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An object oriented programming approach for the generation of test vectors for VLSI design 一种面向对象的程序设计方法,用于超大规模集成电路设计的测试向量的生成
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.612888
A. Cruz
A new approach was used in the development of the implementation of a minimal test vector generation algorithm for single and multiple fault detection in a PLA. The conversion of product terms from binary notation to decimal notation simplifies the development of the C language subroutines used for the implementation. The ordered position in our approach allows us to find a complete test vector in a single comparison in some instances and makes it feasible to find complete test vectors having a d/sub H/=k in an n-dimensional subspace, e.g., even if 99.21875% of the minterms in an 8-dimensional subspace are bounded.
一种新的方法被用于开发用于PLA单故障和多故障检测的最小测试向量生成算法的实现。将乘积项从二进制表示法转换为十进制表示法简化了用于实现的C语言子程序的开发。我们方法中的有序位置允许我们在某些情况下在单个比较中找到一个完整的测试向量,并且使得在n维子空间中找到具有d/sub H/=k的完整测试向量成为可能,例如,即使在8维子空间中99.21875%的最小项是有界的。
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引用次数: 0
Reconfiguration of degradable VLSI/WSI arrays under the constraint of row bypass and column rerouting 行旁路和列重路由约束下可降解VLSI/WSI阵列的重构
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.621438
C. Low
This paper examine the problem of reconfiguring two dimensional VLSI/WSI arrays via the degradation approach. In this approach, all elements are treated uniformly and no elements are dedicated as spares. The goal is to derive a fault-free subarray T from the defective host array such that the dimensions of T are larger than some specified minimum. This problem is known to be NP-complete under the constraint of row bypass and column rerouting. However, we show that a special case of the reconfiguration problem is optimally solvable in linear time. Using this result, a new fast and efficient reconfiguration algorithm is proposed for the general problem. Empirical study shows that the new algorithm indeed produce good results in terms of the percentages of harvest and degradation of VLSI/WSI arrays.
本文研究了利用退化方法重构二维VLSI/WSI阵列的问题。在这种方法中,所有元素都被统一处理,没有任何元素被专用为备用元素。目标是从有缺陷的主机阵列派生出无故障的子阵列T,使得T的维度大于某个指定的最小值。这个问题在行旁路和列重路由的约束下是np完全的。然而,我们证明了重构问题的一个特殊情况在线性时间内是最优可解的。在此基础上,针对一般问题提出了一种快速有效的重构算法。实证研究表明,新算法在VLSI/WSI阵列的收获率和退化率方面确实取得了很好的效果。
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引用次数: 0
Implementation of thermoelectric microwave power sensors in CMOS technology 热电微波功率传感器的CMOS技术实现
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.612895
V. Milanovic, M. Gaitan, E. D. Bowen, N. Tea, M. Zaghloul
This paper presents two implementations of efficient thermoelectric microwave power sensors fabricated through commercial CMOS processes with additional maskless etching. Two types of thermocouple detectors were fabricated and tested. Both types measure true rms power of signals in the frequency range up to 20 GHz and input power range from -30 dBm to +10 dBm. The devices have linearity better than /spl plusmn/0.4% for output dc voltage vs. input microwave power over this 40 dB dynamic range. Measurements obtained using an automatic network analyzer show an acceptable input return loss of less than -20 dB over the entire frequency range.
本文介绍了两种采用商用CMOS工艺制作的热电微波功率传感器的实现,并附加了无掩膜蚀刻。制作并测试了两种类型的热电偶探测器。两种类型的测量信号的真实有效值功率,频率范围为20ghz,输入功率范围为- 30dbm至+ 10dbm。在此40 dB动态范围内,器件输出直流电压与输入微波功率的线性度优于/spl plusmn/0.4%。使用自动网络分析仪获得的测量结果显示,在整个频率范围内,可接受的输入回波损耗小于-20 dB。
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引用次数: 14
Improving image coding using significance of wavelet coefficients with an efficient edge extension 利用小波系数的显著性和有效的边缘扩展改进图像编码
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.622089
Jiaming Li, J. S. Jin
This paper presents our efforts on improving wavelet transform based image coding. In particular, by making use of efficient image edge extension, a high performance significant-wavelet-coefficient-based image coding (SWCBIC) is developed. Compared with the performance of original significant-wavelet-coefficient-based scheme, namely embedded zerotree wavelet (EZW) coding, our algorithm shows improvement on image quality, especially at a high compression ratio.
本文对基于小波变换的图像编码进行了改进。特别是利用有效的图像边缘扩展,开发了一种高性能的基于显著小波系数的图像编码(SWCBIC)。与原始的基于显著小波系数的方案,即嵌入式零树小波(EZW)编码的性能相比,我们的算法在图像质量上有改善,特别是在高压缩比下。
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引用次数: 0
Investigation of nonlinear modal behavior of HVDC/AC power systems through a scanning tool via normal form technique 基于范式技术的扫描工具研究高压直流/交流电力系统的非线性模态行为
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.621871
Y. Ni, V. Vittal, W. Kliemann
In this paper a scanning tool based on the normal form technique is developed for the investigation of nonlinear modal behavior of AC/DC power systems with DC power modulation. The AC-DC interface variables are solved by symbolic calculation software MAPLE. A state space model is then formed for normal form method with second order approximation. A 4-generator AC/DC power system is studied with different fault locations and various input signals for DC power modulation.
