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2011 20th European Conference on Circuit Theory and Design (ECCTD)最新文献

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A design methodology to enable sampling PLLs to synthesise fractional-N frequencies 一种使采样锁相环能够合成分数n频率的设计方法
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043359
Tao Xu, Xingyu Zhou, Linyong Shen, M. Condon
A novel design methodology is proposed to enable sampling phase-locked loops (SPLL) to synthesise fractional-N frequencies. To date, SPLL can only generate integer-N frequencies. The benefit is that the proposed SPLL has the advantages of both fractional-N PLL and SPLL, such as the faster frequency switching, a smaller phase jump and a larger loop gain. Since the frequency divider can be omitted in SPLL, the associated phase noise, power and hardware consumption can be ignored. Also, the design work is simplified, since the complex multi-phase frequency divider is not needed in the proposed SPLL.
提出了一种新颖的设计方法,使采样锁相环(SPLL)能够合成分数n频率。迄今为止,SPLL只能产生整数n频率。其优点是该SPLL具有分数n锁相环和SPLL的优点,如更快的频率切换,更小的相位跳变和更大的环路增益。由于分频器可以在SPLL中省略,相关的相位噪声、功率和硬件消耗可以忽略。此外,由于该SPLL不需要复杂的多相分频器,因此简化了设计工作。
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引用次数: 1
Decade bandwidth single and cascaded travelling wave medium power amplifiers using sige hbts 使用sights的十带宽单级和级联行波中功率放大器
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043833
M. Sayginer, M. Yazgi, A. Toker, H. Kuntman, B. Virdee
This paper presents two integrated class-A travelling wave medium power amplifiers employing 0.35µm SiGe HBT process. The first amplifier realized is a 1.3×1mm2 device comprising of a single-stage configuration using a single transistor that exhibits an average small-signal gain of 7dB and power level of 14dBm between 0.25 to 2.5GHz while maintaining power-added efficiency in the range 30% to 10%. The second amplifier is 1.8×2.3mm2 device comprising of a driver stage cascaded with two identical amplifier stages in a parallel configuration whose outputs are combined together to enhance the devices output power by 3dB across the wideband frequency range. This amplifier's unique topology is implemented using a version of the first amplifier. The amplifier's measured output power was approximately 18dBm, the average small-signal gain was 21dB, and efficiency between 30% to 10% across 0.2–2.2GHz.
本文介绍了两种采用0.35 μ m SiGe HBT工艺的集成a类行波中功率放大器。实现的第一个放大器是1.3×1mm2器件,由单级配置组成,使用单晶体管,在0.25至2.5GHz之间显示出7dB的平均小信号增益和14dBm的功率水平,同时保持30%至10%的功率附加效率。第二个放大器是1.8×2.3mm2装置,包括一个驱动器级联两个相同的并联配置的放大器级,其输出组合在一起,以在宽带频率范围内提高3dB的设备输出功率。该放大器的独特拓扑是使用第一个放大器的一个版本来实现的。放大器的测量输出功率约为18dBm,平均小信号增益为21dB,在0.2-2.2GHz范围内效率在30%至10%之间。
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引用次数: 1
Four-layer cellular neural networks in consideration of color and luminosity 考虑颜色和亮度的四层细胞神经网络
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043827
Yoshihiro Kato, Yasuhiro Ueda, Y. Uwate, Y. Nishio
Human's retina has the capability to identify color and luminosity. The cell identifies color is called a cone cell and identifies luminosity is called a rod cell. The color image processing using CNN was proposed by Roska et al. Additionally, Inoue et al. have used three-layer CNN based on cone cell, and performed edge enhancement. They have confirmed that edge had been detected under three-layer CNN influencing each other. However, the edge of a low luminosity portion is not detected. In this study, we propose four-layer cellular neural networks in consideration of three primary colors of light and luminosity, respectively. In this research, we show some edge detection results and confirm that the proposed CNN is effective compared with the conventional CNN and the existing CNN.
人类的视网膜有识别颜色和亮度的能力。识别颜色的细胞称为锥细胞,识别亮度的细胞称为杆状细胞。利用CNN对彩色图像进行处理是由Roska等人提出的。此外,Inoue等人使用了基于锥细胞的三层CNN,并进行了边缘增强。他们已经确认,在相互影响的三层CNN下发现了边缘。然而,没有检测到低光度部分的边缘。在这项研究中,我们提出了四层细胞神经网络,分别考虑光的三种原色和亮度。在本研究中,我们展示了一些边缘检测结果,并与传统的CNN和现有的CNN进行了比较,证实了所提出的CNN是有效的。
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引用次数: 1
Synthesis strategies for sub-VT systems 子vt系统的综合策略
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043593
P. Meinerzhagen, O. Andersson, Yasser Sherazi, A. Burg, J. Rodrigues
Various synthesis strategies relying on conventional standard-cell libraries (SCLs) are evaluated in order to minimize the energy dissipation per operation in sub-threshold (sub-VT) systems. First, two sub-VT analysis methods are reviewed, both of which allow to evaluate the energy dissipation and performance in the sub-VT regime for designs which have been synthesized using a 65-nm CMOS SCL, characterized at nominal supply voltage. Both analysis methods are able to predict the energy minimum supply voltage (EMV) of any given design. Next, the results of a sub-VT synthesis at EMV using re-characterized SCLs are compared to the initial synthesis results. Finally, the results of timing-driven synthesis in both the above-VT and the sub-VT domain are compared to the results of power-driven synthesis.
