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

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Self-biased class AB CMOS current buffer 自偏置AB类CMOS电流缓冲器
Pub Date : 2016-04-14 DOI: 10.1109/LASCAS.2016.7451058
J. Nieto, M. T. Sanz, N. Medrano-Marqués, B. Calvo
A self-biased current buffer based on the quasi floating gate (QFG) approach to achieve class AB operation is presented in this paper. It was designed in standard 0.18μm CMOS process with 1.8V power supply. The buffer is able to copy an input current range of ±15μA with 8μA bias current. The total harmonic distortion (THD) remains below -84dB for 1 kHz frequency and maximum input current Ipp = 30pA. A comparison with two other class AB architectures in terms of input and output impedances, THD, bandwidth, accuracy and static and dynamic power consumption is also presented.
提出了一种基于准浮门(QFG)的自偏置电流缓冲器,可实现AB类运算。采用标准0.18μm CMOS工艺设计,电源为1.8V。该缓冲器能够以8μA的偏置电流复制±15μA的输入电流范围。当频率为1khz,最大输入电流Ipp = 30pA时,总谐波失真(THD)保持在-84dB以下。在输入和输出阻抗、THD、带宽、精度、静态和动态功耗等方面与其他两种AB类架构进行了比较。
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引用次数: 7
Optimizing cell area by applying an alternative transistor folding technique in an open source physical synthesis CAD tool 通过在开源物理合成CAD工具中应用替代晶体管折叠技术来优化单元面积
Pub Date : 2016-04-14 DOI: 10.1109/LASCAS.2016.7451083
G. Smaniotto, Joao J. S. Machado, Matheus T. Moreira, A. Ziesemer, F. Marques, L. Rosa
Traditional synthesis flows dedicated to design ASICs typically adopt standard cells approach to generate VLSI circuits. As a consequence, the layouts of these circuits are not fully optimized due to the restricted number of cells present in the library. To solve this problem, ASTRAN, an open source automatic synthesis tool, was developed. This tool generates layouts with unrestricted cell structures and obtains results with similar density compared to state-of-the-art alternatives. A key step on the ASTRAN flow is the transistor folding, which consists in breaking the transistors that exceed the height limit defined in the project rules. This step is executed in ASTRAN only into single transistors. This paper addresses this issue and introduces a new folding methodology that identifies all stacks of transistors series and applies the folding technique for each of these arrangements. The results obtained through this new folding technique show reductions in cell area.
专用于设计asic的传统合成流程通常采用标准单元方法生成VLSI电路。因此,由于库中存在的单元数量有限,这些电路的布局没有得到充分优化。为了解决这个问题,开发了开源自动合成工具ASTRAN。该工具生成不受限制的单元结构布局,并获得与最先进的替代方案相似的密度结果。ASTRAN流程的一个关键步骤是晶体管折叠,这包括打破超过项目规则中定义的高度限制的晶体管。该步骤在ASTRAN中仅在单晶体管中执行。本文解决了这一问题,并介绍了一种新的折叠方法,该方法可以识别所有晶体管系列堆叠,并将折叠技术应用于每种排列。通过这种新的折叠技术获得的结果显示细胞面积减少。
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引用次数: 0
A low-cost microcontrolled dosimeter based on CD4007 devices for in vivo radiotherapy applications 一种基于CD4007器件的低成本微控制剂量计,可用于体内放疗
Pub Date : 2016-04-14 DOI: 10.1109/LASCAS.2016.7451061
O. F. Siebel, C. Saraiva, F. J. Ramirez-Fernandez, M. C. Schneider, C. Galup-Montoro
This work presents a low-cost microcontrolled dosimeter based on CD4007 device, a popular off-the-shelf CMOS circuit. This dosimeter is aimed at in vivo radiotherapy applications and combines a simple and accurate readout with a small size, low-cost, and cable-free sensor. The response of this dosimeter to low-dose (10 cGy-1 Gy) and 40 Gy irradiations were tested using X-ray (6 MV).
