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Circuits and Systems II: Express Briefs, IEEE Transactions on

Issue 12 • Date Dec. 2004

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Displaying Results 1 - 15 of 15
  • Table of contents

    Page(s): c1
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

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  • Dynamical effects of missed switching in current-mode controlled DC-DC converters

    Page(s): 649 - 654
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB) |  | HTML iconHTML  

    Past investigations on nonlinear phenomena in DC-DC converters assume ideal switching and ignore the practical issue of switching ripples, for which the sampled data models yield piecewise smooth but continuous maps. In this brief, we show that the unavoidable nonidealities in the switching result in discontinuity in the map, which drastically changes the bifurcation structures. We demonstrate these effects experimentally, and develop simple one-dimensional models that account for switching delay and transients, and can predict the bifurcations in such systems with reasonable accuracy. Using the recent developments in bifurcation theory, we derive the limiting conditions for a reliable period-1 operation when these effects are considered. View full abstract»

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  • Congestion estimation for 3-D circuit architectures

    Page(s): 655 - 659
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    Three-dimensional (3-D) routing is an important step in deep submicrometer very large-scale integrated design. Given a 3-D grid graph and a set of two-terminal nets to be routed, we propose a probabilistic model to calculate the routing density (congestion) on each edge of the grid graph. The routing density provides a direct congestion estimation. Our experimental results demonstrate the effectiveness of the method on routing benchmarks. View full abstract»

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  • Effect of jitter on asynchronous sampling with finite number of samples

    Page(s): 660 - 664
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    In modern communication systems, the conversion of analog signals into digital form [analog-digital conversion (ADC)] is one of the most critical functions. A fundamental limit of the signal-to-noise ratio (SNR) achievable in this conversion is given by the jitter of the sampling clock. The requirements on the maximum jitter tolerable are typically specified using SNR expressions which hold in the case of an infinite number of samples. However, there are good reasons to investigate the resulting SNR when only a finite number of samples is taken into account. This paper evaluates the effective impact of jitter on the SNR of the ADC process when the observation interval is limited to a finite number of samples. It will be shown that, in this case, the jitter constraints on the sampling clock can be more relaxed. View full abstract»

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  • On the security of the Yi-Tan-Siew chaotic cipher

    Page(s): 665 - 669
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    This paper presents a comprehensive analysis on the security of the Yi-Tan-Siew chaotic cipher. A differential chosen-plaintext attack and a differential chosen-ciphertext attack are suggested to break the sub-key K, under the assumption that the time stamp can be altered by the attacker, which is reasonable in such attacks. Also, some security problems about the sub-keys α and β are clarified, from both theoretical and experimental points of view. Further analysis shows that the security of this cipher is independent of the use of the chaotic tent map, once the sub-key K is removed via the proposed suggested differential chosen-plaintext attack. View full abstract»

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  • Linear bipolar OTAs based on a triple-tail cell employing exponential circuits

    Page(s): 670 - 674
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB) |  | HTML iconHTML  

    Two types of new operational transconductance amplifiers (OTA), which are composed of exponential circuits and a triple-tail cell, are presented. The linear input voltage ranges of the proposed OTAs are wider than that of the triple-tail cell and have lower current consumption. The improvement of the signal-to-noise ratio is confirmed. The results of SPICE simulation show that the OTAs have good frequency responses. Monte Carlo simulation shows that the transconductance deviation of the proposed OTAs due to process variation is comparatively similar to that of the triple-tail cell. View full abstract»

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  • Systematic design of double-sampling ΣΔ A/D converters with a modified noise transfer function

    Page(s): 675 - 679
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB) |  | HTML iconHTML  

    Double-sampling ΣΔ analog-digital converters (ADCs) are sensitive to path mismatch which causes quantization noise to fold into the signal band. A recent solution for this problem consists of modifying the noise transfer function (NTF) of the modulator such that it has one or several zeros at the Nyquist frequency, next to those in the baseband. In this brief, we present a systematic design strategy for such ADCs. It consists of finding optimal pole positions for the modified NTF. This can be combined with optimizing the zeros as well. Next, we introduce several efficient structures that have enough degrees of freedom to realize the optimized pole positions. View full abstract»

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  • Performance of differential chaos-shift-keying digital communication systems over a multipath fading channel with delay spread

    Page(s): 680 - 684
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    The performance of the noncoherent differential chaos-shift-keying (DCSK) communication system over a multipath fading channel with delay spread is evaluated. Analytical expressions of the bit error rates are derived under the assumption of an independent Rayleigh fading two-ray channel model. Analytical and simulated results are presented and compared. The multipath performance of the DCSK system is also compared with that of the coherent CSK system as well as conventional generic waveform communication schemes. View full abstract»

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  • A delay-dependent stability criterion of neutral systems and its application to a partial element equivalent circuit model

    Page(s): 685 - 689
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    The real circuit model, such as a partial element equivalent circuit (PEEC), can be represented as a delay differential equation (DDE) of neutral type. The study of asymptotic stability of this kind of systems is of much importance due to the fragility of DDE solvers. Based on a descriptor system approach, new delay-dependent stability results are derived by introducing some free weighting matrices. As an application of the results, the delay-dependent stability problem of a PEEC model is investigated. The comparison of the results with the existing ones is finally given by using the PEEC model and another numerical example. View full abstract»

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  • List of Reviewers

    Page(s): 691 - 693
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  • 2004 Index

    Page(s): 694 - 708
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  • IEEE Circuits and Systems Society Information

    Page(s): c3
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs Information for authors

    Page(s): c4
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Aims & Scope

TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes:

  • Circuits: Analog, Digital and Mixed Signal Circuits and Systems  
  • Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic
  • Circuits and Systems, Power Electronics and Systems
  • Software for Analog-and-Logic Circuits and Systems
  • Control aspects of Circuits and Systems. 

Full Aims & Scope