本文开发了一种基于范式技术的扫描工具,用于研究具有直流功率调制的交直流电源系统的非线性模态行为。用符号计算软件MAPLE求解交直流接口变量。在此基础上,通过二阶近似建立了范式方法的状态空间模型。研究了具有不同故障位置和不同直流功率调制输入信号的4发电机交直流电源系统。
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引用次数: 1
Gabor filters for rotation invariant texture classification 旋转不变纹理分类的Gabor滤波器
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.622026
R. Porter, N. Canagarajah
A Gabor filter based feature extraction scheme for texture classification is proposed. By using a novel set of circularly symmetric filters, rotation invariance is achieved. The scheme offers a high classification performance on textures at any orientation using both fewer features and a smaller area of analysis than most existing schemes. The performance of the scheme on noisy images is also investigated, demonstrating a high robustness to noise.
提出了一种基于Gabor滤波器的纹理分类特征提取方案。通过使用一组新颖的圆对称滤波器,实现了旋转不变性。与大多数现有方案相比,该方案使用更少的特征和更小的分析面积,在任何方向上都提供了更高的纹理分类性能。研究了该方法在噪声图像上的性能,证明了该方法对噪声具有较高的鲁棒性。
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引用次数: 21
An improved voltage doubler in a standard CMOS technology 在标准CMOS技术中改进的电压倍频器
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.608688
P. Favrat, P. Deval, M. Declercq
A charge pump cell is used to make a voltage doubler using improved serial switches. The PMOS transistor used for the serial switch is analyzed and a model ready for simulation is described. The importance of capacitors is shown with plots of efficiency versus load and stray capacitors. Several optimizations and problems arising at low voltage or high frequency are presented. The substrate current is totally suppressed by the technique of bulk commutation. The real efficiency, when all optimizations are implemented, approaches 80%.
使用改进的串行开关,电荷泵电池用于制造电压倍增器。分析了用于串行开关的PMOS晶体管,并描述了一个可用于仿真的模型。电容的重要性用效率与负载关系图和杂散电容图来说明。提出了在低电压和高频率下的几种优化方法和存在的问题。基片电流被整体整流技术完全抑制。当实现所有优化时,实际效率接近80%。
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引用次数: 20
Linear phase variable 2-D filter design using real-complex decomposition 采用实复分解的线性相位变量二维滤波器设计
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.612821
T. Deng
This paper proposes a new method for designing two-dimensional (2-D) variable digital filters with arbitrary variable magnitude characteristics and linear phases. By combining the given variable magnitude specification with linear phase specification, we first form a variable 2-D frequency response specification. Then we propose a real-complex decomposition method for decomposing the complex-valued variable specification into real-valued and complex-valued components. Finally, the resulting real-valued components are approximated by using 1-D polynomials, and the complex-valued components are approximated by the normal constant 2-D filters. Connecting the 1-D polynomials and 2-D constant filters obtains a variable 2-D filter. The significant advantage of the design method lies in that it can reduce the original difficult problem to a set of easier ones through the real-complex decomposition of the given variable specification.
本文提出了一种设计具有任意变幅特性和线性相位的二维(2-D)可变数字滤波器的新方法。通过将给定的变幅值规格与线性相位规格相结合,我们首先形成了一个可变的二维频率响应规格。然后提出了一种将复值变量规格分解为实值和复值分量的实-复分解方法。最后,用一维多项式近似得到实值分量,用常规常数二维滤波器近似得到复值分量。将一维多项式与二维常数滤波器连接起来,得到一个变量二维滤波器。该设计方法的显著优点在于通过对给定的变量规格进行实复分解,将原来的难题简化为一组较为简单的问题。
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引用次数: 3
A new precoding for ISI cancellation using multirate filterbanks 一种基于多速率滤波器组的ISI抵消预编码方法
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.612809
X. Xia
In this paper, we propose a new precoding scheme for intersymbol interference (ISI) cancellation using multirate filterbanks. The ISI channel may not have inverses, such as frequency-selective fading channels. We present a necessary and sufficient condition on an FIR ISI transfer function in terms of its zero set such that a linear FIR ideal equalizer exists. The condition is easy to check and satisfy. Designs of pre/postcodings are also presented. A numerical example is presented to illustrate the theory.
本文提出了一种利用多速率滤波器组消除码间干扰的预编码方案。ISI信道可能没有逆,例如频率选择性衰落信道。从FIR ISI传递函数的零集出发,给出了线性FIR理想均衡器存在的充分必要条件。该条件易于检查和满足。本文还介绍了前编码和后编码的设计。最后给出了一个数值算例来说明该理论。
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引用次数: 6
The controller IC for modified active addressing STN LCDs 用于改进的主动寻址STN液晶显示器的控制器IC
Pub Date : 1997-06-09 DOI: 10.1109/ISCAS.1997.622169
Hao-Ping Hong, Jiin-Chuan Wu
A modified active addressing technique, which combines the ideas of PHM active addressing and subgroup, is proposed to make possible high-brightness, high-contrast, gray-scale, low-voltage, and low-cost STN displays. Based on this technique, a driver controller for 240/spl times/640 STN LCDs is implemented into an IC.
为了实现高亮度、高对比度、灰度、低电压和低成本的STN显示,提出了一种改进的主动寻址技术,该技术结合了PHM主动寻址和子群的思想。基于该技术,实现了240/spl倍/640 STN液晶的驱动控制器。
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引用次数: 1
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