编程MTM反熔丝的特征电压研究

研究了不同MTM反熔丝材料的特征电压,发现特征电压不受电极材料影响而变化。电热模型理论在硅极反熔丝编程模型中得到进一步诠释和扩展,其中MTM反熔丝编程电阻与编程电流的关系也符合魏德曼-费尔兹定律。     

MTM反熔丝单元的辐照特性研究

对MTM反熔丝单元的总剂量辐照特性进行了研究,对未编程和编程后两种状态的反熔丝单元在不同电压偏置条件下进行总剂量辐照(Co~(60)-γ射线),辐照总剂量为2 Mrad(Si)。辐照试验结果显示,未编程状态下的MTM反熔丝单元的电压-电流特性曲线基本保持不变,漏电流变化率小于10%。编程后反熔丝单元的电阻特性保持不变,并且编程电阻大小对辐照试验结果无显著影响。试验结果表明,MTM反熔丝单元的抗总剂量(Co~(60)-γ射线)辐照能力达到2 Mrad(Si)以上。     

基于非晶态铌酸锌铋薄膜的新型反熔丝器件

本文提出了一种基于非晶态铌酸锌铋（a-BZN）介质材料的新型反熔丝器件并对其性能特征进行了研究。考察了a-BZN反熔丝器件的关态特性,选用从上至下的编程方向对反熔丝器件进行击穿,其击穿电压约为6.56V。获得了a-BZN反熔丝器件的关态电阻,约为1GΩ。表征分析了击穿后的a-BZN反熔丝器件的表面形貌。研究了a-BZN反熔丝器件的编程特性以及编程后的开态特性,结果表明a-BZN反熔丝器件所需编程时间约为0.46ms,编程后其开态电阻约为26.1Ω。对比分析了a-BZN反熔丝器件与结晶态铌酸锌铋（cp-BZN）反熔丝器件和栅氧反熔丝器件在性能特征等方面的差异。     

eFuse熔丝电阻值的测量方法

作为电编程熔丝（eFuse）中的存储介质,熔丝的电阻值用来表征所存储的数据。2种采用5端口法设计的测试单元被用来测量eFuse单元中熔丝的电阻值以及编程控制管的特性参数,并应用于后续通过测试芯片测量eFuse中熔丝电阻的方案中,以间接测量eFuse编程通路的电阻值并消除漏电电流影响的方式准确推算出熔丝的电阻值。最后,提出了1种在常规eFuse中增加辅助电路来测量熔丝电阻的设计方案及测量方法。     

用于可编程器件的MTM反熔丝特性研究

基于ONO（Oxide-Nitride-Oxide）和MTM（Metal-to—Metal）反熔丝技术的可编程存储及逻辑器件已经广泛应用于空间技术中。MTM反熔丝以其单元面积小、集成度高、反熔丝电容小和编程后电阻小等优势,更加适合深亚微米集成电路。文章通过制备MTM反熔丝单元,对单元的击穿特性和漏电性能展开研究,给出了反熔丝单元漏电流与单元尺寸的关系,对单元的编程电流和编程后的电阻值关系进行了研究,与文献[1]给出的Ron=Vf/Ip的关系基本一致。     

ONO反熔丝器件可编程特性研究

ONO(Oxide-Nitride-Oxide)反熔丝器件具有可靠性高、抗辐射、高开关比等优异特性,一直用于抗辐射可编程逻辑器件.基于0.6 μm CMOS工艺,分别采用"AF+MOS"和"MOS+AF"集成方法成功制备了ONO反熔丝器件,研究了ONO反熔丝阵列单元编程特性、导通电阻与编程电流以及编程时间之间的关系,同...     

反熔丝FPGA配置电路的研究

反熔丝FPGA的编程过程是对可编程逻辑模块进行配置的过程,具体过程是利用配置电路对连接在逻辑模块输入、输出端口的反熔丝单元施加高压,将其击穿形成连接通路,从而使得逻辑模块连接在信号线上.位流数据控制配置电路完成反熔丝单元的预充电、寻址、加压以及编程过程.通过控制晶体管的打开和关断及复用编程通道,可以实现不同类型反熔丝的编程,并简化配置电路的设计规模.测试结果表明,配置电路可靠地完成了反熔丝的编程功能.     

