基于非线性双路光耦的光耦放大器频响分析

频率响应是光电耦合隔离放大器的一个重要参数。首先介绍了光敏三极管光电导工作模式和集成运放宏模型,然后利用该原理对使用双路光耦设计的线性光耦隔离放大器电路进行了深入研究,分析并推导了电路频响的计算公式。对该电路的频响与电路中元件参数的关系进行了仿真和实验,最终得出结论。     

低功耗准线性CMOS光电耦合放大器

设计了一款CMOS光电耦合隔离放大器(简称光电耦合放大器),其中输入放大器采用"套筒式"共源一共栅CMOS运放A1,输出放大器选用两级共源一共源CMOS运放A2,A1的输出信号经过两个光电耦合器反馈到输入回路,且A1、A2分别引入负反馈.此外,还采取了其他的改进措施.实验结果表明,与BiCMOS光电耦合放大器相比,所设计的CMOS光电耦舍放大器的±3 dB带宽约增加14 kHz,功耗降低5.46 mW,增益线性度提高到5.9×10-5,因而特别适合于高线性度、低功耗的光电信号处理和智能检测系统中.     

光耦合线性隔离放大器ISO1OO及其应用

隔离放大器是输入端与输出端没有电气联系的放大器.光耦合隔离放大器利用LED与光电二极管传递信号而保证电气绝缘.本文分析了Burr-Brown公司生产的ISO100的性能、工作原理和各种电路形式,介绍了调整方法和使用注意事项,并给出了它的几个应用电路实例.     

MCU在显示器控制中的应用

隔离放大器是输入端与输出端没有电气联系的放大器.光耦合隔离放大器利用LED与光电二极管传递信号而保证电气绝缘.本文分析了Burr-Brown公司生产的ISO100的性能、工作原理和各种电路形式,介绍了调整方法和使用注意事项,并给出了它的几个应用电路实例.     

一种BiCMOS光电耦合隔离放大器的设计

设计了一种BiCMOS光隔离放大器,给出了其中两个运算放大器的设计电路.设计过程中只在推拉式输出级配置两个双极型晶体管(BJT),而在电路的其余部分则设置CMOS器件.为了提高放大器的增益线性度和稳定性,光电耦合部分和各运放中都引入了负反馈,并采取了优选元器件参数和提速等措施.实验结果表明所设计光隔离放大器的±3 dB带宽比双极型光隔离放大器ISO100增加了约20 kHz,当电源电压为8.6 V时,时延-功耗积比ISO100降低了约17.7 pJ,增益线性度提高到5.5×10-5,因此特别适用于高速通信系统中.     

光电线性隔离放大器的电离辐照特性

阐述了线性隔离放大器(线性光电耦合器)的工作原理,设计了线性隔离放大器的电离辐照试验,研究了线性隔离放大器的电离辐照效应,针对其结果进行了机理分析。     

线性光电耦合隔离放大器的分析及应用

本文从解决数据采集系统中模拟量的隔离问题入手,提高传输精度为关键,按反馈方式和运放接法对三种不同的放大器进行了理论分析和性能的讨论。最后给出实测结果以及一个简单、实用、精度可达±0.2％的线性光电耦合隔离放大电路。     

变压器耦合隔离放大器3656的原理及应用

隔离放大器是一种输入电路和输出电路之间电气绝缘的放大器,一般采用变压器或光耦合传递信号,在工业控制、信号测量和医疗器械等各个方面获得了广泛应用。本文介绍了Burr-Brown公司生产的变压器耦合集成隔离放大器3656的工作原理,使用和调试方法,以及它在心电图（ECG）仪和其它方面的应用。     

线性光电隔离电路的设计

光电隔离是数据采集和控制系统抗干扰的一项重要措施,由于光电耦合器件的非线性,对模拟量的光电隔离会带来较大信号失真。为了提高光电隔离电路的线性度,采用负反馈方法把光耦器件的输出电流反馈输入端。进行光电隔离电路的静态特性试验。试验结果表明：当输入信号在0～5 V时,光电隔离电路的输出失真最大为27 mV,线性度为0.014%。     

光电耦合器的发展及应用

半导体光电耦合器现已发展成为一类特殊的半导体隔离器件。它体积小、寿命长、无触点、抗干扰、能隔离，并且有单向信号传输和容易连接等功能。文中介绍了光电耦合器的典型结构和特点以及国内外的发展现状，最后给出了半导休光电隔离耦合器件的多种应用电路实例。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first