为了最大限度地减少亚阈值(sub-VT)系统中每次操作的能量消耗,评估了依赖于传统标准单元库(SCLs)的各种合成策略。首先,回顾了两种亚vt分析方法,这两种方法都可以评估使用65纳米CMOS SCL合成的设计在亚vt状态下的能量消耗和性能,表征为标称电源电压。这两种分析方法都能够预测任何给定设计的能量最小供电电压(EMV)。接下来,使用重新表征的scl在EMV下进行亚vt合成的结果与初始合成结果进行比较。最后,将时域驱动合成的结果与功率驱动合成的结果进行了比较。
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引用次数: 12
Phase noise analysis of a mechanical autonomous impact oscillator with a MEMS resonator 带有MEMS谐振器的机械自主冲击振荡器的相位噪声分析
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043647
F. Bizzarri, Xueyong Wei
In this paper, phase noise analysis of a mechanical autonomous impact oscillator with a MEMS resonator is performed. Since the circuit considered belongs to the class of hybrid systems, methods based on the variational model for the evaluation of either phase noise or steady state solutions cannot be directly applied. As a matter of fact, the monodromy matrix is not defined at impact events in these systems. By introducing saltation matrices, this limit is overcome and the aforementioned methods are extended. In particular, the unified theory developed by Demir is used to analyze the phase noise after evaluating the asymptotically stable periodic solution of the system by resorting to the shooting method. Numerical results are presented to show how noise sources affect the phase noise performances.
本文对一种带有MEMS谐振腔的机械自主冲击振荡器进行了相位噪声分析。由于所考虑的电路属于混合系统,因此不能直接应用基于变分模型的方法来评估相位噪声或稳态解。事实上,在这些系统的冲击事件中,单矩阵是没有定义的。通过引入跃变矩阵,克服了这一限制,并对上述方法进行了推广。特别是利用Demir的统一理论,通过射击法求得系统的渐近稳定周期解后,对相位噪声进行了分析。数值结果显示了噪声源对相位噪声性能的影响。
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引用次数: 9
Design considerations on CMOS limiting amplifiers for wearable biomedical systems 可穿戴生物医学系统CMOS限制放大器的设计考虑
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043344
J. Ramos, J. L. Ausín, J. F. Duque-Carrillo, G. Torelli
This paper presents design considerations on CMOS limiting amplifiers to be used as basic building blocks for power-efficient logarithmic amplifiers. The impact of mismatches and device-level properties on sensitivity and gain-bandwidth product is discussed. To this end, a comparison of several types of low-voltage gain cell topologies is presented. Based on statistical (Monte Carlo) results, a high-sensitivity eight-stage limiting amplifier tolerant of process and mismatch variations was designed in 0.35-µm CMOS technology to operate over a dc-to-20-MHz bandwidth. The proposed limiting amplifier draws 280 µA from a 2-V supply and achieves a voltage gain of 75 dB.
本文介绍了CMOS限制放大器的设计考虑,以作为节能对数放大器的基本构建模块。讨论了不匹配和器件级特性对灵敏度和增益-带宽积的影响。为此,对几种类型的低压增益单元拓扑结构进行了比较。基于统计(蒙特卡罗)结果,采用0.35µm CMOS技术设计了一个高灵敏度的8级限幅放大器,可容忍工艺和失配变化,工作带宽为dc- 20mhz。所提出的限制放大器从2 v电源中吸取280µA,并实现75 dB的电压增益。
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引用次数: 3
A dynamically error correctable bit parallel Montgomery multiplier over binary extension fields 二进制扩展域上的动态纠错位并行蒙哥马利乘法器
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043614
M. Poolakkaparambil, J. Mathew, A. Jabir, D. Pradhan
Galois field arithmetic circuits find wide variety of application in cryptography. Thus they faces majority of the hardware based attacks for malicious gain. Though there are many approaches that have been proposed to mitigate such malicious attacks, most of them are inappropriate for practical applicability due to various design drawbacks. It is noted that Galois field multipliers are one among the many core arithmetic modules that are inevitable in the cryptography processors. Among them Montgomery multipliers are studied and implemented in applications like Elliptical Curve Cryptography arithmetic. However, a multiple bit error correctable Montgomery multiplier has not yet been implemented to this end. In this paper, we propose a novel multiple bit error correctable bit-parallel Montgomery multipliers with dynamic error detection and correction. First we present the BCH code based multiple bit error correctable Montgomery multiplier design architecture. Then we propose a novel scheme for reducing the recurrent delay when no transient malicious attack is present. In comparison with the existing multiple bit error correctable bit parallel multiplier structures, our novel technique significantly reduces the delay and improves the performance.
