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IEEE Transactions on Circuits and Systems II: Express Briefs

Issue 4 • Date April 2009

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Displaying Results 1 - 20 of 20
  • Table of contents

    Publication Year: 2009, Page(s): C1
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

    Publication Year: 2009, Page(s): C2
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  • A 60-W Multicarrier WCDMA Power Amplifier Using an RF Predistorter

    Publication Year: 2009, Page(s):265 - 269
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB) | HTML iconHTML

    In this brief, we present a 60-W power amplifier that is linearized using an RF predistorter for multicarrier wideband code-division multiple-access (WCDMA) applications. The proposed RF predistorter is fully composed of RF or analog circuits, and it has a moderate memory effect compensation capability using a delayed third-order intermodulation (IM3) component path. It also includes the IM5 gener... View full abstract»

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  • Hardware Simplification to the Delta Path in a MASH 111 Delta–Sigma Modulator

    Publication Year: 2009, Page(s):270 - 274
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (302 KB) | HTML iconHTML

    A MASH 111 delta-sigma modulator (DSM) is widely used in a fractional-N frequency synthesizer. This brief presents a low-complexity delta-path design in a MASH 111 modulator by simply recoding all carry output signals from accumulators. Compared with the prior approach, the hardware complexity of the proposed delta path is reduced to 53.4% of the prior approach. For frequency synthesizers with lim... View full abstract»

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  • A Fast-Settling Wideband-IF ASK Baseband Circuit for a Wireless Endoscope Capsule

    Publication Year: 2009, Page(s):275 - 279
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (661 KB) | HTML iconHTML

    A novel automatic-gain-control (AGC) architecture utilizing wideband current feedback is proposed for the baseband circuit of a wireless endoscope capsule. The baseband circuit consists of a fast-settling wideband AGC loop and an amplitude-shift-keying demodulator. Additional integrators in the reverse signal path provide negative feedback, bandpass-filtering effect, attenuating low-frequency nois... View full abstract»

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  • A Novel Minimum-Size Activation Function and Its Derivative

    Publication Year: 2009, Page(s):280 - 284
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (237 KB) | HTML iconHTML

    This brief presents two novel architectures, i.e., a nonlinear neural activation function and its derivative. Both are suitable for implementations of neurons in multilayer perceptron networks with an on-chip backpropagation learning algorithm. The activation function proposed shows minimal area and power consumption, can be considered as an approximation to the tanh(nx) function, and can b... View full abstract»

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  • Memory Reduction Methodology for Distributed-Arithmetic-Based DWT/IDWT Exploiting Data Symmetry

    Publication Year: 2009, Page(s):285 - 289
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (423 KB) | HTML iconHTML

    In this brief, we show that by exploiting the inherent symmetry of the discrete wavelet transform (DWT) algorithm and consequently storing only the nonrepetitive combinations of filter coefficients, the size of required memory can be significantly reduced. Subsequently, a memory-efficient architecture for DWT/inverse DWT is proposed. It occupies 6.5-mm2 silicon area and consumes 46.8-mu... View full abstract»

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  • An Efficient Folded Architecture for Lifting-Based Discrete Wavelet Transform

    Publication Year: 2009, Page(s):290 - 294
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    In this brief an efficient folded architecture (EFA) for lifting-based discrete wavelet transform (DWT) is presented. The proposed EFA is based on a novel form of the lifting scheme that is given in this brief. Due to this form, the conventional serial operations of the lifting data flow can be optimized into parallel ones by employing parallel and pipeline techniques. The corresponding optimized ... View full abstract»

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  • Delay Uncertainty Reduction by Gate Splitting

    Publication Year: 2009, Page(s):295 - 299
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (198 KB) | HTML iconHTML

    Traditional timing-variation reduction techniques are only able to decrease gate delay variation by incurring a delay overhead. In this brief, we propose a novel and effective splitting-based variation reduction technique for gates. We developed a new tool called Timing Uncertainty Reduction by Gate Splitting (TURGS), which reduces the timing variations of... View full abstract»

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  • Data Bus Inversion in High-Speed Memory Applications

