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2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS)最新文献

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An SRAM based testing methodology for yield analysis of semiconductor ICs 基于SRAM的半导体集成电路良率分析测试方法
Jannah Al-Hashimi, Seepsa Tomoq, K. Abugharbieh, Yazan Al-Qudah, Mustafa Shihadeh
This work presents a methodology to analyze defects in an SRAM cell based on electrical testing which can help improve yield of semiconductor ICs. It uses an algorithm that utilizes fuzzy logic techniques to post process electrical measurements to analyze the point(s) of failure. To model the impact of opens and shorts in the SRAM cell, a number of resistors were added in various locations in the schematic of a cell where a defect can occur. Simulations were run where these resistors were shorted or opened according to their location(s) and the defect(s) they represent. The work was conducted using 28 nm technology device models. Design and simulations were done using Synopsys transistor level Custom Designer software that includes HSPICE. MATLAB was used to implement the fuzzy logic based algorithm to post process the electrical simulations' results. The algorithm presented in this paper can be modified for different technology nodes and can be used by design and yield engineers in industry.
本文提出了一种基于电测试的SRAM单元缺陷分析方法,有助于提高半导体集成电路的良率。它使用了一种算法,利用模糊逻辑技术后处理电测量来分析故障点。为了模拟SRAM单元中开路和短路的影响,在可能发生缺陷的单元示意图中的不同位置添加了许多电阻。根据这些电阻器的位置和它们所代表的缺陷,在这些电阻器被短路或打开的情况下进行了模拟。这项工作是使用28纳米技术的器件模型进行的。采用包含HSPICE在内的Synopsys晶体管级定制设计软件进行设计和仿真。利用MATLAB实现基于模糊逻辑的算法,对电学仿真结果进行后处理。本文提出的算法可以针对不同的技术节点进行修改,可供工业设计和良率工程师使用。
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引用次数: 0
Mapping for unknown environment using incremental triangulation 使用增量三角测量的未知环境映射
Amna Al Dahak, L. Seneviratne, J. Dias
Autonomous robot exploration and map building for unknown environments is essential in a wide range of applications such as search and rescue, surveillance, military and other high risk scenarios. As the robot starts exploring its surroundings, it accumulatively builds a partial map of the environment composing of the areas that are currently known by the robot. In this work we present a new exploration and mapping solution that will capture the environment structure geometrically. The proposed Triangulation-Based exploration maps the environment using the Dynamic Triangulation Tree structure (DTT) developed in this study. Using triangles to store the geometry of the environment will significantly reduce the storage space required when compared to the occupancy grids used in many exploration and map building solutions. The efficiency of the proposed mapping structure is validated experimentally through simulations.
在搜索和救援、监视、军事和其他高风险场景等广泛应用中,自主机器人探索和未知环境的地图构建至关重要。当机器人开始探索周围环境时,它会累积构建一个由机器人当前已知区域组成的环境局部地图。在这项工作中,我们提出了一种新的探索和映射解决方案,将以几何方式捕捉环境结构。提出的基于三角测量的勘探利用本研究开发的动态三角测量树结构(DTT)来绘制环境图。与许多探索和地图构建解决方案中使用的占用网格相比,使用三角形来存储环境的几何形状将大大减少所需的存储空间。仿真实验验证了该映射结构的有效性。
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引用次数: 0
The DTMOS based UHF RF to DC conversion 基于DTMOS的UHF射频到直流转换
S. Chouhan, K. Halonen
The RF rectifier is a key component in wireless sensor networks and RFID applications. It converts the input RF signal into DC voltage to power up a system. Low settling time is important for efficiently acquiring DC voltage in an RFID system. The settling time is defined as the time required by the rectifier to reach the maximum stable DC voltage for a given load condition. The main focus of this work is to reduce the settling time required by the rectifier. Settling time is one of the performance limitations of a rectifier due to the threshold voltage of the transistor. In this work, we are proposing the use of DTMOS (Dynamic Threshold MOSFET) architecture in the design of RF to DC rectifier. In DTMOS, gate and body are tied together, which dynamically alters the threshold voltage to suit the operating state of the circuit. We implemented the DTMOS architecture in a self Vth cancellation (SVC) scheme based rectifier. Settling time is considered as the performance parameter. Results demonstrate that settling time of the modified SVC rectifier is less than 50%, as compared to that of the conventional BTMOS(body terminal tied to source terminal) based SVC rectifier structure. The rectifiers have been implemented using the 180nm standard CMOS technology and the simulations were performed using spectre simulator.
