Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206224
Kuo-Jen Lin, Chih-Jen Cheng
A CMOS current-mode geometric-mean circuit composed of n compact logarithm circuits and one compact exponential circuit is proposed. Approaches for constructing the logarithm circuits and the exponential circuit are based on second-order Taylor series approximations. By gathering the n logarithm results and passing through the exponential circuit, we can obtain the geometric-mean results. The circuitry complexity is low with only (3n + 3) transistors. The simulation results indicate that the relative errors of the proposed circuit are less than 2:5% for input range from 40µA to 75µA for n ≤ 5.
{"title":"CMOS current-mode geometric-mean circuit with n inputs","authors":"Kuo-Jen Lin, Chih-Jen Cheng","doi":"10.1109/ISSCS.2009.5206224","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206224","url":null,"abstract":"A CMOS current-mode geometric-mean circuit composed of n compact logarithm circuits and one compact exponential circuit is proposed. Approaches for constructing the logarithm circuits and the exponential circuit are based on second-order Taylor series approximations. By gathering the n logarithm results and passing through the exponential circuit, we can obtain the geometric-mean results. The circuitry complexity is low with only (3n + 3) transistors. The simulation results indicate that the relative errors of the proposed circuit are less than 2:5% for input range from 40µA to 75µA for n ≤ 5.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127796813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206192
Song-Bok Kim, M. Robens, R. Wunderlich, S. Heinen
Continuous-time quadrature bandpass sigma-delta modulators seriously suffer from finite gain bandwidth of the amplifiers they contain. In this paper, the performance limitation of the continuous-time quadrature bandpass sigma-delta modulator caused by finite gain bandwidth is presented. Finite gain bandwidth results in an unstable behavior of the complex integrators and a deviation from the center frequency. In order to improve stability of the complex integrator by finite GBW, it is desirable to employ a lossy integrator. The deviation from the center freqency affects the in-band noise power of the modulator. A compensation solution for reducing the deviation from the center frequency is proposed by means of transconductors at the amplifier inputs.
{"title":"Performance limitation by finite gbw in continuous-time quadrature bandpass sigma-delta modulators","authors":"Song-Bok Kim, M. Robens, R. Wunderlich, S. Heinen","doi":"10.1109/ISSCS.2009.5206192","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206192","url":null,"abstract":"Continuous-time quadrature bandpass sigma-delta modulators seriously suffer from finite gain bandwidth of the amplifiers they contain. In this paper, the performance limitation of the continuous-time quadrature bandpass sigma-delta modulator caused by finite gain bandwidth is presented. Finite gain bandwidth results in an unstable behavior of the complex integrators and a deviation from the center frequency. In order to improve stability of the complex integrator by finite GBW, it is desirable to employ a lossy integrator. The deviation from the center freqency affects the in-band noise power of the modulator. A compensation solution for reducing the deviation from the center frequency is proposed by means of transconductors at the amplifier inputs.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129082269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206107
C. Florea, C. Vertan, L. Florea, Alina Sultana
This paper proposes an extension of the widely used Logarithmic Image Processing (LIP) models by means of parametrization. The mathematical structure of the mentioned models is that of cone or vector space. Once the mathematical investigation defined the boundaries of these structures, parametric extensions of the known models are straight-forward. It has been showed that the implementation of Laplacian edge detector techniques under the LIP model yields superior performance. In this paper we shall prove that parametrization not only adds flexibility, but may also lead to superior quality.
{"title":"Non-linear parametric derivation of contour detectors for cellular images","authors":"C. Florea, C. Vertan, L. Florea, Alina Sultana","doi":"10.1109/ISSCS.2009.5206107","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206107","url":null,"abstract":"This paper proposes an extension of the widely used Logarithmic Image Processing (LIP) models by means of parametrization. The mathematical structure of the mentioned models is that of cone or vector space. Once the mathematical investigation defined the boundaries of these structures, parametric extensions of the known models are straight-forward. It has been showed that the implementation of Laplacian edge detector techniques under the LIP model yields superior performance. In this paper we shall prove that parametrization not only adds flexibility, but may also lead to superior quality.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129254373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206127
R. Dogaru, Hyongsuk Kim, I. Dogaru
A novel spread spectrum communication system is proposed, being characterized by a very compact yet efficient implementation. A particular elementary cellular automaton with rule 45 is used as the generator of spreading sequences while it also has synchronization capabilities. Simulations demonstrate that generated sequences are orthogonal and the performances of the proposed system are comparable to those of more sophisticated CDMA systems.
