基于RLC串联谐振实现电感的测量

介绍了一种测量电感的新方法,以RLC串联谐振电路为基础,将待测电感与电阻、电容串联起来组成RLC振荡电路;当电路达到谐振状态时,当电容已知,可得待测电感的值。此方法测量原理简单,操作方便,测量结果精确度较高,值得推广。     

电容电感测试仪的设计

介绍了电容电感测试仪的测量原理和电路设计方法,采用STC89C51单片机作为计算核心,以LC三点式振荡电路作为测量电路,采用固定的电感和电容组成LC振荡电路。单片机负责控制频率的测量,并利用单片机设计频率计测量得到分频后的频率,运用谐振频率公式,间接得到待测的电容值或电感值。该方案进行电容和电感的测试,具有电路原理简单、体积较小的优点。     

基于模拟电感的图示均衡器实现与MATLAB仿真

本文对RLC串联谐振回路图示均衡器的电路原理进行了研究及MATLAB仿真研究,推导出RLC串联谐振回路图示均衡器提升量与衰减量等重要设计计算公式。提出了一种模拟电感的设计电路并推导出模拟电感的设计计算公式,为将模拟电感应用于研制制作图示均衡器打下了理论基础。     

非线性RLC电路的频响特性与稳定性分析

针对非线性RLC电路的频响特性和周期解稳定性等问题,建立了电感非线性RLC串联电路的动力学方程。利用谐波平衡法,导出了电感非线性RLC串联电路的频率响应方程,研究了频率响应特性曲线的跳跃和滞后现象及其不产生谐振现象的条件;分析了该电路周期解的稳定性,得出了稳定区和不稳定区的分界线方程;讨论了非线性因素的影响,得出了忽略RLC串联电路的电感非线性因素的条件。     

电磁学组合实验仪的设计

本文根据我校大学物理实验室的现状,设计出电磁学组合实验仪,能够完成RC、RL、RLC串联电路的谐振及暂态特性、交流电桥等学生实验,能够进行电阻、电容、电感等物理量的测量。不仅给学生的学习以更大的选择空间,而且可以增强学生的综合实验和创新实验能力。     

图像均衡器

在图像均衡电路中,采用由运算放大器形成的模拟电感和电容组成的串联谐振电路,可以做到使特定频率的响应上升或下降。即,当电位器移向CUT侧时,串联谐振回路与信号回路并联连接,使谐振频率上的信号衰减。反之当移向BOOST侧时,串联谐振回     

电感、电容在有线电视传输系统中的应用

介绍电感、电容、串联电路、并联电路的特点,分析电感、电容对高频率的电视载波信号和低频率的交流信号所呈现的特性,对两信号的分离与合成进行阐述,介绍如何利用串联谐振和并联谐振回路对信号进行特殊处理.     

电感、电容在有线电视传输系统中的应用

介绍电感、电容、串联电路、并联电路的特点 ,分析电感、电容对高频率的电视载波信号和低频率的交流信号所呈现的特性 ,对两信号的分离与合成进行阐述 ,介绍如何利用串联谐振和并联谐振回路对信号进行特殊处理     

电感、电容在有线电视传输系统中的应用

介绍电感、电容、串联电路、并联电路的特点，分析电感、电容对高频率的电视载波信号和低频率的交流信号所呈现的特性，对两信号的分离与合成进行阐述，介绍如何利用串联谐振和并联谐振回路对信号进行特殊处理。     

谐振式双向开关电容变换器

根据串联电容逐个充电升压、逐个取电降压的原理,提出一种新型谐振式双向开关电容变换器.谐振电感仅为一只参数很小的电感,且无须添加辅助器件,即能完成全电路的软开关.在不改变工作方式下,实现了实时双向的电能传输,传输方向仅取决于高压端和低压端的电压值.由RLC电路谐振规律和等电量方法解得充电平均电流、传输功率、输出电压和变换效率的数学表达式.最后通过MATLAB/Simulink仿真和制作样机,进行单向模式和双向模式的实验,验证了本方案的正确性.     

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.     

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.     

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.     

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