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2016 IEEE 7th Latin American Symposium on Circuits & Systems (LASCAS)最新文献

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Memory access profiling for HEVC encoders 内存访问剖析HEVC编码器
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451055
Ana Mativi, Eduarda Monteiro, S. Bampi
In this work we present a framework that profiles HEVC (High Efficiency Video Coding) encoders modules focusing on cache memory performance and energy. This framework considers the HEVC reference software (HM) and analyzes the impact of some coding parameters on the cache hierarchy. HEVC was proposed in 2013, presenting new video coding techniques to deal with the demand for higher resolutions. The tools included in the HEVC increase significantly the computational effort and energy consumption required to encode videos when compared to its predecessor, H.264/AVC. For this analysis we used the proposed framework MAP-HEVC (Memory Access Profiling for HEVC) considering seven different video coding configurations and four video resolutions. In the prediction module, the results showed that using Full Search (FS) results in 75% more accesses than using Test Zonal (TZ) Search. The results also suggest that using 16×16 search ranges is a very viable option to reduce the memory accesses achieving a better compression. For the residual coding, the Rate-Distortion Optimized Quantization (RDOQ) was evaluated and our analysis showed that this tool adds 10% more accesses to the memory.
在这项工作中,我们提出了一个框架,介绍了HEVC(高效视频编码)编码器模块,重点关注缓存内存性能和能量。该框架考虑了HEVC参考软件(HM),分析了一些编码参数对缓存层次结构的影响。HEVC于2013年提出,提出了新的视频编码技术来满足更高分辨率的需求。与之前的H.264/AVC相比,HEVC中包含的工具显著增加了编码视频所需的计算量和能耗。在这个分析中,我们使用了提出的框架MAP-HEVC(内存访问分析HEVC),考虑了七种不同的视频编码配置和四种视频分辨率。在预测模块中,结果表明,使用Full Search (FS)的访问次数比使用Test Zonal Search (TZ)的访问次数多75%。结果还表明,使用16×16搜索范围是一个非常可行的选择,可以减少内存访问,从而实现更好的压缩。对于剩余编码,评估了率失真优化量化(RDOQ),我们的分析表明,该工具增加了10%的内存访问。
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引用次数: 6
A high-slope PTAT temperature sensor for frequency compensation of an RTC oscillator 一种用于RTC振荡器频率补偿的高斜率PTAT温度传感器
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451022
Sergio Chaparro, J. Carrillo, H. Alarcon
A temperature sensor used to compensate the crystal oscillator frequency instability of a real time clock (RTC) is proposed in this paper. The sensor utilizes the difference of a current proportional to the absolute temperature (PTAT) and another complementary to the absolute temperature (CTAT), generating a high-slope PTAT voltage with minimum value close to zero. The introduced approach provides a voltage signal range that reduces the power and area consumption of a 7-bit successive approximation analog-to-digital converter (SAR-ADC). The principles of the circuit topology alongside the simulation results of corners and Monte Carlo analyzes are presented. A prototype is fabricated in a 0.18 μm CMOS technology and experimental results showed a temperature inaccuracy of -0.812 to 0.266 °C, with an average resolution of 18.01 mV/°C, using a one-point calibration within the range of 0 to 40 °C. The sensor features an area of 0.08 mm2 and consumes less than 73.8 μW from a 1.8 V voltage supply.
提出了一种用于补偿实时时钟晶体振荡器频率不稳定性的温度传感器。该传感器利用与绝对温度(PTAT)成比例的电流和与绝对温度(CTAT)互补的电流之差,产生最小值接近于零的高斜率PTAT电压。所介绍的方法提供了一个电压信号范围,降低了7位连续近似模数转换器(SAR-ADC)的功率和面积消耗。给出了电路拓扑的基本原理,并给出了角点的仿真结果和蒙特卡罗分析。实验结果表明,在0 ~ 40℃范围内采用单点校准,温度误差为-0.812 ~ 0.266°C,平均分辨率为18.01 mV/°C。该传感器的面积为0.08 mm2,在1.8 V电压下功耗小于73.8 μW。
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引用次数: 0
Real-time CPU-GPU demodulator for the LTE physical layer LTE物理层的实时CPU-GPU解调器
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451033
Ouajdi Brini, M. Boukadoum
Since the emergence of large public networks in the 80's, wireless communication protocols have been evolving constantly, forcing frequent changes to the hardware of base stations. This has triggered a lot of research about implementing network functions in software, especially those of the physical layer, in order to allow the use of generic processors in the base stations. However, achieving this goal requires very fast hardware to maintain real time operation. In this work, we describe a hardware system that combines a desktop CPU with a GPU for real time frame demodulation in the LTE protocol physical layer. Our experiments with worst-case LTE frames show that the making of a software-based LTE frame processor that operates in real time is possible with general-purpose hardware architectures such as the one described, thus opening the door for upscaling to complete base stations.