一种应用于反熔丝FPGA的电荷泵电路

电荷泵（Charge Pump）电路以其可成倍输出自身输入电压的特性而被广泛应用于各种芯片的驱动电路中。在反熔丝FPGA中,反熔丝为高压一次编程器件,在编程过程中需要通过高压隔离管将反熔丝与其它器件隔离开,而高压隔离管在工作时需要大于芯片电源VCCA的电压来驱动,如何提供高压保证隔离管能够无损传输数据是反熔丝FPGA研发时必须要考虑的问题。本文提出了一种应用于反熔丝FPGA的电荷泵电路,电路具有快速启动的特点,同时电路工作频率可调,通过在电路中增加冗余NMOS结构,提高了电路在工作中的安全性,该电路在工作时能保证熔丝编程过程中除了反熔丝以外的其他器件不受编程电压的影响,且在编程结束后通过电荷泵输出电压打开隔离管完成信号的无损传输,能够满足反熔丝FPGA对于电荷泵的需求。     

多晶硅电学特性研究之Ⅴ:多晶硅熔丝的电编程性质

研究了冗余技术电编程电路中的多晶硅电阻熔丝的电编程特性!分析了多晶硅熔丝的编程机理和电流一电压特性。发现电阻率在0.60～1.10×10~(-3Ω·cm范围的多晶硅熔丝熔断时存在一个临界电流密度,它与熔丝的几何尺寸和室温电阻率无关,是一个约为32mA/μm~2的常数;临界电场是随熔丝室温电阻率增加的,平均熔断功率密度也与熔丝自身的电阻率相关。认为掺杂剂提供的载流子对熔丝的熔化起着重要的作用。     

反熔丝型FPGA编程方法的研究

在传统的基于反熔丝可编程逻辑阵列结构的基础上,提出一种新颖的寻址编程方法.该方法通过增加额外的编程支路,减小反熔丝单元被编程后的电阻;编程前,对所有布线通道进行预充电,防止反熔丝单元被误编程.仿真和测试结果表明,与传统的编程方式相比,该方法提高了编程的可靠性.     

Liquid Metal/Metal Oxide Frameworks

A new platform described as the liquid metal/metal oxide (LM/MO) framework is introduced. The constituent spherical structures of these frameworks are made of micro‐ to nanosized liquid metal spheres and nanosized metal oxides, combining the advantages of both materials. It is shown that the diameters of the spheres and the stoichiometry of the structures can be actively controlled. Additionally, the liquid suspension of these spheres demonstrates tuneable plasmon resonances. These spherical structures are assembled to form LM/MO frameworks which are capable of demonstrating high sensitivity towards low concentrations of heavy metal ions, and enhanced solar light driven photocalalytic activities. These demonstrations imply that the LM/MO frameworks are a suitable candidate for the development of future high performance electronic and optical devices.     

Metal Organic Framework Derivative Improving Lithium Metal Anode Cycling

This work demonstrates a new approach in using metal organic framework (MOF) materials to improve Li metal batteries, a burgeoning rechargeable battery technology. Instead of using the MIL‐125‐Ti MOF structure directly, the material is decomposed into intimately‐mixed amorphous titanium dioxide and crystalline terephthalic acid. The resulting composite material outperforms the oxide alone, the organic component alone, and the parent MOF in suppressing Li dendrite growth and extending cycle life of Li metal electrodes. Coated on a commercial polypropylene separator, this material induces the formation of a desirable solid electrolyte interphase layer comprising mechanically flexible organic species and ionically conductive lithium nitride species, which in turn leads to Li||Cu and Li||Li cells that can stably operate for hundreds of charging–discharging cycles. In addition, this material strongly adsorbs lithium polysulfides and can also benefit the cathode of lithium–sulfur batteries.     