{"title":"Binary synchronization in cellular automata for building compact CDMA systems","authors":"R. Dogaru, Hyongsuk Kim, I. Dogaru","doi":"10.1109/ISSCS.2009.5206127","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206127","url":null,"abstract":"A novel spread spectrum communication system is proposed, being characterized by a very compact yet efficient implementation. A particular elementary cellular automaton with rule 45 is used as the generator of spreading sequences while it also has synchronization capabilities. Simulations demonstrate that generated sequences are orthogonal and the performances of the proposed system are comparable to those of more sophisticated CDMA systems.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115408874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206147
Victor Grigoras, Vasilica Tataru, Carmen Grigoras
This contribution highlights the possibility of building an analog communication channel achieving some extra security by means of chaos synchronization. The input-output correspondence ensured by the proposed approach is linear and band-limited, leading to the possibility of a simple feed-forward channel equalization.
{"title":"Chaos modulation communication channel: A case study","authors":"Victor Grigoras, Vasilica Tataru, Carmen Grigoras","doi":"10.1109/ISSCS.2009.5206147","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206147","url":null,"abstract":"This contribution highlights the possibility of building an analog communication channel achieving some extra security by means of chaos synchronization. The input-output correspondence ensured by the proposed approach is linear and band-limited, leading to the possibility of a simple feed-forward channel equalization.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"20 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114119461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206196
J. Radic, A. Djugova, M. Videnovic-Misic
In this work a design of a 2.4 GHz current reuse low noise amplifier (LNA) in a standard 0.35 µm SiGe technology is presented. In order to achieve good input matching for narrow bandwidth the inductive source degeneration LNA topology is used. Low power consumption with higher gain is obtained using current reuse configuration. In order to provide good isolation and stability cascode amplifier, as a part of current reuse topology, is used. For given configuration, good trade-off between low noise, high gain and stability has been achieved. Optimized LNA has −21.18 dB input return loss (S11), high reverse isolation of −47.51 dB (S12), very high voltage gain (S21) of 23.54 dB, −15.93 dB output return loss (S22), noise figure of 2.7 dB, and a power consumption of 5 mA at 3.3 V. The LNA presented offers high circuit stability parameters B1f=979.6 m and K=7.658.
本文提出了一种基于标准0.35 μ m SiGe技术的2.4 GHz电流复用低噪声放大器(LNA)的设计方案。为了在窄带宽下实现良好的输入匹配，采用了感应源退化LNA拓扑。采用电流复用结构，实现了低功耗高增益。为了提供良好的隔离性和稳定性，采用级联放大器作为电流复用拓扑的一部分。在给定的配置下，实现了低噪声、高增益和稳定性之间的良好平衡。优化后的LNA具有−21.18 dB的输入回波损耗(S11)、−47.51 dB的高反向隔离(S12)、23.54 dB的极高电压增益(S21)、−15.93 dB的输出回波损耗(S22)、2.7 dB的噪声系数和3.3 V时的5 mA功耗。所提出的LNA具有较高的电路稳定性参数B1f=979.6 m, K=7.658。
{"title":"A 2.4 GHz high-gain low noise amplifier","authors":"J. Radic, A. Djugova, M. Videnovic-Misic","doi":"10.1109/ISSCS.2009.5206196","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206196","url":null,"abstract":"In this work a design of a 2.4 GHz current reuse low noise amplifier (LNA) in a standard 0.35 µm SiGe technology is presented. In order to achieve good input matching for narrow bandwidth the inductive source degeneration LNA topology is used. Low power consumption with higher gain is obtained using current reuse configuration. In order to provide good isolation and stability cascode amplifier, as a part of current reuse topology, is used. For given configuration, good trade-off between low noise, high gain and stability has been achieved. Optimized LNA has −21.18 dB input return loss (S11), high reverse isolation of −47.51 dB (S12), very high voltage gain (S21) of 23.54 dB, −15.93 dB output return loss (S22), noise figure of 2.7 dB, and a power consumption of 5 mA at 3.3 V. The LNA presented offers high circuit stability parameters B1f=979.6 m and K=7.658.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"35 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114135053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206208
B. Ionescu, A. Pacureanu, P. Lambert, C. Vertan
In this paper we tackle the issue of highlighting action content in animated movies, which proves to be a valuable information for retrieving movies in content-based video indexing systems. We use the hypothesis that action is in general related to a high frequency of video transitions, and adapt it to the constraints of the animation domain. First, we perform a video temporal segmentation by detecting cuts, fades, dissolves and specific color effects. Second, we analyze the movie rhythm, in terms of shot changes over a time unit. We target several action categories, namely: hot action, regular action and low action. This constitutes the action groundtruth. Finally, we employ a four step algorithm (thresholding, merging, pruning, restoring complementarity) to highlight movie parts according to the previously determined groundtruth. The efficiency of our approach was tested on several pre-labeled animated movies, achieving precision and recall ratios of more than 70%.
