frequency formula has been obtained for a typical process n-p-n AlGaAs/GaAs HBT having base doping of 1×10 19 cm-3 相似文献
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研制成功了一种无微空气桥的亚微米InP基异质结双极晶体管(HBT).发展了小于100nm的发射极侧向腐蚀工艺,实现了亚微米的InP基HBT.发射极宽度的减小有效提高了频率特性,发射极面积为0.8μm×15μm的HBT的电流增益截止频率达到了238GHz.发展了基极-集电极的侧向过腐蚀工艺,有效减小了结面积,提高了最大振荡频率.Kirk电流密度达到了3.1mA/μm2.据我们所知,电流增益截止频率是目前国内三端器件中最高的,Kirk电流密度是国内报道的HBT中最高的.这对于HBT器件在超高速电路中的应用具有十分重要的意义. 相似文献
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了计算带有发射极边减薄结构的异质结双极晶体管 (EET- HBT:Emitter Edge Thinning- HeterojunctionBipolar Transistor)的电流增益 ,提出了发射极边偏移电压的概念 .在将它引入 Gum mel- Poon模型后 ,对不同结构的 EET- HBT的直流电流增益进行了计算 ,并将计算结果与已发表的实验数据作了比较 .计算表明 ,修正后的Gum mel- Poon模型能够较好的反映出采用 EET结构后对增益的改善作用 ,钝化边长度越长、器件发射结的面积越小 (周长 /面积比越大 ) ,钝化的效果越好 .计算结果显示采取薄发射区设计也能起到与 EET结构同样的钝化效果 .计算结果可以为高性 相似文献