基于流量工程的自动交换光网络新路由协议研究

为了研究基于流量工程的自动交换光网络(ASON)路由协议,采用基于源标签交换路由(LSR)路由泛供、仅广播链路可用带宽的增减的方法,得到了该协议能使LSR根据准确的带宽信息和波长可用信息选择路由的结果.结果表明,当链路中每个节点信息负荷量较小时,该协议拥有最小的链路阻塞率;与传统的路由机制相比,它能减少4～7倍的控制开销.     

采用改进电流调制功耗缩放的精度和速度可编程流水线模数转换器

介绍了一个精度和速度可编程、但不需要改变运算放大器偏置电流的流水线模数转换器,实现了8～11bit和400k～40MSa/s的程控范围.提出了一种新颖的预充型开关运放,在降低功耗的同时,可以使运算放大器快速开启.通过采用改进的电流调制功耗缩放技术、新颖的开关运放技术、采样保持电路消去技术和动态比较器,大大降低了电路的功耗.电路设计采用1.8V 1P6M 0.18μm CMOS工艺,仿真结果表明:在11bit,40MSa/s性能条件下,输入信号为19.02MHz时,无杂散动态范围(SFDR)为81dB,信噪失真比(SNDR)为67dB,功耗为29mW.     

The rise and fall of spatio-temporal clusters in mobile ad hoc networks

Cluster detection has been widely applied to the problem of efficient data delivery in highly dynamic mobile ad hoc networks. By grouping participants who meet most often into clusters, hierarchical structures in the network are formed which can be used to efficiently transfer data between the participants. However, data delivery algorithms which rely on clusters can be inefficient in some situations. In the case of dynamic networks formed by encounters between humans, sometimes called Pocket Switched Networks (PSNs), cluster based data delivery methods may see a drop in efficiency if obsolete cluster membership persists despite changes to behavioural patterns. Our work aims to improve the relevance of clusters to particular time frames, and thus improve the performance of cluster based data delivery algorithms in PSNs. Furthermore, we will show that by detecting spatio-temporal clusters in PSNs, we can now improve on the data delivery success rates and efficiency of data delivery algorithms which do not use clustering; something which has been difficult to demonstrate in the past.     

Programmable SC Biquad Using One Single Capacitor Bank

This paper presents a new technique for programming SC circuits using a single time-multiplexed capacitor bank, achieving a significant reduction in capacitance area. Simulation and experimental results obtained with a programmable biquad low pass filter show the validity of the proposed method.Antonio Torralba was born in Seville, Spain. He received the electrical engineering and Ph.D. degrees from the University of Seville, Seville, Spain, in 1983 and 1985, respectively. Since 1983, he has been with the Department of Electronic Engineering, School of Engineering, University of Seville, where he has been an Assistant professor, Associate Professor (1987), and Professor (1996). He has published 30 papers in journals and more than 80 papers in conferences. His research interests are in the design and modeling of low-voltage analog circuits, analog and mixed-signal design, analog to digital conversion, and electronic circuits and systems with application to control and communication.Alfredo Pérez Vega-Leal was born in Seville, Spain. He received the Electrical Engineering and Ph.D. degrees from the University of Seville, Seville, Spain, in 1998 and 2003, respectively. Since 1995, he has been with the Department of Electronic Engineering, School of Engineering, University of Seville, as research student and became an Associate Professor in 1999. His research interests are related to low-voltage low-power analog circuit design, A/D and D/A conversion.Ramón González Carvajal was born in Seville, Spain. He received the Electrical Engineering and Ph.D. degrees from the University of Seville, Seville, Spain, in 1995 and 1999, respectively. Since 1996, he has been with the Department of Electronic Engineering, School of Engineering, University of Seville, where he has been an Associate Professor (1996), and Professor (2002). He has published more than 100 papers in International Journals and Conferences. His research interests are related to low-voltage low-power analog circuit design, A/D and D/A conversion, and analog and mixed signal processing.     

基于开关电容阵列的高速多元激光回波数字化技术

设计了基于新型开关电容阵列技术的激光回波数字化系统,实现了每秒5G个采样点 (Gigabit Samples per Second, GSPS)的采样速率。利用单片模拟数字转换器件(Analog Digital Converter, ADC)实现了多元信号采样。该系统具有很大的发展潜力。介绍了多米诺环形采样器(Domino Ring Sampler, DRS)4的控制策略。设计了基于DRS4芯片的激光回波数字化电路,搭建了激光测试系统,并开展了基于DRS4的信号采样实验。实验结果表明,采用DRS4芯片进行激光回波数字化,能够达到最高5GSPS的采样速率,可实现多元系统设计,增大视场,同时降低系统功耗和成本。     

双模式高集成负电荷泵电路设计

提出了一种新颖的双模式高集成开关电容电荷泵。该电荷泵集成高频振荡器、电平移位、逻辑驱动以及4个功率MOSFET开关。与传统电荷泵相比,该电路可以工作在单电源以及双电源两种模式。单电源模式下,输出电压为-VCC;双电源模式下,输出电压为-3×VCC。电路采用0.35μm BCD工艺实现。测试结果表明:室温时,单电源模式和双电源模式下电荷泵输出电流分别为36 mA和80 mA时输出电压分别为-3.07 V和-12.10 V。在-55℃到125℃温度范围内,单电源模式和双电源模式下电荷泵输出电流分别为24 mA和50 mA时输出电压分别低于-3.06 V和-12.35 V。该电荷泵在两种模式下工作特性良好,已应用于相关工程项目。     

A Continuous Time Auto-Zero Offset Compensated Switched Capacitor Integrator

A continous mode CMOS switched capacitor integrator with almost zero offset is presented. The offset is compensated using an auto-zero technique and proper circut elements have been used to attenuate disturbances due to charge injection and clock feedthrough. The circuit includes two parallel paths which operate alternately in order to integrate in one path while compensating the offset in the other path. The circuit is capable of removing the offset voltage and its integral, and many other spurious signals at the output. The designed integrator has an initial offset of about –250 V which raises to an amount of about –400 V after one second of integration.     

自动交换光网络的信令控制方式研究

自动交换光网络是一种能够自动完成网络连接的新型网络。他由控制面、传送面和管理面3个平面组成，控制面技术是其核心，利用控制面能够实施动态交换。本文在研究分析已有的光网络信令控制方式的基础上，提出了一种混合信令控制方式，他具有更好的性能和信令控制能力，适合ASON的信令网和控制面要求。     

开关磁阻电机基于转矩脉动最小化的直接转矩控制技术

开关磁阻电机的主要缺点是转矩脉动较大以及振动和噪声比其他调速系统严重。这里将直接转矩控制技术应用到开关磁阻电机中,以转矩脉动最小化为主要控制目标,在此基础上建立了直接转矩控制的仿真模型。仿真及实验研究表明,直接转矩控制技术能够将磁链矢量幅值很好地控制在滞环带内,从而有效地控制转矩脉动,降低电机的振动和噪声。     

移动通信系统中的波束转换智能天线设计

提出了在现有GSM移动通信系统中蜂窝基站采用波束转换智能天线的设计方案,对天线系统各组成部分如天线模块、收发射频模块、射频交换矩阵模块、高速扫描接收机等功能、作用、信号关系、设计要点作了探讨。若将各相邻小区配置波束转换智能天线,可有效提高网络的载噪比。