射频整流器是无线传感器网络和RFID应用中的关键部件。它将输入的射频信号转换成直流电压,为系统供电。在RFID系统中,低沉降时间是有效获取直流电压的关键。稳定时间定义为整流器在给定负载条件下达到最大稳定直流电压所需的时间。这项工作的主要重点是减少整流器所需的沉淀时间。由于晶体管的阈值电压,稳定时间是整流器的性能限制之一。在这项工作中,我们提出在RF到DC整流器的设计中使用DTMOS(动态阈值MOSFET)架构。在DTMOS中,栅极和本体捆绑在一起,可以动态改变阈值电压以适应电路的工作状态。我们在基于自v消(SVC)方案的整流器中实现了DTMOS架构。沉降时间作为性能参数。结果表明,与传统基于BTMOS(本体端与源端相连)结构的SVC整流器相比,改进后的SVC整流器的稳定时间小于50%。采用180nm标准CMOS技术实现了整流器,并利用光谱模拟器进行了仿真。
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引用次数: 7
Active on-chip voltage regulator based on second generation current conveyor 基于第二代电流输送装置的有源片上稳压器
E. Ashenafi, M. Chowdhury
Voltage regulators are used to provide a stable power supply to the microprocessor. The conventional off-chip switching voltage regulator comprises of a passive floating inductor, which is difficult to be implemented inside the chip due to excessive power dissipation and parasitic effects. Additionally, the inductor takes very large chip area hampering the scaling down process. These limitations make passive inductor based on-chip regulator very unattractive for system-on-a-chip (SOC) and multi-/many-core environments. To facilitate complete on-chip integration of a voltage regulator this paper presents an active circuit technique to replace the passive inductor and emulate the inductive behavior required in a buck convertor. The proposed scheme combines a linear and a switching voltage regulator together in single active circuit. The amalgamation of the two regulators will obviate the need to use a physical inductor, instead utilize a second-generation current conveyor based active filter along with an inverter switch and a voltage follower current source. Design of the circuit is demonstrated using 0.5μm technology on Cadence Virtuoso tools. Simulation results and MATLAB plots are provided to verify the proposed design.
电压调节器用于为微处理器提供稳定的电源。传统的片外开关稳压器由无源浮动电感组成,由于功耗过大和寄生效应,难以在芯片内实现。此外,电感占用非常大的芯片面积,阻碍了缩小过程。这些限制使得基于无源电感的片上稳压器对于片上系统(SOC)和多核/多核环境非常没有吸引力。为了实现稳压器的完全片上集成,本文提出了一种有源电路技术来取代无源电感并模拟降压变换器所需的电感行为。该方案在单个有源电路中结合了一个线性电压调节器和一个开关电压调节器。两个调节器的合并将避免使用物理电感器的需要,而是利用基于第二代电流输送的有源滤波器以及逆变器开关和电压跟随器电流源。在Cadence Virtuoso工具上使用0.5μm技术演示了电路的设计。仿真结果和MATLAB图验证了所提出的设计。
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引用次数: 1
Underlap engineered eight-transistor SRAM cell for stronger data stability enhanced write ability and suppressed leakage power consumption 叠层设计的8晶体管SRAM单元具有更强的数据稳定性,增强了写入能力并抑制了泄漏功耗
S. Salahuddin, V. Kursun
The degraded data stability, write ability, and increased leakage power consumption of static random-access memory (SRAM) cells have become primary design concerns with CMOS technology scaling into the sub-22nm channel lengths. A new gate-underlap-engineered eight-transistor SRAM cell is proposed in this paper for stronger data stability, enhanced write ability, and suppressed leakage power consumption in FinFET memory circuits. Gate-underlap lengths of the pull-up and pull-down transistors in cross-coupled inverters of the proposed SRAM cell are elongated and tuned for providing superior electrical characteristics in FinFET memory circuits. With the proposed gate-underlap engineered eight-FinFET SRAM cell, the read static noise margin is enhanced by up to 71.1%, the write voltage margin is increased by up to 29.7%, and the leakage power consumption is reduced by up to 91.8% while maintaining similar layout area as compared to the conventional eight-FinFET SRAM cells in a 15nm FinFET technology.