Metal and Metal Oxide Electrocatalysts for Redox Flow Batteries

Redox flow batteries (RFBs) are one of the promising technologies for large‐scale energy storage applications. For practical implementation of RFBs, it is of great interest to improve their efficiency and reduce their cost. One of the key components of RFBs that can greatly influence the efficiency and final cost is the electrode. The chemical and structural nature of electrodes can modify the kinetics of redox reactions and the accessibility of the electroactive species to available active sites. The ideal electrocatalyst for RFBs must have good activity for the desirable redox reaction, provide a high surface area, and exhibit sufficient conductivity and durability over repeated use. One strategy is to coat the electrode with metal and metal oxide electrocatalysts. Metal electrocatalysts have the advantage of high conductivity, while metal oxide catalysts are usually less expensive and so more economically attractive. In order to gain a better understanding of the performance of the electrocatalysts in RFBs, a comprehensive review of the progress in the development of metal and metal oxide electrocatalysts for RFBs is provided and a critical comparison of the latest developments is presented. Finally, practical recommendations for advancement of electrocatalysts and effective transfer of knowledge in this field are provided.     

陶瓷与金属的活性封接

对陶瓷与金属Ti-Ag-Cu活性法出现的Ti-Ag-Cu活性合金焊料在不同金属表面的流散性进行了分析，解释了用Ti-Ag-Cu活性合金焊料焊接陶瓷和金属时不能达到真空气密的原因；同时，在实验基础上对溅射镀膜金属化焊接工艺进行了分析。     

C++程序设计教学新思路

从教学的内容、手段、环节及软环境等四个方面分析当前C^ 程序设计教学中存在的问题,提出一种以培养学生编程能力为主要目标的教学新思路。新思路从学习C^ 语言的使用、开发简单小程序→开发一定难度程序→开发较大规模软件三个层次组织教学内容,并融合相关计算机知识,引导学生建构较为完备的软件知识体系,同时根据教学内容的特点,灵活使用各种教学手段,优化总体教学效果。课程结束后,设置研究型课程设计教学环节,以有效地促使学生实现从学会C^ 语言的使用到应用C^ 语言编程解决实际问题的飞跃。     

基于EXCEL的ACCESS数据库报表程序的实现

使用ACCESS中的数据创建EXCEL报表在学校、企业中经常用到,用VC来实现会节省大量时间;简单介绍了VC使用ADO获取ACCESS数据的方法以及使用VC将获取的数据填入EXCEL生成报表的方法.     

Liquid Metal Marbles

Liquid metal marbles that are droplets of liquid metal encapsulated by micro‐ or nanoparticles are introduced. Droplets of galinstan liquid metal are coated with insulators (including Teflon and silica) and semiconductors (including WO₃, TiO_2, MoO₃, In₂O₃ and carbon nanotubes) by rolling over a powder bed and also by submerging in colloidal suspensions. It is shown that these marbles can be split and merged, can be suspended on water, and are even stable when moving under the force of gravity and impacting a flat solid surface. Furthermore, the marble coating can operate as an active electronic junction and the nanomaterial coated liquid metal marble can act as a highly sensitive electrochemical based heavy metal ion sensor. This new element thus represents a significant platform for the advancement of research into soft electronics.     

一种新的编程方法——面向Agent的程序设计

近年来，Agent和面向Agent的程序设计的研究和开发在国外得到了迅速的发展。介绍了Agent技术的基本概念和基本结构，分析了面向对象程序和面向Agent程序设计各自的特点。     

面向对象C++程序设计教学改革

程序设计课程的教学目的是培养大学生的编程能力，授课的重点应该放在算法上而不是语法。C^ 语言不是纯面向对象的语言，在教学中尽早引入面向对象的思想是学生能否接受和掌握面向对象程序设计方法的关键。新的教学体系和教材反映了C^ 的新发展，突出了函数模板和类模板的应用。实验的安排也是围绕算法展开，首先采用控制台程序训练大学生的算法编程能力，稍后引入MFC编程来培养大学生Windows下可视化编程的能力。     

Giant Magnetoresistance in a Metal–Organic Semiconductor–Metal Structure

Semiconductors - The article presents the results of investigation of the giant magnetoresistance effect in a magnetic metal–organic semiconductor–non-magnetic metal structure with a...