Area-efficient correlated double sampling scheme with single sampling capacitor for CMOS image sensors

An area-efficient correlated double sampling (CDS) circuit is proposed. In conventional designs, most of the area of CDS circuits is occupied by two large on-chip sampling capacitors. A new CDS scheme is devised using only one sampling capacitor. The proposed CDS circuit has been successfully realised in a small two column pitch of 7.2 /spl mu/m in a test chip fabricated using 0.18 /spl mu/m CMOS process and has demonstrated fixed pattern noise less than 0.46%.     

Parallel optical transmitter module using angled fibers and a V-grooved silicon optical bench for VCSEL array

We propose an advanced structure of optical subassembly (OSA) for packaging of the vertical-cavity surface-emitting laser (VCSEL) array, using (111) facet mirror of the V-groove ends formed in a silicon optical bench (SiOB) and angled fiber apertures. The feature of our OSA can provide a low optical crosstalk between neighboring channels, a low feedback reflection, and a large misalignment tolerance along the V-groove. We describe the optimized design of fiber angle, VCSEL position, and fiber position. The fabricated OSA structure consists of 12 channels of angled fiber array, 54.7/spl deg/ V-grooves, Au-coated mirrors on (111) end facet of the V-grooves, and flip-chip-bonded VCSEL array on a SiOB. In this structure, the beam emitted from the VCSEL is deflected at the 54.7/spl deg/ mirror of (111) end facet and propagated into the angled fiber. The angled fiber array was polished by 57/spl deg/. Fabricated OSAs showed a coupling efficiency of 30%-50% that is 25 times larger than that obtained from an OSA with a vertically flat fiber array. Our OSA showed large misalignment tolerance of about 90 /spl mu/m along the longitudinal direction in the V-groove. We fabricated a parallel optical transmitter module using the OSA and demonstrated 12 channels /spl times/2.5 Gb/s data transmission with a clear eye diagram.     

NETWORK INTRUSION DETECTION METHOD BASED ON RS-MSVM

A new method called RS-MSVM （Rough Set and Multi-class Support Vector Machine） is proposed for network intrusion detection. This method is based on rough set followed by MSVM for attribute reduction and classification respectively, The number of attributes of the network data used in this paper is reduced from 41 to 30 using rough set theory. The kernel function of HVDM-RBF （Heterogeneous Value Difference Metric Radial Basis Function）, based on the heterogeneous value difference metric of heterogeneous datasets, is constructed for the heterogeneous network data. HVDM-RBF and one-against-one method are applied to build MSVM. DARPA （Defense Advanced Research Projects Agency） intrusion detection evaluating data were used in the experiment. The testing results show that our method outperforms other methods mentioned in this paper on six aspects： detection accuracy, number of support vectors, false positive rate, falsc negative rate, training time and testing time.     

电子束重复增量扫描生成三维结构的研究

针对三维曝光图形的结构特点,结合自行设计的图形发生器,提出了电子束重复增量扫描方式及曝光剂量与刻蚀深度关系和灵敏度的计算方法.根据计算得到的剂量关系,按照重复增量扫描方式,在SDS-3电子束曝光机上进行了曝光实验,显影后得到了轮廓清晰的梯锥和圆锥的三维结构.因此,重复增量扫描方式可以用于三维结构的加工,并且关于曝光剂量与刻蚀深度关系和灵敏度的计算可以为其提供符合实际曝光的参数.     

Development of MMIC-based modules for multichannel RF/opticalsubcarrier multiplexed communications applications

We present a C-band monolithic microwave integrated circuit (MMIC) transmitter module development for multichannel RF/optical subcarrier multiplexed (OSCM) communication applications. The C-band MMIC transmitter module consists of one fully monolithic four-channel OSCM transmitter IC and four coupled-line filters. This MMIC is designed and implemented in a commercial GaAs MESFET process and coupled line bandpass filters are fabricated on the module board. We present the design and performance of the first fully monolithic IC transmitter module for OSCM packet switched applications     

转台自动控制仪设计

为了实现转台控制的自动化,需在上位机和转台之间设计接收上位机指令、输出相应脉宽调制信号的控制设备,基于这类需求设计本控制仪。就转台自动控制仪的系统设计及工作原理做了详细介绍,通过对基于单片机控制技术和光电编解码技术、滤波等的控制系统设计,实现了对转台正反转及启停控制、角度脉冲信号采集和向上位机反馈角度数据的自动化,较之原有手动控制方式,在准确性、工作效率等方面均有大幅度的提高,具有现实应用价值。     

The application of single-layer graphene modified with solution-processed TiOx and PEDOT:PSS as a transparent conductive anode in organic light-emitting diodes

There are many challenges for a direct application of graphene as the electrodes in organic electronics due to its hydrophobic surfaces, low work function (WF) and poor conductance. The authors demonstrate a modified single-layer graphene (SLG) as the anode in organic light-emitting diodes (OLEDs). The SLG, doped with the solution-processed titanium suboxide (TiO_x) and poly(3,4-ethylenedio-xythiophene)/poly(styrene sulfonic acid) (PEDOT:PSS), exhibits excellent optoelectronic characteristics with reduced sheet resistance (R_sq), increased work function, as well as over 92% transmittance in the visible region. It is notable that the R_sq of graphene decreased by ∼86% from 628 Ω/sq to 86 Ω/sq and the WF of graphene increased about 0.82 eV from 4.30 eV to 5.12 eV after a modification by using the TiO_x–PEDOT:PSS double interlayers. In addition, the existence of additional TiO_x and PEDOT:PSS layers offers a good coverage to the PMMA residuals on SLG, which are often introduced during graphene transfer processes. As a result, the electrical shorting due to the PMMA residues in the device can be effectively suppressed. By using the modified SLG as a bottom anode in OLEDs, the device exhibited comparable current efficiency and power efficiency to those of the ITO based reference OLEDs. The approach demonstrated in this work could potentially provide a viable way to fabricate highly efficient and flexible OLEDs based on graphene anode.     

AVS视频的技术特征

通过对比的方式介绍国家数字音视频编解码技术标准——AVS（Audio Video Coding Standard）中视频部分的主要技术特点与特征。     

基于Matlab的异步电动机矢量控制系统的仿真研究

在分析Matlab／Simulink环境下电力系统工具箱（Powerlib）中各元件的运行原理的基础上，采用状态空间表示方法对异步电动机矢量控制系统进行建模和仿真，分析了Simulink模块和Powerlib元件的不同本质。最后通过实例给出了交流异步电机矢量控制系统的仿真建模方法。     

间距可控的耗散孤子分子锁模光纤激光器

通过在耗散孤子锁模光纤激光器外接入马赫增德尔干涉仪,实现了间隔可控的耗散孤子分子超短脉冲输出.马赫-曾德尔干涉仪由两个50∶50分束器和一个可调谐时间延迟线构成.通过调节时间延迟线控制马赫-曾德尔干涉仪两臂的光程差,可以实现耗散孤子分子的间距连续可调谐.实验中实现了脉冲间隔分别为0.8、1.3、2.37、4.25、6....