Synthesis of Dual Mode Logic

In recent years, the major focus of VLSI design has shifted from high-speed to low-power consumption. While standard CMOS-based digital design provides substantial flexibility during pre-silicon design phases, the characteristics of the gates are set by fabrication variations and environmental conditions and cannot easily be changed at runtime. The recently proposed Dual Mode Logic (DML) family provides a novel approach to provide this capability by introducing two configurable operating modes, static and dynamic, that enable fine-grained control of the power-performance tradeoff of a logic path. However, the introduction of a new topology requires the development of both a design methodology and techniques for integration in a robust design automation flow. Standard synthesis tools do not support dynamic gates, and in particular, dual-characteristic gates. Therefore, until now, DML has been limited to small, custom-made blocks and components. In this paper, we present a novel approach for the integration of DML into standard electronic design automation tools, as part of the standard digital design flow. The development of this approach and the accompanying design methodology enables DML to be used in larger designs, such as state-of-the-art, high-speed and/or low-power SoCs. We demonstrate the employment of the proposed approach in order to benefit from DML properties, and reduce the power consumption, while simultaneously improving the operating frequency of a number of test designs.     

Mechanisms of histone lysine-modifying enzymes: A computational perspective on the role of the protein environment

Epigenetic pathways are involved in a wide range of diseases, including cancer and neurological disorders. Specifically, histone modifying and reading processes are the most broadly studied and are targeted by several licensed drugs. Although there have been significant advances in understanding the mechanistic aspects underlying epigenetic regulation, the development of selective small-molecule inhibitors remains a challenge.Experimentally, it is generally difficult to elucidate the atomistic basis for substrate recognition, as well as the sequence of events involved in binding and the subsequent chemical processes. In this regard, computational modelling is particularly valuable, since it can provide structural features (including transition state structures along with kinetic and thermodynamic parameters) that enable both qualitative and quantitative evaluation of the mechanistic details involved. Here, we summarize knowledge gained from computational modelling studies elucidating the role of the protein environment in histone-lysine modifying and reading mechanisms. We give a perspective on the importance of calculations to aid and advance the understanding of these processes and for the future development of selective inhibitors for epigenetic regulators.     

基于仿真技术的EDA实验平台设计

针对当前EDA实验过程中存在的硬件搭建容易、软件构建复杂的问题,通过采用虚拟仿真的技术,在通用PC计算机上构建一套虚拟化的EDA实验系统,该EDA实验系统中的所有功能都通过软件模拟的方式来实现,从而降低EDA实验系统的构建成本及设计的复杂程度。     

基于EDA层次化设计方法的出租车计费器设计

出租车计费器一般采用以单片机为核心的设计方法,设计不够灵活方便。为此,在此介绍了采用EDA技术的层次化设计方法设计出租车计费器的方法。即用VHDL编写各个功能模块,实现低层设计;用原理图输入方式描述各模块间的关系,实现顶层设计。采用FPGA可编程逻辑器件为系统控制单元,无需添加外围电路,更新功能仅需修改软件。实验表明,该设计方法简单快捷,所设计的系统性能可靠。应用该方法设计的数字电子系统具有很强的灵活性。     

EDA课程建设与创新型人才培养

EDA课程是教育部认定的电子类专业核心课程之一,具有软硬件知识更新速度快和应用面广等特点.本文依托中央与地方共建实验室和校级教育教学改革项目,开展EDA课程建设.我们从培养学生的实践和创新能力入手,建立了开放式的共享实验教学平台,构建了科学合理的三层次教学内容,通过多样化的教学手段,充分调动学生积极性,已收到很好的建设...     

一种基于ADS仿真的射频放大器设计方法

针对当前无线通信系统研发周期缩短、研发费用节省的需要,EDA设计工具越来越被电子技术研究的各领域所采用。以EDA中的ADS软件为设计工具,通过具体设计步骤的展示,描述了一种基于ADS仿真的射频放大器设计方法,具有积极的指导意义。在设计过程中,着重注意增益、三阶交调、稳定性等参数。最后列举了实例,说明了该设计方法的可行性。     

水泥充填体的混入对某金矿石浮选的影响及解决措施

河北某地下金矿采出矿石中水泥充填体混入率约为5%,由此造成了自然金及载金矿物黄铁矿等可浮性下降、浮选泡沫变小变黏、磨矿产品细度虚高等问题,严重影响了金的回收和生产过程的稳定。为消除水泥充填体混入带来的诸多问题,在实验室试验和工业试验基础上,对流程结构及药剂制度等进行了优化与完善,同时对尼尔森选矿机的工况等其他问题进行了完善,改造后的2014年,选矿厂的尼尔森精矿金品位和金回收率达1 656.37 g/t、21.79%,浮选精矿金品位和金回收率达107.61 g/t和70.03%,尼尔森精矿金回收率和流程总金回收率分别提高了4.42和6.47个百分点。因此,对现场暴露出的问题而言,试验确定的措施行之有效,对类似矿山具有借鉴意义。     

ODB++文件转换为可编辑PCB板图研究

目前各EDA软件无法互相读取其输出的PCB板图文件。针对以上问题,文中提出以ODB++标准为中间媒介的方法以达到EDA软件输出的PCB信息可互相读取的目的。因软件均可输出ODB++文件,文中只研究ODB++文件转换为可编辑PCB板图的方法。从实验结果可看出该方法实现了预期目的。     

基于ADS的滤波器类型选择对滤波性能的影响分析

基于ADS设计滤波器一般设计方法,提出了滤波器设计过程中类型选择对器性能有一定的影响,利用ADS滤波器设计向导,进行3种不同类型滤波器的仿真,得到在滤波器的幅频特性和群延时上,给出仿真结果,并且对仿真结果进行对比分析,综合比较得出3种类型滤波器性能的优劣,为之后滤波器的设计给出一个指导方向,具有一定的理论意义。     

垂直分工下的IC也需垂直合作

如果把"908"作为中国半导体产业发展起点的话,那么无锡就是我国微电子产业的发源地。2010年的中国IC设计年会12月初在无锡举行,来自官方发布的数据,中国IC设计公司已有40家的销售额超亿元,设计占IC的比重也由17%上