自20世纪80年代大型公共网络出现以来,无线通信协议不断发展,迫使基站硬件频繁变化。这引发了大量关于在软件中实现网络功能的研究,特别是物理层的研究,以便允许在基站中使用通用处理器。然而,实现这一目标需要非常快的硬件来维持实时操作。在这项工作中,我们描述了一个硬件系统,它结合了桌面CPU和GPU,用于LTE协议物理层的实时帧解调。我们对最坏情况下的LTE帧进行的实验表明,使用通用硬件架构(如所描述的硬件架构)制造实时运行的基于软件的LTE帧处理器是可能的,从而为升级到完整的基站打开了大门。
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引用次数: 3
Characterization of transmission lines in a novel high-frequency laminate 新型高频层压板中传输线的特性
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451092
A. Perez-Fajardo, D. M. Cortés-Hernández, R. Torres‐Torres, A. Torres-Jácome
In this work a method for characterization of transmission line (TL) in high-frequency laminates is proposed. The method is performed in a novel PCB laminate based in PTFE for high-frequency applications with low conductor roughness (hrms) and low loss tangent (tanδ). In order to apply the characterization method, S-parameters were taken up to 30 GHz in a microstrip interconnect. Time domain simulation was performed to validate the model, showing good agreement with experimental results.
本文提出了一种高频层压板中传输线(TL)的表征方法。该方法在基于聚四氟乙烯的新型PCB层压板中进行,用于低导体粗糙度(hrms)和低损耗正切(tanδ)的高频应用。为了应用表征方法,在微带互连中,s参数高达30 GHz。通过时域仿真对模型进行了验证,与实验结果吻合较好。
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引用次数: 0
Effects of nanoelectroporation on plasma and nuclear membranes 纳米电穿孔对等离子体和核膜的影响
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451082
L. S. Pereira, D. Suzuki
This article aims to analyze the pore formation in the plasma and nuclear membranes of a single biological cell during the electroporation process. For this purpose, were studied mathematical models of electroporation and electrical pulse characteristics, in order to analyze the influence of variations in the amplitude and duration. Thus, it seeks to obtain configurations that provide better results and less damage to the structure of the cell membrane during the electroporation process.
本文旨在分析单个生物细胞在电穿孔过程中质膜和核膜上的孔形成。为此,研究了电穿孔的数学模型和电脉冲特性,以分析变化幅度和持续时间的影响。因此,它寻求在电穿孔过程中获得提供更好结果和更少对细胞膜结构破坏的配置。
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引用次数: 0
Exploiting architectural solutions for IIR filter architecture with truncation error feedback 开发具有截断误差反馈的IIR滤波器体系结构解决方案
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451088
Gustavo Ott, E. Costa, S. Almeida, M. Fonseca
Digital filters are widely used in digital systems, which can make use of integer arithmetic to achieve higher performance. The use of integer operands can compromise the filter operation, due to the inherently error caused by truncation operations. Addressing this kind of problem, we propose an IIR filter for biomedical signals using the truncation error feedback (TEF), in which a feedback signal is obtained from the division remainder of the truncation operation. Two dedicated fully-sequential and parallel architectures were implemented and simulated using VHDL language, and synthesized in Cadence environment using the 45 nm Nangate Open Cell Library. A simulated ECG signal was used as input to verify the functionality of an IIR high pass filter with TEF. The results of our analysis indicate that the use of TEF can be an important approach in digital systems, where integer arithmetic for computation is adequate for performance requirements. Using this feedback signal, the design specifications of the filter remained significantly the same compared to the filter specification, independently of the cut-off and sample frequency ratio.
数字滤波器广泛应用于数字系统中,它可以利用整数运算来获得更高的性能。整数操作数的使用可能会影响过滤器操作,因为截断操作会导致固有的错误。针对这类问题,我们提出了一种使用截断误差反馈(TEF)的生物医学信号IIR滤波器,其中从截断运算的除法余数中获得反馈信号。采用VHDL语言实现和模拟了两个专用的全顺序和并行架构,并在Cadence环境下使用45 nm的Nangate Open Cell Library进行了合成。采用模拟心电信号作为输入,验证了带TEF的IIR高通滤波器的功能。我们的分析结果表明,在数字系统中,使用TEF可以是一种重要的方法,其中用于计算的整数算法足以满足性能要求。使用该反馈信号,与截止频率和采样频率比无关,滤波器的设计规格与滤波器规格保持明显相同。
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引用次数: 2
Design of optimized radix-2 and radix-4 butterflies from FFT with decimation in time 基于FFT实时抽取优化的基数2和基数4蝴蝶的设计
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451037
Renato H. Neuenfeld, M. Fonseca, E. Costa
In the FFT computation, the butterflies play a central role, since they allow calculation of complex terms. In this calculation, involving multiplications of input data with appropriate coefficients, the optimization of the butterfly can contribute for the reduction of power consumption of FFT architectures. In this paper different and dedicated structures for the 16 bit-width radix-2 and radix-4 DIT butterflies are implemented, where the main goal is to minimize the number of arithmetic operators in order to produce power-efficient structures. Firstly, we improve a radix-2 butterfly previously presented in literature, reducing one adder and one subtractor in the structure. After that, part of this optimized radix-2 butterfly is used to reduce the number of real multipliers in the radix-4 butterfly. The main results show that the optimization guarantees reduced power consumption for radix-2 butterfly, when compared with previous works from the literature. Moreover, the use of part of the optimized radix-2 into the radix-4 structure leads to the reduction of power consumption for this structure.
