适用于低压EEPROM编程的双电荷泵电路系统设计

设计了一款应用于低电源电压EEPROM的双电荷泵电路结构,提供存储单元编程所需的高压。基于传统Dickson结构,设计主次两级电荷泵结构：次级电荷泵为两级升压结构,输出电压可增强时钟的驱动能力、抬高其高电平;主级电荷泵采用传输管栅压提升的结构及驱动能力增强的时钟对内部电容进行充放电,提高主级电荷泵每级的传输能力及整体电路的工作效率,最终实现低电源电压下产生高压的目的。同时,通过使能时序控制稳压系统电路,保证了输出电压的稳定性。仿真结果显示,电荷泵升降压速度快、纹波小、效率高。该双电荷泵电路已实际应用于芯片设计中,采用0.18μm EEPROM工艺流片,输出高压稳定,达到设计要求,并且性能良好。     

一种快速升压的片上电荷泵电路设计

设计了一种快速升压的片上电荷泵电路,该电路由时钟产生电路和电荷泵核组成。电荷泵核基于传统Dickson电荷结构,在前四级引入预充管,增加节点初始电压,提高电荷泵升压速度,时钟产生电路能产生占空比约为30%的稳定时钟信号,用它驱动电荷泵核可以减小充放电流失配等问题,进一步提高电荷泵升压速度。基于华虹NEC 0.35μs CMOS工艺,HSPICE仿真结果显示：在5V电源电压下,电荷泵仅需要57.625μs就可以从0V升压到20V,比传统的MOS管Dickson电荷泵快了20.055μs。     

MEMS麦克风中新型电荷泵的设计

设计了一款应用于MEMS麦克风的电荷泵电路。在动态的电荷传输开关型电荷泵中,增加了时钟电平倍增电路和负反馈电路,使得电荷泵在工艺偏差、温度以及电源电压变化时能够输出稳定的高压。电路基于0.3 μm CMOS工艺实现,Spectre仿真结果表明,在1.6~3.6 V电源电压范围及所有工艺角下,电荷泵能够输出偏差在±5%以内的14 V高压,与相同条件下的传统静态电荷传输型电荷泵相比,升压单元减少了33%,有效提高了效率,节省了面积。     

一种应用于MEMS麦克风偏置电路的电荷泵设计

MEMS麦克风需要一个高于10 V的偏置电压才能工作,这个高电压一般由内部电荷泵电路产生.在传统Dickson电荷泵结构的基础上,提出一种改进的电荷泵结构.它首先将非重叠时钟的幅度加倍,然后用幅度加倍的时钟作为电荷泵的驱动时钟,取得了明显的升压效果.Hspice仿真结果表明,电源电压为1.4V时,6级二极管-电容升压单元就可以实现10.7674 V的输出电压.与传统的Dickson升压电路相比,改进型电荷泵的升压单元减少了4级,且其核心部分的面积减小了21％,功耗降低了40％(参考SMIC 0.35 μm CMOS工艺).     

一种低电压、高增益电荷泵

电荷泵在低压电路中扮演着重要的角色。作为片上电荷泵,其面临的主要问题是:电压增益、电压纹波和面积效率。该文提出了一种新型的电荷泵电路,它采用辅助电荷泵、电平转移电路结构来产生不同摆幅的时钟,该时钟被用来驱动开关管的栅极,以有效控制开关管的电导,提高电压增益。由于采用PMOS管作为开关管,传输过程中避免了阈值电压损失。仿真结果显示,与以往文献中提到的电荷泵结构相比,该电荷泵具有更高的电压增益,开启时间短,纹波小,在低压应用环境优势更为突出。     

一种低压高效的电荷泵设计北大核心CSCD

针对于传统电荷泵结构存在的阈值压降和受体效应影响的问题,在传统四相时钟电荷泵结构基础上通过增加衬底自举电容及辅助管增大传输管的衬底电压,降低体效应的影响,提升了电荷泵电路的转换效率,降低了电荷泵电路的启动电压.电荷泵电路基于TSMC 0.18μm CMOS工艺进行设计与仿真,仿真结果表明:改进型电荷泵的工作电压可以低至0.8V,转换效率76.25%.     

用于10M/100M以太网的NRZ数据时钟恢复电路

文中采用双环系统,基于改进的Hogge鉴相器,差分电荷泵,以及一个四级环形压控振荡器实现了一种全集成的CMOS时钟恢复电路,时钟恢复的频率为125 MHz,该电路最大程度上的减小了电荷注入、电荷分享等寄生效应的影响.增加一个偏置电路使各模块的工作电源电压降低到2.94 V.整个芯片的功耗降低10%.     

用于相变存储器的超低输出纹波2X/1.5X电荷泵

本文针对相变存储器编程驱动电路,提出了一种超低输出电压纹波的开关电容型电荷泵。该电荷泵可根据输入电压的不同,自适应工作在2X/1.5X升压模式之间,以获得更高的电源转换效率。相比于传统开关电容型电荷泵,在充电阶段泵电容被充电至预先设定的电压值Vo-VDD(Vo为预期的输出电压);放电阶段,泵电容串联在输入电压VDD与输出端,通过此方法将电荷泵输出端电压稳定在Vo,并有效的降低了由于电荷分享所造成的输出纹波。在中芯国际40nm标准CMOS工艺模型下,对电路进行了仿真验证,结果表明在输入电压为1.6-2.1V,输出2.5V电压,最大负载电流为10mA,输出电压纹波低于4mV,电源效率最高可达91%。     

应用于30 GHz锁相环的高性能电荷泵设计

基于IBM 0.13 μm CMOS工艺,设计了一款应用于30 GHz低杂散锁相环的电荷泵电路。该电荷泵采用带隙基准为电流源和运算放大器提供偏置,采用复制支路和比较器实现上下电流源的静态匹配,将输入输出轨对轨运算放大器接成单位增益缓冲器来避免电荷共享效应,通过加入互补开关管来减小时钟馈通和电荷注入效应。后仿真结果表明,在电源电压为2.5 V,电荷泵电流为200 μA,调谐范围为0.5~2 V时,充放电电流的最大静态失配小于0.1%;在750 kHz环路带宽下,计算得到锁相环参考杂散小于-72 dBc,满足IEEE 802.15.3c标准对60 GHz本振信号杂散的要求。     

一种用于LCD驱动的高效电荷泵的设计

电荷泵是一种流行的获取高于供电电源的直流电压转换技术.传统的电荷泵电路采用二极管连接的NMOS管级联来获取较高的电压,由于阈值电压的作用,这种电荷泵的提升效率会随着级数的增加而下降.为了提高效率,文中提出了一种提升5倍电压的采用液晶显示器(LCD)驱动的新型电荷泵结构.特别设计了开关管的栅控电路,消除了阈值电压对电压提升效率的影响,并且通过对开关管尺寸和控制时钟的进一步优化,提高了电压转换效率,降低了功耗,特别适合于小尺寸LCD驱动的需要.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

Call for Papers

正Introduction Jointly sponsored by the China Institute of Communications(CIC)and the IEEE Communications Society(IEEE ComSoc)since the year 2013,China Communications,currently,is aiming to gradually realise the transition from journal to magazine content and style.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful