具有应变沟道及EOT 1.2nm高性能栅长22nm CMOS器件

深入研究了亚30nm CMOS关键工艺技术,特别是提出了一种新的低成本的提高空穴迁移率的技术--Ge预非晶化S/D延伸区诱生沟道应变技术,它使栅长90nm pMOS空穴有效迁移率在0.6MV/cm电场下提高32%.而且空穴有效迁移率的改善,随器件特征尺寸缩小而增强.利用零阶劳厄线衍射的大角度会聚束电子衍射分析表明,在沟道区相应的压应变为-3.6%.在集成技术优化的基础上,研制成功了高性能栅长22nm应变沟道CMOS器件及栅长27nm CMOS 32分频器电路(其中分别嵌入了57级/201级环形振荡器),EOT为1.2nm,具有Ni自对准硅化物.     

Efficient nearly-optimal motion and structure from images via analysis of dimensional reduction: application to safety checking system

In computing 3D motion and structure from image correspondences, often called the structure from motion (SFM) problem, dimensions of the used variable set are very large because it contains both motion and structure parameters. As a result, to solve the problem incurs much computational burden. However, in on-line applications of the SFM problem, computational efficiency needs to be stressed as some accuracy of the solutions is sacrificed. In this respect, various dimensional reduction methods are often introduced to improve computational efficiency and this usually leads to various reduced-form SFM problems. The so-obtained reduced-form SFM problems depend on fewer unknowns than the original SFM problem, thus allowing, in principle, for a less computationally intensive estimation, albeit potentially sacrificing accuracy of the results. It is thus interesting to study how much accuracy is lost. This is done by analytically proving results on equivalence or proximity of solutions for some example cases of the so-obtained reduced-form SFM problems. And then, based on the analysis, the author also proposes how to reduce the loss of accuracy in the reduced-form SFM problems (in the meaning of adjusting those reduced-form SFM problems to better approximate the original optimal SFM problem; that is, an optimal SFM problem that does not use any dimensional reduction methods). Experimental results are given to show the effect in practice. Finally, as an example application, a safety checking system using vision is considered.     

基于统计特征的微弱生命体征信号提取研究

穿墙探测是雷达技术在新领域的大胆应用。本文以公司正在开发的穿墙探测雷达为基础,研究了经过人体运动(包括躯干运动和呼吸心跳等生命体征运动)调制的雷达回波的构成。根据目标回波与干扰噪声的时、频域差异,提出了以统计特征方差为判别依据的雷达生命体征信号提取算法,并用公司样机进行实验,以实际采集的数据验证了算法的有效性。     

InN薄膜的退火特性

对InN薄膜在氨气氛下的高温退火行为进行了研究.利用XRD,SEM和XPS对样品进行了分析.结果表明,InN薄膜的结晶质量和表面形貌并不随退火温度单调变化.由于高温退火时N原子的挥发,剩下的In原子在样品表面聚集形成In颗粒.当退火温度高于425℃时,In原子的脱吸附作用增加,从而导致样品表面的In颗粒在退火温度高于425℃时逐渐减少.XRD和SEM结果表明In颗粒密度最高的样品具有最差的结晶质量.这种现象可能是由于In颗粒隔离了其下面的InN与退火气氛的接触,同时,金属In和InN结构上的差异也可能在InN中导致了高密度的结构缺陷,从而降低了InN薄膜的结晶质量.     

SOI technology for radio-frequency integrated-circuit applications

This paper presents a silicon-on-insulator (SOI) integration technology, including structures and processes of OFF-gate power nMOSFETs, conventional lightly doped drain (LDD) nMOSFETs, and spiral inductors for radio frequency integrated circuit (RFIC) applications. In order to improve the performance of these integrated devices, body contact under the source (to suppress floating-body effects) and salicide (to reduce series resistance) techniques were developed for transistors; additionally, locally thickened oxide (to suppress substrate coupling) and ultra-thick aluminum up to 6 /spl mu/m (to reduce spiral resistance) were also implemented for spiral inductors on high-resistivity SOI substrate. All these approaches are fully compatible with the conventional CMOS processes, demonstrating devices with excellent performance in this paper: 0.25-/spl mu/m gate-length offset-gate power nMOSFET with breakdown voltage (BV/sub DS/) /spl sim/ 22.0 V, cutoff frequency (f/sub T/)/spl sim/15.2 GHz, and maximal oscillation frequency (f/sub max/)/spl sim/8.7 GHz; 0.25-/spl mu/m gate-length LDD nMOSFET with saturation current (I/sub DS/)/spl sim/390 /spl mu/A//spl mu/m, saturation transconductance (g/sub m/)/spl sim/197 /spl mu/S//spl mu/m, cutoff frequency /spl sim/ 25.6 GHz, and maximal oscillation frequency /spl sim/ 31.4 GHz; 2/5/9/10-nH inductors with maximal quality factors (Q/sub max/) 16.3/13.1/8.95/8.59 and self-resonance frequencies (f/sub sr/) 17.2/17.7/6.5/5.8 GHz, respectively. These devices are potentially feasible for RFIC applications.     

A combined decision fusion and channel coding scheme for distributed fault-tolerant classification in wireless sensor networks

In this paper, we consider the distributed classification problem in wireless sensor networks. Local decisions made by local sensors, possibly in the presence of faults, are transmitted to a fusion center through fading channels. Classification performance could be degraded due to the errors caused by both sensor faults and fading channels. Integrating channel decoding into the distributed fault-tolerant classification fusion algorithm, we obtain a new fusion rule that combines both soft-decision decoding and local decision rules without introducing any redundancy. The soft decoding scheme is utilized to combat channel fading, while the distributed classification fusion structure using error correcting codes provides good sensor fault-tolerance capability. Asymptotic performance of the proposed approach is also investigated. Performance evaluation of the proposed approach with both sensor faults and fading channel impairments is carried out. These results show that the proposed approach outperforms the system employing the MAP fusion rule designed without regard to sensor faults and the multiclass equal gain combining fusion rule     

浅析美国激光武器发展战略的演变

以美国海军激光武器的发展路线图和规划为例,分析美国激光武器战略的发展变化,认为美国激光武器的研发由偏重战略应用向偏重战术应用转移,更注重实战化的变化趋势。     

基于256-QAM星座图重排HARQ技术

介绍了一种基于256-QAM调制的混合ARQ(HARQ)技术,该技术通过星座图重排,降低了多级调制造成的比特之间可靠性的差异,能够显著提高HARQ的性能。首先,提出了标准的符合格雷映射关系的256-QAM星座图后,并通过选取另外3个星座图进行重排,构成基于256-QAM的4星座图影射规则。仿真结果表明该方法最终降低复杂度并提高HARQ性能,这将对未来256-QAM的应用(例如HSDPA、HSUPA)提供较大的参考价值和现实意义。     

基于MC68360视频压缩系统的设计分析

提出了一种新的嵌入式视音频压缩/解压缩系统的设计方案,该方案采用MC68360作为主控芯片,VW2010作为解压缩核心芯片.实验结果证明该方案具有可靠性高、抗干扰能力强、功耗小、性价比高等优点,可以很好地实现MPEG4标准的视音频压缩/解压缩.