本文提出了一种基于CD4007器件的低成本微控制剂量计,这是一种流行的现成CMOS电路。该剂量计旨在体内放疗应用,并结合了简单准确的读数和小尺寸,低成本和无电缆的传感器。用x射线(6 MV)测试了该剂量计对低剂量(10 cGy-1 Gy)和40 Gy辐照的响应。
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引用次数: 1
Area-delay-power-aware adder placement method for RNS reverse converter design RNS反向变换器设计中的区域延迟-功率感知加法器放置方法
Pub Date : 2016-04-14 DOI: 10.1109/LASCAS.2016.7451050
Azadeh Alsadat Emrani Zarandi, A. S. Molahosseini, L. Sousa, M. Hosseinzadeh, K. Navi
Residue number systems (RNS) are an attractive alternative to conventional weighted number systems for nowadays applications, due to features such as parallelism and low-power consumption. However, a prerequisite for benefiting from these features is to have a suitable design for reverse converters. This paper proposes a practical adder placement method to achieve reverse converters with the desired characteristics based on the target application's requirements and constraints. The presented area-delay-power-aware adder placement method breaks down into four phases. Besides, a linear efficiency function specified for RNS is introduced to choose design with the best trade-off between circuit parameters. The effectiveness of the proposed placement method is experimentally assessed.
由于具有并行性和低功耗等特点,剩余数系统(RNS)在当今的应用中是传统加权数系统的一个有吸引力的替代方案。然而,从这些特性中受益的先决条件是有一个合适的反向转换器设计。本文根据目标应用的要求和约束条件,提出了一种实用的加法器放置方法,以实现具有期望特性的逆变器。提出的区域延迟-功率感知加法器放置方法分为四个阶段。此外,还引入了RNS的线性效率函数来选择电路参数之间的最佳权衡。实验验证了该方法的有效性。
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引用次数: 1
Cell-culture measurements using voltage oscillations 使用电压振荡的细胞培养测量
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451053
A. Maldonado, G. Huertas, A. Rueda, J. Huertas, P. Pérez, A. Yúfera
A comprehensive system for real-time monitoring of a set of cell-cultures using a Voltage Oscillation (VO) methodology is proposed. The main idea is to connect the bio-electrical elements (electrodes & cell-culture) in such a way that sequentially a suitable electrical oscillator, which only uses a DC power source, is built. Using the employed electrical models given in [1, 2], the attained oscillation parameters (frequency and amplitude) can be directly related to the biological test. A digital circuitry is developed to pick-up the experimental measurements, which are gathered and shown in real-time in a web application.
提出了一种利用电压振荡(VO)方法对一组细胞培养物进行实时监测的综合系统。主要思想是连接生物电气元件(电极和细胞培养),以这样一种方式,依次建立一个合适的电子振荡器,它只使用直流电源。使用[1,2]中给出的电模型,获得的振荡参数(频率和幅度)可以直接与生物试验相关。开发了一种数字电路来采集实验测量值,这些测量值被收集并在网络应用程序中实时显示。
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引用次数: 3
A new methodology for design and simulation of NML circuits 一种新的NML电路设计与仿真方法
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451059
T. R. B. S. Soares, I. F. Silva, L. Melo, O. V. Neto
Field-Coupled nanocomputing alternatives are promising technologies that can outcome the size/energy limitations of CMOS transistors. Nanomagnet Logic (NML) technology is one of their variations, which incorporates processing and memory using single-domain nanomagnets, operating at room temperature with low energy dissipation. While simple NML logic circuits have been experimentally demonstrated recently, considerable less work has been done on the design and simulation of more complex NML circuits. In this paper, we present a tool for the design and simulation of NML circuits, in which the designer is allowed to manually place the magnets in a grid to construct a desired NML circuit. The outputs from the circuit's logic gates are then calculated using a fast tri-state algorithm.