静态随机存取存储器(SRAM)单元的数据稳定性下降,写入能力下降,泄漏功耗增加,已成为CMOS技术扩展到22nm以下通道长度的主要设计问题。本文提出了一种新型栅极下盖设计的八晶体管SRAM单元,该单元在FinFET存储电路中具有更强的数据稳定性、更强的写入能力和更低的泄漏功耗。所提出的SRAM单元的交叉耦合逆变器中的上拉和下拉晶体管的栅极下接长度被拉长和调整,以便在FinFET存储电路中提供优越的电气特性。与15nm FinFET技术中传统的8 -FinFET SRAM单元相比,采用栅极下迭设计的8 -FinFET SRAM单元,读取静态噪声裕度提高了71.1%,写入电压裕度提高了29.7%,泄漏功耗降低了91.8%,同时保持了相似的布局面积。
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引用次数: 1
An RNS modular multiplication algorithm 一种RNS模乘法算法
D. Schinianakis, T. Stouraitis
An RNS implementation of Barrett's modular multiplication algorithm is presented in this paper. Existing algorithms for RNS modular multiplication employ Montgomery's technique. An algorithmic comparison with such state-of-the-art solutions shows that the proposed algorithm may reduce the total number of modular multiplications per RNS modular multiplication by 33%-50%.
本文提出了Barrett模乘法算法的RNS实现。现有的RNS模乘法算法采用了Montgomery的技术。与这些最先进的解决方案的算法比较表明,所提出的算法可以将每个RNS模块乘法的模块乘法总数减少33%-50%。
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引用次数: 8
An improved switching and reset architecture for linear phase recursive filters 一种改进的线性相位递归滤波器的开关和复位结构
F. Hassan, S. Khorbotly
A family of recursive exponential linear phase FIR filters was proposed in a previous work. The switching and reset method was subsequently used to create a stable implementation of an otherwise unstable pole-zero cancelation in those filters. In this work, we propose an improved switching and reset architecture that delivers the same results at a reduced hardware cost. The main advantage of this architecture lies in its ability to implement an exponential filter, of an arbitrary order N using only six adders, four multipliers, four multiplexers, and N +3 registers. Various order Exponential filters are synthesized on FPGA devices in both the improved and the traditional architectures. The results show that the improved architecture provides significant savings in both logic elements and register count, especially for higher values of N. Simulation results show that the impulse and step responses of the presented implementation accurately approximate the responses of a traditional, non-recursive exponential filter.
在前人的研究中,提出了一类递归指数线性相位FIR滤波器。切换和复位方法随后被用来创建一个稳定的实现,否则不稳定的极点零抵消在这些滤波器。在这项工作中,我们提出了一种改进的开关和重置架构,以降低硬件成本提供相同的结果。该架构的主要优点在于它能够实现任意阶N的指数滤波器,仅使用6个加法器、4个乘法器、4个多路复用器和N +3个寄存器。在改进的和传统的两种架构下,在FPGA器件上合成了各种阶指数滤波器。结果表明,改进后的结构大大节省了逻辑元件和寄存器计数,特别是对于较高的n值,仿真结果表明,所提出的实现的脉冲和阶跃响应准确地近似于传统的非递归指数滤波器的响应。
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引用次数: 2
Efficient non-coherent detection techniques for broadband cooperative networks 宽带合作网络的高效非相干检测技术
Sara Al Maeeni, S. Muhaidat, I. Abualhaol
Research on non-coherent detection for cooperative communications is at an early stage and many fundamental problems are still open. We will be working on an important open problems in broadband cooperative wireless communications. A novel non-coherent detection scheme for a multi-relay cooperative orthogonal frequency division multiplexing (OFDM) wireless system is investigated. We consider a distributed space-time block code (STBC) system over time-varying fading channels, in which source-relay, relay-destination, and source-destination links experience different Doppler spreads. Simulation results demonstrate that the recursive decoder achieves sufficient results even under quasi-static fading assumption.