{"title":"Highlighting action content in animated movies","authors":"B. Ionescu, A. Pacureanu, P. Lambert, C. Vertan","doi":"10.1109/ISSCS.2009.5206208","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206208","url":null,"abstract":"In this paper we tackle the issue of highlighting action content in animated movies, which proves to be a valuable information for retrieving movies in content-based video indexing systems. We use the hypothesis that action is in general related to a high frequency of video transitions, and adapt it to the constraints of the animation domain. First, we perform a video temporal segmentation by detecting cuts, fades, dissolves and specific color effects. Second, we analyze the movie rhythm, in terms of shot changes over a time unit. We target several action categories, namely: hot action, regular action and low action. This constitutes the action groundtruth. Finally, we employ a four step algorithm (thresholding, merging, pruning, restoring complementarity) to highlight movie parts according to the previously determined groundtruth. The efficiency of our approach was tested on several pre-labeled animated movies, achieving precision and recall ratios of more than 70%.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125479573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206175
C. Stolojescu, Alina Cusnir, S. Moga, A. Isar
The goal of this paper is to adapt a already known traffic forecasting methodology, based on statistical data processing in the field of wavelets, to the case of WiMAX networks, to predict where and when upgrading must take place.
{"title":"Forecasting WiMAX BS traffic by statistical processing in the wavelet domain","authors":"C. Stolojescu, Alina Cusnir, S. Moga, A. Isar","doi":"10.1109/ISSCS.2009.5206175","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206175","url":null,"abstract":"The goal of this paper is to adapt a already known traffic forecasting methodology, based on statistical data processing in the field of wavelets, to the case of WiMAX networks, to predict where and when upgrading must take place.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125861105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206131
L. Goras, I. Alecsandrescu, I. Vornicu
Cellular Neural Network (CNN) type analog parallel architectures have been studied both for their potential in high-speed image processing applications and for exhibiting rich and exciting nonlinear spatio-temporal dynamics among which waves and patterns. Such architectures have been also used as linear spatial filters for piecewise linear cells working in the linear central part of their characteristics. The spatio-temporal dynamics of homogeneous CNN's working in the above region can be studied using the decoupling technique. Since, for nohomogeneous arrays, this technique is no more valid, numerical simulations were used. The paper presents results regarding the filtering capabilities of analog parallel architectures of CNN simulated at system and transistor level.
{"title":"Spatial filtering using linear analog parallel architectures","authors":"L. Goras, I. Alecsandrescu, I. Vornicu","doi":"10.1109/ISSCS.2009.5206131","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206131","url":null,"abstract":"Cellular Neural Network (CNN) type analog parallel architectures have been studied both for their potential in high-speed image processing applications and for exhibiting rich and exciting nonlinear spatio-temporal dynamics among which waves and patterns. Such architectures have been also used as linear spatial filters for piecewise linear cells working in the linear central part of their characteristics. The spatio-temporal dynamics of homogeneous CNN's working in the above region can be studied using the decoupling technique. Since, for nohomogeneous arrays, this technique is no more valid, numerical simulations were used. The paper presents results regarding the filtering capabilities of analog parallel architectures of CNN simulated at system and transistor level.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122599626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206112
S. Ibrahim, B. Razavi
The use of multi-tone signaling can avoid the high loss of FR4 traces beyond 10 GHz while confining the task of equalization to 2.5-GHz-wide subchannels. This paper presents multi-tone transceiver design issues and derives performance requirements such as linearity, sensitivity, quadrature mismatches, and phase noise. Possible transmitter and receiver implementations are described and a critical interference effect resulting from local oscillator harmonics is identified.
{"title":"Design requirements of 20-Gb/s serial links using multi-tone signaling","authors":"S. Ibrahim, B. Razavi","doi":"10.1109/ISSCS.2009.5206112","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206112","url":null,"abstract":"The use of multi-tone signaling can avoid the high loss of FR4 traces beyond 10 GHz while confining the task of equalization to 2.5-GHz-wide subchannels. This paper presents multi-tone transceiver design issues and derives performance requirements such as linearity, sensitivity, quadrature mismatches, and phase noise. Possible transmitter and receiver implementations are described and a critical interference effect resulting from local oscillator harmonics is identified.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126288934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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