Pub Date : 2007-08-01DOI: 10.1109/ECCTD.2007.4529759
A. Sarmiento-Reyes, J. Torres, L. Hernández-Martínez, M. D. Anda
A MAPLE-based package for detecting feedback loops -positive and negative - has been developed. The tool accepts the circuit description either through a SPICE-like input file or via a schematic editor. The method for finding feedback loops is based on a slightly modified version of the well-known LU decomposition algorithm. In the paper, the idea behind this approach is explained by resorting to topology- based concepts of the LU decomposition. The tool delivers symbolic expressions of the transfer functions belonging to the feedback loops that are embedded in the circuit. These transfer functions can be used to establish ulterior design guidelines.
{"title":"FFinder: A MAPLE-based CAD frame for identifying feedback loops in electric circuits","authors":"A. Sarmiento-Reyes, J. Torres, L. Hernández-Martínez, M. D. Anda","doi":"10.1109/ECCTD.2007.4529759","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529759","url":null,"abstract":"A MAPLE-based package for detecting feedback loops -positive and negative - has been developed. The tool accepts the circuit description either through a SPICE-like input file or via a schematic editor. The method for finding feedback loops is based on a slightly modified version of the well-known LU decomposition algorithm. In the paper, the idea behind this approach is explained by resorting to topology- based concepts of the LU decomposition. The tool delivers symbolic expressions of the transfer functions belonging to the feedback loops that are embedded in the circuit. These transfer functions can be used to establish ulterior design guidelines.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134282326","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529652
A. D. Grasso, S. Pennisi, F. Centurelli, G. Scotti, A. Trifiletti
A bias technique for low-voltage class AB amplifiers is presented. The approach exploits the bulk terminal to set the output quiescent current of a two-stage class-AB CMOS OTA in a reliable manner and without reducing the maximum swing capability. Simulations on a designed example using a 0.25-mum CMOS process show the viability of the approach.
提出了一种低压AB类放大器的偏置技术。该方法利用bulk端子可靠地设置两级ab类CMOS OTA的输出静态电流，且不降低最大摆幅能力。在0.25 μ m CMOS工艺设计实例上的仿真表明了该方法的可行性。
{"title":"CMOS Miller OTA with body-biased output stage","authors":"A. D. Grasso, S. Pennisi, F. Centurelli, G. Scotti, A. Trifiletti","doi":"10.1109/ECCTD.2007.4529652","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529652","url":null,"abstract":"A bias technique for low-voltage class AB amplifiers is presented. The approach exploits the bulk terminal to set the output quiescent current of a two-stage class-AB CMOS OTA in a reliable manner and without reducing the maximum swing capability. Simulations on a designed example using a 0.25-mum CMOS process show the viability of the approach.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133191615","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529522
J. M. Pozo, S. Celma, M. T. Sanz, J. P. Alegre
This paper presents a low-voltage variable preamplifier with automatic gain control, which works at 3.125 Gb/s in the optical standard 10Gbase-LX4. The system incorporates a circuit that minimizes the temperature effects. The preamplifier achieves adaptive transresistance, 60-74 dBOmega, with an almost constant bandwidth, 2.2 GHz, and with no peaks in the frequency response. The circuit was designed in 0.18 mum CMOS technology with a single 1.8 V supply voltage.