伽罗瓦场算术电路在密码学中有着广泛的应用。因此,他们面临着大多数基于硬件的恶意攻击。虽然已经提出了许多方法来减轻这种恶意攻击,但由于各种设计缺陷,大多数方法都不适合实际应用。值得注意的是,伽罗瓦域乘法器是密码处理器中不可避免的众多核心算术模块之一。其中蒙哥马利乘法器在椭圆曲线密码算法等应用中得到了研究和实现。然而,一个多比特错误校正蒙哥马利乘法器尚未实现。本文提出了一种具有动态纠错检测和纠错功能的可纠错多比特并行蒙哥马利乘法器。首先提出了基于BCH码的可纠错多比特蒙哥马利乘法器的设计架构。在此基础上,提出了一种在不存在瞬态恶意攻击的情况下减少重复时延的新方案。与现有的多比特纠错位并行乘法器结构相比,我们的新技术显著降低了时延,提高了性能。
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引用次数: 3
Signal characterization of a pulsed-wire and heat flow system at a flow sensor 流量传感器中脉冲导线和热流系统的信号特性
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043374
O. Ecin, R. Viga, B. Hosticka, A. Grabmaier
This article describes a pulsed thermal Time-of-Flight (TTOF) flow sensor system as two subsystems i.e., a pulsed-wire system and a heat flow system. The entire flow sensor is regarded system-theoretically as a linear time-invariant (LTI) system and is described by its transfer function or impulse response. The characterization of the thermo-fluid dynamic signals obtained by a pulsed-wire and by a heat flow is strived. Hence, the impulse response of both pulsed-wire and heat flow is analyzed according to the flow velocity. Experimental and theoretical results are compared in a flow velocity range in air between 0.1 m/s and 1.4 m/s.
本文将脉冲热飞行时间(TTOF)流量传感器系统分为两个子系统,即脉冲线系统和热流系统。整个流量传感器在系统理论上被视为一个线性时不变(LTI)系统,并由其传递函数或脉冲响应来描述。对脉冲导线和热流所获得的热流体动力信号进行了表征。因此,根据流速分析了脉冲导线和热流的脉冲响应。实验结果与理论结果在0.1 ~ 1.4 m/s的空气流速范围内进行了比较。
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引用次数: 2
FFT and filter bank based spectrum sensing for WLAN signals 基于FFT和滤波器组的WLAN信号频谱检测
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043843
S. Dikmese, M. Renfors, H. Di̇nçer
As wireless communication devices have increased rapidly, much attention has been paid to the spectrum resources. Cognitive Radio (CR) technology has received increasing attention as a potential approach to utilize more effectively the radio frequency bands. CRs need to dynamically and reliably determine spectral holes which could be used for secondary transmissions. In this study, wideband multichannel spectrum sensing techniques are considered, using either FFT or filter bank based spectrum analysis. We focus on detecting spectral gaps between OFDM-based WLAN signals in the 2.4 GHz ISM band. It is found out that the limited spectral purity of WLAN signals, allowed by the 802.11g specifications, significantly restricts the ability to detect possible weaker signals in the spectral gaps between WLAN channels. Improved spectral purity of the primary signals greatly enhances the sensitivity of spectrum sensing, provided that spectrally well-contained filter bank based spectrum analysis methods are used.
随着无线通信设备的迅速增加,频谱资源越来越受到人们的重视。认知无线电(CR)技术作为一种更有效地利用无线电频段的潜在方法受到越来越多的关注。cr需要动态、可靠地确定可用于二次传输的光谱孔。在本研究中,考虑了宽带多通道频谱传感技术,使用FFT或基于滤波器组的频谱分析。我们的重点是在2.4 GHz ISM频段检测基于ofdm的WLAN信号之间的频谱间隙。研究发现,802.11g规范所允许的WLAN信号的有限频谱纯度,极大地限制了在WLAN信道之间的频谱间隙中检测可能较弱信号的能力。如果采用基于频谱完备滤波器组的频谱分析方法,则提高了原始信号的频谱纯度,大大提高了频谱感知的灵敏度。
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引用次数: 20
A novel CNN based image denoising model 一种新的基于CNN的图像去噪模型
Pub Date : 2011-10-13 DOI: 10.1109/ECCTD.2011.6043323
A. Slavova, Victoria Rashkova
The nonlinear diffusion PDE have been broadly applied in image processing. In this paper we propose a convection - diffusion filter by adding a convection term in the modified diffusion equation as a physical interpretation for removing the noise. We study the dynamics of such equations by the discretization of this convection - diffusion model via Cellular Nonlinear Networks (CNN). Numerical experiments show that our method is reasonably better in removing noise.
非线性扩散偏微分方程在图像处理中得到了广泛的应用。本文提出了一种对流-扩散滤波器,通过在修正的扩散方程中加入对流项作为去除噪声的物理解释。通过元胞非线性网络(CNN)对该对流扩散模型进行离散化,研究了该方程的动力学性质。数值实验表明,该方法具有较好的去噪效果。
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引用次数: 5
期刊
2011 20th European Conference on Circuit Theory and Design (ECCTD)
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