共查询到19条相似文献,搜索用时 203 毫秒
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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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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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提出了发射极非均匀指间距技术以增强多发射极指SiGe HBT在不同环境温度下的热稳定性。通过建立热电反馈模型对采用发射极非均匀指间距技术的SiGe HBT进行热稳定性分析,得到多发射极指上的温度分布。结果表明,与传统的均匀发射极指间距SiGe HBT相比,在相同的环境温度及耗散功率下,采用发射极非均匀指间距技术的SiGe HBT,其最高结温明显降低,热阻显著减小,温度分布更加均匀,有效地提高了多发射极指功率SiGe HBT在不同环境温度下的热稳定性。 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
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The thermal and electro stability of multi-finger heterojunction bipolar transistors (HBTs) with different structures were analyzed and discussed simultaneously. The thermal stability of the devices with different layout struc-tures was assessed by the DC-Ⅳ test and thermal resistance calculation. Their electro stability' was assessed by the calculation of the stability factor K based on the S parameter of the HBT. It is found that HBTs with higher thermal stability are prone to lower electro stability. The trade-off relationship between the two types of stability was explained and discussed by using a compact K-factor analytic formula which is derived from the small signal equivalent circuit model of HBT. The electro stability of the device with a thermal ballasting resistor was also discussed, based on the analytic formula. 相似文献
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Jin Dongyue Zhang Wanrong Shen Pei Xie Hongyun Wang Yang Zhang Wei He Lijian Sha Yongping Li Jia Gan Junning 《Solid-state electronics》2008,52(6):937-940
Multi-finger power SiGe heterojunction bipolar transistors (HBTs) with emitter ballasting resistor and non-uniform finger spacing are fabricated, and temperature profiles of them are measured. Experimental results show that both of them could improve the temperature profile compared with an HBT which has uniform finger spacing. For the HBT with emitter ballasting resistor, the ability to lower the peak temperature is weakened as power increases. However, for the HBT with non-uniform finger spacing, the ability to improve temperature profile is kept over a wide biasing range. Therefore, the experimental results directly prove that the technique of non-uniform finger spacing is a better method for enhancing the thermal stability of power HBTs over a wide biasing range. 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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Gao G.-B. Unlu M.S. Morkoc H. Blackburn D.L. 《Electron Devices, IEEE Transactions on》1991,38(2):185-196
A systematic investigation of the emitter ballasting resistor for power heterojunction bipolar transistors (HBTs) is presented. The current handling capability of power HBTs is found to improve with ballasting resistance. An equation for the optimal ballasting resistance is presented, where the effects of thermal conductivity of the substrate material and the temperature coefficient of the ballasting resistor are taken into account. Current levels of 400 to 800 mA/mm of emitter periphery at case temperatures of 25 to -80°C for power AlGaAs/GaAs HBTs have been obtained using an on-chip lightly doped GaAs emitter ballasting resistor. Device temperature has been measured using both an infrared microradiometer and temperature-sensitive electrical parameters. Steady-state and transient thermal modeling are also performed. Although the measured temperature is spatially nonuniform, the modeling results show that such nonuniformities would occur for a uniform current distribution, as would be expected for an HBT with emitter ballasting resistors 相似文献
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Shimura T. Sakai M. Izumi S. Nakano H. Matsuoka H. Inoue A. Udomoto J. Kosaki K. Kuragaki T. Takano H. Sonoda T. Takamiya S. 《Electron Devices, IEEE Transactions on》1995,42(11):1890-1896
High power and high-efficiency multi-finger heterojunction bipolar transistors (HBT's) have been successfully realized at Ku-band by using an optimum emitter ballasting resistor and a plated heat sink (PHS) structure. Output power of 1 W with power-added efficiency (PAE) of 72% at 12 GHz has been achieved from a 10-finger HBT with the total emitter size of 300 μm2. 72% PAE with the output power density of 5.0 W/mm is the best performance ever reported for solid-state power devices with output powers more than 1 W at Ku-band 相似文献
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L波段150W宽带硅脉冲功率晶体管 总被引:3,自引:2,他引:1
设计了一种称之为多晶硅覆盖树技状结构的双极型微波功率晶体管。该器件采用掺砷多晶硅发射极,同时具备有覆盖和树枝状两种图形结构的优点。器件引入扩散电阻和分布式多晶硅电阻组合而成的发射极复合镇流电阻,实现对发射极电流二次镇流,器件表现出良好的微波性能和高的可靠性。经内匹配,在L波段脉冲输出大于100W(36V),脉宽150μs,工作比10%,增益大于7.5dB,效率大于45%,器件最大输出达150W(42V)。 相似文献
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相对于同质结晶体管,异质结双极晶体管(HBT)由于异质结的存在,电流增益不再主要由发射区和基区掺杂浓度比来决定,因此可以通过增加基区掺杂浓度来降低基区电阻,提高频率响应,降低噪声系数,但基区掺杂浓度对器件热特性影响的研究却很少。以多指SiGeHBT的热电反馈模型为基础,利用自洽迭代法分析了基区重掺杂对器件集电极电流密度和发射极指温度的影响。通过研究发现,随着基区浓度的增加,SiGe HBT将发生禁带宽度变窄,基区反向注入发射区的空穴电流增大;同时,基区少子俄歇复合增强,这些都将减小集电极电流密度,降低发射极指温度,从而抑制发射极指热电正反馈,提高器件的热稳定性。 相似文献