本文设计了一种具有自动增益控制的低压可变前置放大器，在10Gbase-LX4光标准下工作速度为3.125 Gb/s。该系统集成了一个电路，可以将温度影响降到最低。前置放大器实现自适应跨阻，60-74 dbomomega，带宽几乎恒定，2.2 GHz，频率响应无峰值。该电路采用0.18 μ m CMOS技术，单电源电压为1.8 V。
{"title":"3.125 Gb/s temperature compensated CMOS optical preamplifier with automatic gain control","authors":"J. M. Pozo, S. Celma, M. T. Sanz, J. P. Alegre","doi":"10.1109/ECCTD.2007.4529522","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529522","url":null,"abstract":"This paper presents a low-voltage variable preamplifier with automatic gain control, which works at 3.125 Gb/s in the optical standard 10Gbase-LX4. The system incorporates a circuit that minimizes the temperature effects. The preamplifier achieves adaptive transresistance, 60-74 dBOmega, with an almost constant bandwidth, 2.2 GHz, and with no peaks in the frequency response. The circuit was designed in 0.18 mum CMOS technology with a single 1.8 V supply voltage.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132086612","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529755
N. Massari, S. A. Jawed, M. Gottardi
A new type of asynchronous time-based digital camera is here presented. The sensor architecture is characterized by a new analog low-power winner take all (WTA) network shared among all the pixels of the array. This circuit detects the most illuminated pixel and transmits it through the channel by queuing the other competitors. An iterative algorithm allows to read-out the entire array, temporally dispatching the information by means of an asynchronous read-out circuit placed at column and row level. The pixel, designed with a 0.35 mum CMOS technology and consisting of 28 transistors, performs a simulated average power consumption less than 10 nW @ 1.8 V for an impinging light power of 100 muW/cm2.
提出了一种新型的异步定时数码相机。该传感器结构的特点是在阵列的所有像素之间共享一种新的模拟低功耗赢家通吃(WTA)网络。该电路检测到最亮的像素，并通过通道将其他竞争对手排队传输。迭代算法允许读出整个数组，通过放置在列和行级别的异步读出电路暂时分派信息。该像素采用0.35 μ m CMOS技术设计，由28个晶体管组成，在入射光功率为100 μ w /cm2时，模拟平均功耗低于10 nW @ 1.8 V。
{"title":"A collision-free time-to-first spike camera architecture based on a winner-take-all network","authors":"N. Massari, S. A. Jawed, M. Gottardi","doi":"10.1109/ECCTD.2007.4529755","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529755","url":null,"abstract":"A new type of asynchronous time-based digital camera is here presented. The sensor architecture is characterized by a new analog low-power winner take all (WTA) network shared among all the pixels of the array. This circuit detects the most illuminated pixel and transmits it through the channel by queuing the other competitors. An iterative algorithm allows to read-out the entire array, temporally dispatching the information by means of an asynchronous read-out circuit placed at column and row level. The pixel, designed with a 0.35 mum CMOS technology and consisting of 28 transistors, performs a simulated average power consumption less than 10 nW @ 1.8 V for an impinging light power of 100 muW/cm2.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133950043","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529696
L. Marco, E. Alarcón
One of the major drawbacks that precludes the use of sliding-mode control wideband signal tracking in buck-based switching power amplifiers is the lack of a design-oriented analysis of tracking bandwidth limits. In this paper the tracking limits for a linear-surface sliding-mode controlled ideal buck converter are addressed for different representative cases, namely, for a single tone, two tones, multiple tone, and a generalization to an arbitrary wideband signal. Analytical design-oriented equations are matched with simulations both for synthetic single-tone and arbitrary wideband noise signal as well as for the envelope signal corresponding to the EDGE standard in an envelope elimination and restoration technique polar RF transmitter architecture.
{"title":"Derivation of the sliding domain for a buck-based switching amplifier in wideband signal tracking applications","authors":"L. Marco, E. Alarcón","doi":"10.1109/ECCTD.2007.4529696","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529696","url":null,"abstract":"One of the major drawbacks that precludes the use of sliding-mode control wideband signal tracking in buck-based switching power amplifiers is the lack of a design-oriented analysis of tracking bandwidth limits. In this paper the tracking limits for a linear-surface sliding-mode controlled ideal buck converter are addressed for different representative cases, namely, for a single tone, two tones, multiple tone, and a generalization to an arbitrary wideband signal. Analytical design-oriented equations are matched with simulations both for synthetic single-tone and arbitrary wideband noise signal as well as for the envelope signal corresponding to the EDGE standard in an envelope elimination and restoration technique polar RF transmitter architecture.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123899027","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529713
Piotr Zegarmistrz, Z. Galias
In this work we investigate the problem of reconstruction of conductances in resistor grids. The algorithm proposed by Curtis and Morrow is studied here in terms of numerical stability. We also test its performance in the presence of measurement errors. We show that measurement errors can deteriorate the performance of the algorithm even for small grid sizes and that the algorithm is numerically unstable for larger grids. We propose several methods for improving the algorithm and test the performance of its modified versions.
