忆阻PID控制器在机械臂实时控制系统中的应用研究

目前忆阻器在忆阻神经形态电路方面的研究日渐成熟,但将其应用于实时控制电路还有待完善.本文以二关节机械臂作为研究对象,将电压阀控忆阻器与传统PID控制器相结合,设计了可用于实时电路系统的忆阻PID（M-PID）控制系统.并创新性的利用MOS管自身开关阀值,设计了带有"零态"区间的阀值忆阻器控制电路,这可有效避免因控制器频繁切换带给系统的震荡.论文利用Matlab仿真软件,从阶跃响应及位置跟踪两个层面对所设计的控制系统进行了仿真分析.仿真结果表明：所提M-PID控制算法可有效改善二关节机械臂控制系统的稳态和动态品质.     

一种分数阶忆阻器的Verilog-A模型及应用

近年来,科研人员为研究忆阻器的电气特性及其在电路中的应用,建立了多种整数阶忆阻器的Verilog-A模型,但分数阶忆阻器的Verilog-A模型还未见报道.文章提出了一种分数阶忆阻器的Verilog-A模型,对其相关特性进行了分析,总结了参数对忆阻器电气特性影响的规律,并将此模型应用于脉冲宽度调制(PWM)电路中,通过...     

基于分数阶忆阻器的混沌电路分析与设计

提出了一种新型的分数阶忆阻混沌电路.首先,建立了分数阶忆阻器的数学模型,通过数值仿真验证了分数阶广义忆阻器满足忆阻器的基本特性.然后,将分数阶广义忆阻器与蔡氏振荡电路相结合,建立了一种基于分数阶广义忆阻器的混沌电路模型.通过稳定性理论,对分数阶系统的稳定性进行了分析.为了进一步研究电路参数对系统动态行为的影响,利用相位...     

带忆阻负载的电流型Cuk变换器动力学分析及其混沌控制

基于传统的电流型Cuk变换器,采用电压控制的忆阻器作为负载构建了一种新颖的非线性切换电路.利用时序图、相图、分岔图等常规的非线性手段研究了系统参数变化时系统的基本动力学行为.通过与常规负载对比发现变换器在带有忆阻负载时具有更宽的稳定工作区间.进一步,为了确保电流型忆阻Cuk变换器能够稳定工作,推导了系统稳定运行的参数域...     

荷控忆阻器等效电路分析模型及其电路特性分析

荷孔忆阻器是一种具有记忆功能的二端式电路元件,按照Φ-q关系式与泰勒级数模式所构建的荷控忆阻器等效电路分析模型,对三次非线性荷控忆阻器模型进行深入探究分析,面向基于不同参数条件的荷控忆阻器特性开展研究,即是否有源性以及伏安关系等等。经过分析可以得出,忆阻器伏安关系拥有斜体8字形紧磁滞的回线特点,随着参数符号改变,荷控忆阻器同样会于有源性与无源性间实时转换,使得电路特性也随之变化。相比无源性荷控忆阻器,有源性荷控忆阻器更加适用于二次谐波信号。     

基于高速忆阻的超宽带信号电路

基于高速忆阻器件中拟合出的实验模型,构建SPICE模型,仿真了其忆阻特性,并利用这种高速忆阻器件设计了超宽带信号电路,模拟出了基于该忆阻模型的超宽带信号电路的频谱特性。结果表明其输出信号具有超过2GHz的带宽,该模型电路拓宽了超宽带的应用,具有较大的实用性。     

基于双曲函数的通用型荷控忆阻器电路等效模型分析

目前,忆阻器模拟器的研究主要集中在磁控忆阻器,对荷控忆阻器模拟器的研究不多,双曲函数型的荷控忆阻器模拟器也很少涉及。因此,该文提出一种基于双曲函数的通用型荷控忆阻器模拟器。模拟器通过电压-电流的相互转换电路,实现电路中电压和电流信号之间的相互转换,再通过电路中对应的电路模块对产生的信号进行计算,最终得到通用型双曲荷控忆阻器模型。模拟器能够实现双曲正弦、双曲余弦以及双曲正切函数对应的荷控忆阻器模型。通用型双曲函数荷控忆阻器模拟器对应的等效电路,主要由运算放大器、电阻、电容、三极管等基本元件组成。分析模拟器在不同幅值以及不同频率的输入信号下的伏安特性曲线,得出荷控忆阻器模拟器符合记忆元件的基本特性。该文提出的通用型双曲函数荷控忆阻器模型,对忆阻器模型的发展具有一定的参考意义。     

基于忆阻器的感存算一体技术综述

忆阻器的低功耗、高响应、纳米级、非易失性等特性,在实现非冯·诺依曼计算架构中展现出巨大潜力.基于忆阻器的高密度横梁阵列可实现数据存储及并行计算一体的逻辑电路和类脑计算电路.此外,纳米传感器与忆阻器进一步集成,采集的信号直接送往忆阻器阵列进行运算和存储,感知、存储与计算一体化的芯片技术成为新的研究热点.该文对基于忆阻器的存算一体技术、感存算一体技术的研究现状进行综述,并给出研究前景展望.     

无源电子元件忆阻器的建模和参数分析

在边界迁移模型的基础上,用分离变量法推导出了忆阻器电流电压特性的解析公式,建立了一个可用于对忆阻器进行电路仿真的SPICE模型,对忆阻器中各个参数的影响进行了分析与比较。结果发现:减小角频率、增加开关电阻比或增加平均迁移率可以提高忆阻器在同一电流值下相应的电阻差值。     

基于FPGA技术的双磁控忆阻Shinriki振荡器对称行为分析

该文通过将无源磁控忆阻器替换Shinriki振荡器中的二极管串并联支路,并利用有源磁控忆阻代替RLC谐振回路中的电阻,同时在电感支路串联电阻,得到一个新型双磁控忆阻Shinriki振荡器.通过特定参数的共存分岔图和Lyapunov指数谱,开创性地发现了振荡器具有的对称分岔行为,在双参数平面内展现运动状态分布的对称性.同时,在对称参数-初值平面的吸引盆中,分析对称域内系统的多稳态特性.并对存在的对称反单调现象、多运动状态吸引子对称共存和对称域中依赖初值的不完全对称行为进行研究.此外,基于FPGA技术完成双磁控忆阻Shinriki振荡器的数字电路实验,示波器上捕捉的波形验证了系统对称动力学行为分析的正确性.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks