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依据RTD/HEMT串联型RTT的概念,设计了RTD/HEMT单片集成材料结构,该结构采用分子束外延技术生长.采用湿法化学腐蚀、金属剥离、台面隔离和空气桥互连技术,研制了RTD/HEMT串联型RTT,并对RTT及RTT中RTD和HEMT的直流特性进行了测试.测试结果表明:在室温下,器件具有明显的栅控负阻特性,正接型RTT的最大峰谷电流之比在2.2左右,反接型RTT的最大峰谷电流之比在4.6左右.实验为RTD/HEMT串联型RTT性能的优化和RTD/HEMT单片集成电路的研制奠定了基础. 相似文献
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The room temperature current-voltage characteristics of InAs/AlSb/GaSb resonant interband tunneling diodes (RITDs), grown
by chemical beam epitaxy on GaAs substrates, are reported as a function of the InAs buffer layer thickness and different interface
configurations. The peak-to-valley current ratio (PVCR) improved from 1 to 12 as the buffer thickness was increased from 0
to 500 nm and the density of dislocations caused by the lattice mismatch of ∼7% decreased. No significant improvement was
seen for a buffer thickness beyond 500 nm. Dislocation-free RITDs, grown lattice-matched on InAs substrates, show PVCRs of
approximately 16. The InAs/AlSb Interfaces in these structures can be either InSb-like or AlAs-like and the interface can
have a very strong effect on the diode performance. Unlike the case in InAs/AlSb field effect transistor structures, an AlAs-like
interface results in better PVCRs in the diodes. Details of the results of this study are presented. 相似文献
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A novel mesa ultra-thin base AlGaAs/GaAs HBT is designed and fabricated with wet chemical selective etch technique and monitor electrode technique.It has a particular and obvious voltage-controlled NDR whose PVCR is larger than 120.By use of device simulation,the cause of NDR is that increasing collector voltage makes the ultra-thin base reach through and the device transforms from a bipolar state to a bulk barrier state.In addition,the simulated cutoff frequency is about 60~80GHz. 相似文献
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采用离子注入方法制作了一种新型平面共振隧穿二极管(RTD),通过离子注入将器件之间进行隔离,避免了传统台面型RTD中采用的台面刻蚀所带来的一些缺点,并且表现出良好的I-V特性,峰谷电流比为3.4.通过该方法制作的RTD将更有利于RTD的平面集成. 相似文献
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主要介绍一种支持多业务类型的广域网技术,它通过对数据、话音及其他类型数据流的协议排队、分段压缩和复用,使得多业务在一个广域网中快速可靠地传输,特别是保证延迟敏感数据的加速处理同时避免不敏感数据的处理。PowerCell无论对数据还是对话音的处理都只有很小的延迟,与ACELP-CN语音压缩算法的配合使用能提供高质量低带宽的话音通信。由于PowerCell优越的性能,它不但被应用于地面的广域网,还被广泛应用于VSAT(甚小孔径地面站)卫星通信网络中。 相似文献