合作通信的非相干检测研究尚处于早期阶段,许多基本问题仍未解决。我们将致力于解决宽带合作无线通信中的一个重要开放问题。我们研究了多中继合作正交频分复用(OFDM)无线系统的新型非相干检测方案。我们考虑了时变衰落信道上的分布式时空块编码(STBC)系统,其中信源-中继、中继-目的地和信源-目的地链路经历不同的多普勒扩散。仿真结果表明,即使在准静态衰落假设下,递归解码器也能取得足够的结果。
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引用次数: 0
Attitude control of quad-rotor UAVs using an intuitive kinematics model 基于直观运动学模型的四旋翼无人机姿态控制
D. Gan, G. Cai, J. Dias, L. Seneviratne
This paper presents the work on attitude control of quad-rotor UAVs applying an intuitive kinematics representation, called rotation vector. There are three elements in the rotation vector which has clear physical meaning of the rotations and avoids the singularity problem of Euler angles and the unity norm constraint problem of quaternions. Basic definition of the rotation vector and its relation with the object body angle velocity is introduced and used in the 6DOF quadrotor dynamics. Based on the property that the rotation vector rate is equivalent to the body angle velocity when the rotation is small, a simple and intuitive attitude reference is proposed. A proportional-derivative (PD) law is used by integrating the new attitude reference for the attitude control of quad-rotor UAVs. Simulation results prove the efficiency of the new method which provides a new model with intuitive physical meaning for quadrotor UAVs.
本文采用一种直观的运动学表示方法——旋转矢量,对四旋翼无人机的姿态控制进行了研究。旋转矢量中有三个元素,具有明确的旋转物理意义,避免了欧拉角的奇异性问题和四元数的统一范数约束问题。介绍了旋转矢量的基本定义及其与物体角速度的关系,并将其应用于六自由度四旋翼动力学。基于小旋转时旋转矢量速率等于体角速度的特性,提出了一种简单直观的姿态参考。通过对新姿态参考进行积分,采用比例导数法对四旋翼无人机进行姿态控制。仿真结果证明了该方法的有效性,为四旋翼无人机提供了一个具有直观物理意义的新模型。
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引用次数: 2
On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation 伪随机数生成的全数字混沌振荡器的短期可预测性
A. Radwan, A. S. Mansingka, Mohammed Affan Zidan, K. Salama
This paper presents a digital implementation of a 3rd order chaotic system using the Euler approximation. Short-term predictability is studied in relation to system precision, Euler step size and attractor size and optimal parameters for maximum performance are derived. Defective bits from the native chaotic output are neglected and the remaining pass the NIST SP. 800-22 tests without post-processing. The resulting optimized pseudorandom number generator has throughput up to 17.60 Gbits/s for a 64-bit design experimentally verified on a Xilinx Virtex 4 FPGA with logic utilization less than 1.85%.
本文利用欧拉近似给出了一个三阶混沌系统的数字实现。研究了短期可预测性与系统精度的关系,导出了欧拉步长、吸引子大小和性能最大化的最优参数。原生混沌输出中的缺陷位被忽略,剩余的通过NIST SP. 800-22测试,无需后处理。在Xilinx Virtex 4 FPGA上进行了实验验证,得到的64位伪随机数生成器吞吐量高达17.60 Gbits/s,逻辑利用率低于1.85%。
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引用次数: 3
期刊
2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS)
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