    Publication Year: 2009, Page(s):300 - 304
    Cited by:  Papers (9)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (591 KB) | HTML iconHTML

    Efforts to reduce high-speed memory interface power have led to the adoption of data bus inversion or bus-invert coding. This study compares two popular algorithms, which seek to limit the number of simultaneously transitioning signals and bias the state of transmitted data toward a preferred binary level, respectively. A new algorithm, which provides a compromise between transition frequency and ... View full abstract»

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  • Lyapunov Theory-Based Multilayered Neural Network

    Publication Year: 2009, Page(s):305 - 309
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB) | HTML iconHTML

    This brief presents a Lyapunov theory-based weight adaptation scheme for a multilayered neural network (MLNN) mainly used to classify a multiple-input-multiple-output (MIMO) problem. Initially, the MLNN system is linearized using Taylor series expansion. Then, the weight adaptation scheme is designed based on the Lyapunov stability theory to iteratively update the weight. In the design, the Lyapun... View full abstract»

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  • Synchronization: An Obstacle to Identification of Network Topology

    Publication Year: 2009, Page(s):310 - 314
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB) | HTML iconHTML

    Identification of network topology is an important issue for physics, biology, engineering, and other science disciplines. Under the application of an adaptive-feedback control algorithm, we explore a process through which the topology of an unknown dynamical network can be identified. Analytical results show that the key to guaranteeing successful topology identification is the existence of the c... View full abstract»

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  • A Local Nonlinear Model for the Approximation and Identification of a Class of Systems

    Publication Year: 2009, Page(s):315 - 319
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (158 KB) | HTML iconHTML

    The special form of the Laplace-domain Volterra kernels for linear-analytic systems is exploited to obtain an approximate model that obeys an appealingly simple feedforward block structure. It comprises a composition of the linearization and the multivariate nonlinear function of the original system. The model does not involve a truncation in the power series expansion nor in the memory depths and... View full abstract»

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  • Improved Global Asymptotical Synchronization of Chaotic Lur'e Systems With Sampled-Data Control

    Publication Year: 2009, Page(s):320 - 324
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (134 KB) | HTML iconHTML

    This brief investigates the global asymptotical synchronization problem of chaotic Lur'e systems with sampled-data control. Based on a time-varying delay system transformed from the sampled-data error system, an augmented Lyapunov functional containing some useful system information is constructed, no useful terms in the derivative of the Lyapunov functional are ignored, and the relationship among... View full abstract»

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  • Passivity Analysis of Neural Networks With Time-Varying Delays

    Publication Year: 2009, Page(s):325 - 329
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (111 KB) | HTML iconHTML

    This brief considers the problem of passivity analysis for neural networks with both time-varying delays and norm-bounded parameter uncertainties. For two types of time-varying delays, delay-dependent passivity conditions are derived, respectively. These conditions are expressed in terms of linear matrix inequalities. An example is provided to show the less conservatism of the proposed conditions. View full abstract»

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  • Simple Design of Detector in the Presence of Frequency Offset for IEEE 802.15.4 LR-WPANs

    Publication Year: 2009, Page(s):330 - 334
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (605 KB) | HTML iconHTML

    A simple detector for orthogonal modulation that is robust to large frequency offsets is proposed. The complexity of the detector is significantly reduced by implementing the correlator using multiplexers instead of complex floating-point multiplications. The performance of this design is comparable to the optimal value obtained by double correlation in offset quadrature phase-shift keying (O-QPSK... View full abstract»

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  • IEEE Transactions on Circuits and Systems—II: Express Briefs Information for authors

    Publication Year: 2009, Page(s): 335
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  • Leading the field since 1884 [advertisement]

    Publication Year: 2009, Page(s): 336
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  • IEEE Circuits and Systems Society Information

    Publication Year: 2009, Page(s): C3
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  • Blank page [back cover]

    Publication Year: 2009, Page(s): C4
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Aims & Scope

Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief

Chi K. Michael Tse
Dept. of Electronic and Information Engineering
Hong Kong Polytechnic University
Hunghom, Hong Kong
cktse@ieee.org