场耦合纳米计算替代方案是有前途的技术,可以解决CMOS晶体管的尺寸/能量限制。纳米磁体逻辑(NML)技术是其中的一种变化,它将处理和存储结合在一起,使用单畴纳米磁体,在室温下工作,能耗低。虽然简单的NML逻辑电路最近已经被实验证明,但在更复杂的NML电路的设计和仿真方面所做的工作相当少。在本文中,我们提出了一个用于NML电路设计和仿真的工具,在该工具中,设计人员可以手动将磁铁放置在网格中以构建所需的NML电路。然后使用快速三态算法计算电路逻辑门的输出。
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引用次数: 5
A CAD-oriented simulation methodology for memristive circuits 忆阻电路的cad仿真方法
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451020
A. Sarmiento-Reyes, Jesús Jiménez-León, L. Hernández-Martínez, H. Vázquez-Leal
With the fabrication of the nanometric memristor in 2008, a large number of applications in electronic design have been devised for the new device. Despite the current problems involved in its fabrication, the memristor is considered to be the basic circuit cell for the development of modern electronic systems. Unquestionably, it is necessary to develop circuit design verification methodologies and CAD tools for circuits containing memristors as well as traditional electronics. In this paper, we present a circuit simulation methodology for the electrical simulation of memristive circuits. The methodology results in a nonlinear constitutive branch relationship for the memristor that can be straightforwardly combined with models for traditional components in a standard industry package for electrical simulation.
随着2008年纳米忆阻器的问世,纳米忆阻器在电子设计中有了大量的应用。尽管目前在制造过程中还存在一些问题,但忆阻器被认为是现代电子系统发展的基本电路单元。毫无疑问,对于包含忆阻器的电路以及传统电子器件,开发电路设计验证方法和CAD工具是必要的。在本文中,我们提出了一种电路仿真方法,用于记忆电路的电气仿真。该方法得出了忆阻器的非线性本构分支关系,该关系可以直接与标准工业封装中的传统元件模型相结合,用于电气仿真。
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引用次数: 1
A method for quick estimation of optimum bulk bias voltages for SoC designs SoC设计中最佳体偏置电压的快速估计方法
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451054
Lucas Santis, Ronald Valenzuela
A method for early estimation of optimum bulk bias potential is proposed. The suggested strategy removes the requirement for synthesis based exploration, greatly reducing Turn Around Time (TAT). As the core of the method, we present a linear model for estimating the Energy Delay Product (EDP), which relies on characterization of Static and Dynamic Energy, as well as Delay for a single Inverter cell under different bulk bias operating conditions. This model weights these vectors using design constraint parameters such as switching activity and clock period. We have validated the model by means of statistical analysis. The method was then tested by comparison of Quality of Results (QoR) obtained from implementation of an open source System on a Chip (SoC) design, first using our predicted bias voltages and then using an estimate of the optimum found by exploration over a post layout annotated Netlist. Our method has achieved a 6.3% of improvement on EDP with a very low TAT.
提出了一种早期估计最佳体偏置电位的方法。建议的策略消除了基于综合的勘探需求,大大减少了周转时间(TAT)。作为该方法的核心,我们提出了一个估计能量延迟积(EDP)的线性模型,该模型依赖于静态和动态能量的表征,以及不同体偏置工作条件下单个逆变器电池的延迟。该模型使用设计约束参数(如切换活动和时钟周期)对这些向量进行加权。我们用统计分析的方法对模型进行了验证。然后,通过比较从开源芯片上系统(SoC)设计实现中获得的结果质量(QoR)来测试该方法,首先使用我们预测的偏置电压,然后使用通过探索post布局注释Netlist发现的最佳估计。我们的方法在非常低的TAT下实现了6.3%的EDP改进。
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引用次数: 0
Exploiting adder compressors for power-efficient 2-D approximate DCT realization 利用加法器压缩器实现节能的二维近似DCT
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451090
Tiago Schiavon, Guilherme Paim, M. Fonseca, E. Costa, S. Almeida
This paper proposes the use of efficient adder compressors for the power-efficient 2-D Discrete Cosine Transform (DCT) implementation. Due to the increasing use of the discrete transforms in image compression, and its dedicated hardware design, the search for efficient and fast approaches to the DCTs reached a special place in the state-of-art researches. The DCT is an approximation of the cosine function, whose resultant matrix is only composed of 0 and 1 values. Therefore, the DCT can be easily implemented using only adders and subtractors rather than general purpose multipliers. In this work we use combinations of efficient 4-2 and 8-2 adder compressors for the state-of-the approximate DCT implementations. The approximate DCT performance combined with its lower computational effort makes this transform an excellent choice to be applied to dedicated hardware for image compression. We present an environment for the synthesis of the DCTs in Cadence Encounter RTL Compiler tool. The synthesis reports are based on a set of true images as input vectors in order to obtain valid power results. The results show that the hardwired state-of-the-art approximate DCT solutions, with adder compressors, minimizes both cells area and power consumption with good overall quality images.
