Novel direct designs for 3-input XOR function for low-power and high-speed applications

Novel direct designs for 3-input exclusive-OR (XOR) function at transistor level are proposed in this article. These designs are appropriate for low-power and high-speed applications. The critical path of the presented designs consists of only two pass-transistors, which causes low propagation delay. Neither complementary inputs, nor V _DD and ground exist in the basic structure of these designs. The proposed designs have low dynamic and short-circuit power consumptions and their internal nodes dissipate negligible leakage power, which leads to low average power consumption. Some effective approaches are presented for improving the performance, voltage levels, and the driving capability and lowering the number of transistors of the basic structure of the designs. All of the proposed designs and several classical and state-of-the-art 3-input XOR circuits are simulated in a realistic condition using HSPICE with 90 nm CMOS technology at six supply voltages, ranging from 1.3 V down to 0.8 V. The simulation results demonstrate that the proposed circuits are superior in terms of speed, power consumption and power-delay product (PDP) with respect to other designs.     

压缩真空态的另一表示

本文用正规乘积内积分法证明态矢exp(λQ~2)|0>(|0>是真空谐振子态,Q=1/2~(1/2)(a+a~+))在适当地选择λ后构成压缩真空态。     

含指数函数和指数积分函数的积分

本文对电磁场问题的理论计算中常遇到的含有指数函数和指数积分函数的积分,得出了解析表达式。     

数字新疆油田建设与应用

信息化是油田发展的助推剂,"数字油田建设"是油田企业实现二次创业和腾飞的动力,必须借助数字油田建设这个强有力的支柱力量,实现油田的加快发展目标。本文通过对数字新疆油田建设的介绍,旨在对数字油田建设工程进行初步探讨,深化数字油田建设实施研究,为其它油田的数字化建设提供参考。     

孔型设计敏捷制造系统中分布式知识库结构体系研究

智能化分布式系统是敏捷制造中网络运行的先进方式.在智能化敏捷制造中,知识库的体系结构直接影响着制造智能化的水平.应用知识和重构制是实施智能化实际应用的两个方面,当应用知识不能满足应用需要时,启动重构知识库体系会得到较新的应用知识,这就是二级知识库(浅度知识库和深度知识库)体系.敏捷制造中知识库体系的研究,可为智能化敏捷制造系统提供可实施的知识体系,使整个系统具有高度的知识化.     

基于多个项目分解体系集成的数学模型与信息编码

分析了大型建设项目集成化管理中存在的问题,考虑到国家法律法规及部门规范等约束条件,建立了结构分解体系的划分准则数学模型和基于信息交互的多个项目结构分解体系的数学模型。在参考国内外各种项目编码原则的基础上,提出了统一的编码方案并进行了案例研究。     

实施PDM系统为企业带来的价值

阐述了PDM系统的功能,现代企业利用该系统对数据进行分类管理,缩短了新产品开发周期,降低了产品成本,提高了企业的管理能力,促进了企业的发展.     

System integration of high voltage electrostatic MEMS actuators

A system integration for High Voltage (HV) electrostatic MicroElectroMechanical Systems (MEMS) actuators is introduced on a micro-Printed Circuit Board. The system includes a programmable microcontroller, a programmable DC/DC converter, a multi output HV interface and electrostatic MEMS actuators. The system produces high output voltages (10–300 V) and can control a large variety of MEMS capacitive loads (1 to 50 pF) by combining diverse semiconductor technologies. This system proves that technologies, such as low voltage CMOS of different processes, high voltage DMOS and MEMS, can interact, communicate and even be integrated as a System In Package (SIP), providing significant size and cost reductions. The system was programmed to control electrostatic MEMS actuator. The DC/DC converter was made from components of different technologies and two addressable high voltage CMOS interfaces were fabricated with DALSA's 0.8 μm High Voltage process. A prototype of the global system has been built and tested.     

差分式连续时间CMOS OTA-C双二阶滤波器

应用信号流图法，提出了一种新颖的差分式连续时间电压模式CMOS跨导-电害双二阶滤波器，系统地生成了各种差分式电压模式二阶滤波器；讨论了滤波器的极点特征参数与灵敏度；面向实际电路完成了MOS管级的计算机仿真．仿真结果表明所提出的电路方案正确有效．适于全集成。