{"title":"On reconstruction of conductances in resistor grids from boundary measurements","authors":"Piotr Zegarmistrz, Z. Galias","doi":"10.1109/ECCTD.2007.4529713","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529713","url":null,"abstract":"In this work we investigate the problem of reconstruction of conductances in resistor grids. The algorithm proposed by Curtis and Morrow is studied here in terms of numerical stability. We also test its performance in the presence of measurement errors. We show that measurement errors can deteriorate the performance of the algorithm even for small grid sizes and that the algorithm is numerically unstable for larger grids. We propose several methods for improving the algorithm and test the performance of its modified versions.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127742950","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529748
Ryo Imabayashi, Y. Uwate, Y. Nishio
In this study, the breakdown of synchronization observed from four coupled chaotic oscillators is investigated. In order to understand the phenomenon, the model of coupled modified van der Pol oscillators with noise is considered. The comparison of the coupled chaotic oscillators with the coupled modified van der Pol oscillators with noise gives us some interesting results.
{"title":"Breakdown of synchronization in chaotic oscillators and noisy oscillators","authors":"Ryo Imabayashi, Y. Uwate, Y. Nishio","doi":"10.1109/ECCTD.2007.4529748","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529748","url":null,"abstract":"In this study, the breakdown of synchronization observed from four coupled chaotic oscillators is investigated. In order to understand the phenomenon, the model of coupled modified van der Pol oscillators with noise is considered. The comparison of the coupled chaotic oscillators with the coupled modified van der Pol oscillators with noise gives us some interesting results.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127819439","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529612
H. Barthélemy, S. Bourdel, J. Gaubert, S. Meillére
In this paper a simple FSK/OOK modulator based on a proposed CMOS coupled voltage controlled oscillators is presented. In FSK mode the circuit is a non-continuous phase FSK (NCPFSK) which exhibits a relatively low phase discontinuity at the frequency transition times. The proposed modulator is built from CMOS inverters. The circuit is self biased and the frequency of oscillations can be easily shifted by opening and closing the open loop of each oscillators. Regarding technology, the modulator, which uses any active inductor, is able to operate at high frequency and provides digital output with suitable phase noise. Simulation result from typical parameters of a 0.35 mum CMOS Process is given. The circuit functioning has been also acted from measurements completed from prototypes fabricated with HFE4069 from Philips Semiconductor [1].