本文提出使用高效加法器压缩器实现高能效的二维离散余弦变换(DCT)。由于离散变换在图像压缩中的应用越来越广泛,以及其专用的硬件设计,寻找高效快速的离散变换方法在目前的研究中占有特殊的地位。DCT是余弦函数的近似值,其结果矩阵仅由0和1值组成。因此,DCT可以很容易地只使用加法器和减法器而不是通用乘法器来实现。在这项工作中,我们使用高效的4-2和8-2加法器压缩器的组合来实现近似DCT的状态。近似的DCT性能加上较低的计算量使该变换成为应用于图像压缩专用硬件的绝佳选择。我们在Cadence Encounter RTL编译器工具中提供了一个dct的合成环境。合成报告是基于一组真实图像作为输入向量,以获得有效的功率结果。结果表明,使用加法器压缩器的硬连线最先进的近似DCT解决方案可以最大限度地减少单元面积和功耗,同时获得良好的整体图像质量。
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引用次数: 11
A low-jitter digital-to-time converter with look-ahead multi-phase DDS 具有超前多相DDS的低抖动数字时间转换器
Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451049
Harishankar Sahu, Pallavi Paliwal, Vivek Yadav, Shalabh Gupta
We propose a multi-phase Direct Digital Synthesizer (DDS) based Digital to Time Converter (DTC), for application in fractional-N Digital Phase Locked Loops (DPLLs). The proposed DTC employs (i) multiple DDSs operating with incremental delay for reduced quantization step size, and (ii) a phase-advanced ROM in these DDSs for correct waveform extrapolation. The incrementally delayed output from multiple DDSs allows reduction in harmonics associated with the quantized steps, and the look-ahead feature of phase advanced ROM allows DTC operation even at the Nyquist rate. The DTC, designed in 65 nm CMOS-LL technology, achieves 1.2 ps jitter with 10 mW power consumption, while operating at 4.8 GHz input frequency. Also, the fractional-N DPLL employing the proposed multi-phase DDS based DTC in its feedback path is able to attain -341 dB as Figure of Merit, which is the best amongst the published results, with a very low settling time-jitter product.
我们提出了一种基于多相直接数字合成器(DDS)的数字时间转换器(DTC),用于分数n数字锁相环(dpll)。所提出的DTC采用(i)多个dds以增量延迟操作以减少量化步长,以及(ii)这些dds中的相位进阶ROM用于正确的波形外推。来自多个dds的增量延迟输出允许减少与量化步长相关的谐波,并且相位先进ROM的前瞻性特性甚至允许在奈奎斯特速率下进行DTC操作。DTC采用65nm CMOS-LL技术设计,在4.8 GHz输入频率下实现1.2 ps抖动,功耗为10 mW。此外,在其反馈路径中采用所提出的基于多相DDS的DTC的分数n DPLL能够获得-341 dB的优值,这在已发表的结果中是最好的,具有非常低的沉淀时间抖动产物。
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引用次数: 7
期刊
2016 IEEE 7th Latin American Symposium on Circuits & Systems (LASCAS)
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