在FFT计算中,蝴蝶扮演着核心角色,因为它们允许计算复杂的项。在这个计算中,涉及到输入数据与适当系数的乘法,蝴蝶的优化可以有助于降低FFT架构的功耗。在本文中,为16位宽度的基数-2和基数-4 DIT蝴蝶实现了不同的专用结构,其主要目标是最小化算术运算符的数量,以产生节能的结构。首先,我们改进了先前文献中提出的一个基数-2蝴蝶,减少了结构中的一个加法器和一个减法器。之后,使用优化后的基数-2蝴蝶的一部分来减少基数-4蝴蝶中实乘子的数量。主要结果表明,与先前的文献相比,优化保证了基数2蝴蝶的功耗降低。此外,将部分优化的基数-2应用到基数-4结构中,可以降低该结构的功耗。
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引用次数: 23
Topological characteristics of logic networks generated by a graph-based methodology 基于图的方法生成逻辑网络的拓扑特征
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451080
M. Cardoso, Regis Zanandrea, R. S. Souza, Joao J. S. Machado, L. Rosa, F. Marques
Graph-based methodologies for supergate design have gained relevance recently. Due to the non-series-parallel arrangements and the transistor sharing technique, these methodologies can deliver a network with fewer transistors, leading to an efficient logic design. However, through its optimization processes, these methods introduces some topology particularities in the logic network, which impacts directly in the layout. This paper presents a methodology to identify these aspects in order to guide the cell layout generation. The results were performed over a set of intensively used benchmarks and pointed that 67.69% of the investigated networks presents a planar topology, while 21.85% shows a different number of transistors between its logic plans and 93.73% of the physical cells will contain at least one gap in its diffusion areas.
最近,基于图的方法在超级闸门设计中得到了应用。由于非串并联排列和晶体管共享技术,这些方法可以提供具有更少晶体管的网络,从而实现高效的逻辑设计。然而,这些方法在优化过程中引入了逻辑网络的一些拓扑特性,直接影响了布局。本文提出了一种方法来识别这些方面,以指导单元格布局的生成。结果表明,67.69%的网络呈现平面拓扑,21.85%的网络在其逻辑规划之间显示出不同数量的晶体管,93.73%的物理单元在其扩散区域至少包含一个间隙。
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引用次数: 5
Parallel algorithm mapping to memory multidimensional signals 内存多维信号的并行映射算法
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451068
F. Balasa, I. Luican, Hongwei Zhu
The signal processing algorithms are typically described in a high-level programming language. In data-dominated applications, particularly in the multimedia and telecommunication domains, the code of these behavioral specifications is organized in sequences of loop nests; the main data structures are multidimensional arrays. This paper proposes a memory management algorithm for mapping multidimensional signals (arrays) to the physical memories. The proposed technique is well-suited to a dynamic multithreading implementation, which makes it computationally efficient. Another advantage is that it can be applied to multi-layer memory hierarchies, which makes it particularly useful in embedded systems design.
信号处理算法通常用高级编程语言描述。在数据主导的应用中,特别是在多媒体和电信领域,这些行为规范的代码被组织在循环巢序列中;主要的数据结构是多维数组。本文提出了一种将多维信号(阵列)映射到物理存储器的内存管理算法。所提出的技术非常适合于动态多线程实现,这使得它的计算效率很高。另一个优点是它可以应用于多层内存层次结构,这使得它在嵌入式系统设计中特别有用。
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引用次数: 0
Performance evaluation of optimized transistor networks built using independent-gate FinFET 使用独立栅极FinFET构建的优化晶体管网络的性能评估
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451051
Andres M. A. Valdes, V. Possani, F. Marranghello, A. Reis, R. Ribas
MOS planar technology has been used in fabrication of integrated circuits in the last decades. However, the short channel effects in the subthreshold operation region are becoming a critical restriction to the channel length reduction. With the use of FinFET devices, the scaling increases due the reduction of short channel effects. FinFET offers the possibility of independent gate controlling that can be efficiently exploited in logic reduction (network optimization), but with direct impact in the electrical performance of logic gates. In this work, it is presented the electrical analysis in terms of signal delay propagation and energy consumption of compacted transistor networks. Different logic gate implementations corresponding to the same Boolean function behavior are compared. The results demonstrate the existing tradeoff between these two parameters.
近几十年来,MOS平面技术已广泛应用于集成电路的制造。然而,阈下操作区域的短信道效应正成为信道长度减小的关键制约因素。随着FinFET器件的使用,由于短通道效应的减少,标度增加。FinFET提供了独立门控制的可能性,可以有效地用于逻辑简化(网络优化),但直接影响逻辑门的电气性能。本文从信号延迟传播和能量消耗的角度对晶体管网络进行了电学分析。比较了对应于相同布尔函数行为的不同逻辑门实现。结果表明这两个参数之间存在权衡。
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引用次数: 1
期刊
2016 IEEE 7th Latin American Symposium on Circuits & Systems (LASCAS)
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