本文提出了一种基于CMOS耦合压控振荡器的简单FSK/OOK调制器。在FSK模式下，电路是一个非连续相位FSK (NCPFSK)，在频率转换时间表现出相对较低的相位不连续。所提出的调制器由CMOS逆变器构成。该电路是自偏置的，通过打开和关闭每个振荡器的开环可以很容易地改变振荡的频率。在技术方面，该调制器采用任意有源电感，能够在高频率下工作，并提供具有合适相位噪声的数字输出。给出了0.35 μ m CMOS工艺典型参数的仿真结果。电路的功能也已经从飞利浦半导体的HFE4069制造的原型完成的测量中发挥作用[1]。
{"title":"OOK/NCP-FSK modulator based on coupled open-closed-loop VCOs","authors":"H. Barthélemy, S. Bourdel, J. Gaubert, S. Meillére","doi":"10.1109/ECCTD.2007.4529612","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529612","url":null,"abstract":"In this paper a simple FSK/OOK modulator based on a proposed CMOS coupled voltage controlled oscillators is presented. In FSK mode the circuit is a non-continuous phase FSK (NCPFSK) which exhibits a relatively low phase discontinuity at the frequency transition times. The proposed modulator is built from CMOS inverters. The circuit is self biased and the frequency of oscillations can be easily shifted by opening and closing the open loop of each oscillators. Regarding technology, the modulator, which uses any active inductor, is able to operate at high frequency and provides digital output with suitable phase noise. Simulation result from typical parameters of a 0.35 mum CMOS Process is given. The circuit functioning has been also acted from measurements completed from prototypes fabricated with HFE4069 from Philips Semiconductor [1].","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128594029","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529539
Davide Brandano, M. Delgado-Restituto, J. Ruiz-Amaya, Á. Rodríguez-Vázquez
An Electrostatic Discharge (ESD) protected Low- Noise Amplifier (LNA) for the 2.4 GHz ISM band designed in a 0.13 mum standard RFCMOS technology is presented. The amplifier, including packaging effects, achieves 16.8 dB power gain, reflexion coefficients S11, S22 < -30 dB over the 2.4 GHz ISM band, a peak noise figure of 1.8 dB, and an IIP3 of 1 dBm, while drawing less than 4.5 mA dc biasing current from the 1.2 V power supply. Further, the LNA withstands a Human Body Model (HBM) ESD stress up to plusmn2.0 kV, by means of the additional custom protection circuitry.
{"title":"A 5.3mW, 2.4GHz ESD protected Low-Noise Amplifier in a 0.13μm RFCMOS technology","authors":"Davide Brandano, M. Delgado-Restituto, J. Ruiz-Amaya, Á. Rodríguez-Vázquez","doi":"10.1109/ECCTD.2007.4529539","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529539","url":null,"abstract":"An Electrostatic Discharge (ESD) protected Low- Noise Amplifier (LNA) for the 2.4 GHz ISM band designed in a 0.13 mum standard RFCMOS technology is presented. The amplifier, including packaging effects, achieves 16.8 dB power gain, reflexion coefficients S11, S22 < -30 dB over the 2.4 GHz ISM band, a peak noise figure of 1.8 dB, and an IIP3 of 1 dBm, while drawing less than 4.5 mA dc biasing current from the 1.2 V power supply. Further, the LNA withstands a Human Body Model (HBM) ESD stress up to plusmn2.0 kV, by means of the additional custom protection circuitry.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129233824","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 : 2007-08-01DOI: 10.1109/ECCTD.2007.4529728
Z. Garczarczyk
In this paper a diagnostic method for analog electronic circuits is presented. The approach is based on determination of the variations of circuit functions with use of higher order sensitivity coefficients. Knowing values of sensitivity coefficients one can formulate multivariate polynomial equations. The solution of test equations with respect to element's deviations results in fault identification. This task can be realized by using Grobner bases to transform a nonlinear equation into triangular form. It is solved by successive computation of the univariate polynomial equation and back substitution. Solution of the polynomial equation is treated as the eigenvalue problem of companion matrix by QR algorithm. Numerical results are presented to clarify method and prove its efficiency.
{"title":"Polynomial fault diagnosis of linear analog circuits","authors":"Z. Garczarczyk","doi":"10.1109/ECCTD.2007.4529728","DOIUrl":"https://doi.org/10.1109/ECCTD.2007.4529728","url":null,"abstract":"In this paper a diagnostic method for analog electronic circuits is presented. The approach is based on determination of the variations of circuit functions with use of higher order sensitivity coefficients. Knowing values of sensitivity coefficients one can formulate multivariate polynomial equations. The solution of test equations with respect to element's deviations results in fault identification. This task can be realized by using Grobner bases to transform a nonlinear equation into triangular form. It is solved by successive computation of the univariate polynomial equation and back substitution. Solution of the polynomial equation is treated as the eigenvalue problem of companion matrix by QR algorithm. Numerical results are presented to clarify method and prove its efficiency.","PeriodicalId":445822,"journal":{"name":"2007 18th European Conference on Circuit Theory and Design","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116666308","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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