PSoC平台在电子综合课程设计中的应用

电子综合课程设计是一门培养学生使用理论知识设计电子系统的实践课程。笔者尝试将美国Cypress公司最新的片上可编程系统PSoC引入电子综合课程设计教学中,旨在培养学生使用单芯片内的模拟模块、数字模块和微处理器,设计复杂电子系统的能力。本文从不同角度,说明PSoC平台在提高电子综合课程设计教学质量,以及在培养学生分析问题和解决问题能力方面的优势。     

研究性教学在电子课程设计中的实践

本文对我校多年以来电子课程设计中存在的问题进行分析,同时针对问题提出研究性教学的实践模式,从设计过程、指导方式、实现方式和互动教学等方面进行了教学实践,分析总结了实践效果,提出电子课程设计应和研究性教学的理念相结合,体现系统工程的思想。     

高频电子线路实践教学的建设和探索

高频电子线路是通信和电子专业的重要专业基础课,实践教学是其中的一个重要方面。本文介绍了高频电子线路实践教学中的具体做法和体会,总结了教学经验。着重对实验装置的设计、实践项目的规划以及实践教学的一些具体方法进行探讨。目的是提高学生动手能力,从而提高教学质量。文章中以课程设计为例阐述教学方法的具体实施,包括仿真与实际凋试的关系和课程设计中进行不同角度的应用等。实践证明,效果良好。     

“自动控制系统”课程设计新模式的探究

"自动控制系统"课程设计是培养学生实践能力、创新能力和综合能力的重要环节.本文在分析现行"自动控制系统"课程设计存在主要问题的基础上,结合自动化专业特点,探索新的课程设计教学模式,改革课程设计实践环节的教学内容、教学手段和考核方法,全面培养学生的工程实践能力和创新能力,从而实现理论知识与工程实践的有机结合.     

NI平台在医学电子仪器课程设计中的应用

医学电子仪器课程设计是加强生物医学工程专业实践,提升学生电子仪器设计技术和创新能力的重要环节。本文通过一个带通滤波器的电路设计、仿真、实际电路搭建和采用虚拟仪器测试实际电路的完整的设计过程,展示了NI电子学教育平台在培养学生设计技能和实践能力方面的作用。     

电子工艺实习的实践

随着现代科学技术的飞跃发展,对工科院校的学生掌握综合技能的要求越来越高。为了适应新的形势提高学生的动手能力,加强对电子工艺知识及操作技能的培养,我们开设了面对学校工科电类,非电类各有关专业的电子工艺实习必修课。其目的是通过电子工艺实习为以后的实验课、课程设计、毕业设计,以及从事有关的电子技术工作奠定实践基础。     

基于差异化策略的自动控制课程设计探索

针对自动控制课程设计教学过程中的实验独立性、理论实践相结合等问题,本文构建了一种基于差异化策略的自动控制课程设计模式.该模式采用差异化教学思想,对课程设计的任务体系、实验对象、实验手段和考核方法等多个方面进行差异化改进.教学实践结果表明,该课程设计模式能够提高学生学习的积极性和独立性,增强学生理论与实践相结合的能力.     

基于CDIO模式的SystemView平台《通信原理》课程设计

《通信原理》作为通信工程,电子信息工程专业的一门主干课程。该课程教学长期存在着重理论轻实践,学生自我动手实践能力差等问题。因而本课程设计将基于CDIO的教学理念,以SystemView软件为项目设计平台,将传统教学与项目教学有效地融合在一起。更好的培养学生的动手能力,实践能力及解决问题的能力。     

高频电子线路课程设计改革实践与体会

剖析了学生在高频电子线路课程设计中暴露的问题,提出了必须加强学生硬件基础训练、协作精神和故障排除能力的培养,并阐述对课程设计及相关实践环节的改革实践。     

基于项目教学法的课程设计改革

本文针对我校"电工与电子技术"课程设计的实施现状,提出以实际应用为背景,以课程内容为依托,基于项目教学法对课程设计进行改革与实践的新思路.实践表明,该改革不仅具有激发兴趣、巩固基础、引导探索和提升能力的属性,而且在深化课程设计实践教学效果的同时,能够建立不同课程设计之间的联系,因而具有较好的示范作用与教学效果.     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

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.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.