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IEEE Transactions on Circuits and Systems II: Express Briefs

Issue 9 • Date Sept. 2005

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Displaying Results 1 - 25 of 28
  • Table of contents

    Publication Year: 2005, Page(s): c1
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

    Publication Year: 2005, Page(s): c2
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  • A mixed time-frequency-domain approach for the analysis of a hysteretic oscillator

    Publication Year: 2005, Page(s):525 - 529
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB) | HTML iconHTML

    The global dynamic behavior of a hysteretic oscillator is investigated. It is shown that the most significant bifurcation phenomena can be accurately detected through the joint application of two frequency-domain techniques, i.e., describing function and harmonic balance, and of a suitable time-domain method for computing limit-cycle Floquet's multipliers. The proposed approach can be effectively ... View full abstract»

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  • A trigonometric formulation of the LMS algorithm for realization on pipelined CORDIC

    Publication Year: 2005, Page(s):530 - 534
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB) | HTML iconHTML

    This paper presents an alternate formulation of the least mean square (LMS) algorithm by using a set of angle variables monotonically related to the filter coefficients. The algorithm updates the angles directly instead of the filter coefficients and relies on quantities that can be realized by simple CORDIC rotations. Two architectures based on pipelined CORDIC unit are proposed which achieve eff... View full abstract»

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  • Warped discrete cosine transform-based noisy speech enhancement

    Publication Year: 2005, Page(s):535 - 539
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB) | HTML iconHTML

    In this paper, a warped discrete cosine transform (WDCT)-based approach to enhance the degraded speech under background noise environments is proposed. For developing an effective expression of the frequency characteristics of the input speech, the variable frequency warping filter is applied to the conventional discrete cosine transform (DCT). The frequency warping control parameter is adjusted a... View full abstract»

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  • Control for stability and positivity: equivalent conditions and computation

    Publication Year: 2005, Page(s):540 - 544
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    This paper investigates the stabilizability of linear systems with closed-loop positivity. A necessary and sufficient condition for the existence of desired state-feedback controllers guaranteeing the resultant closed-loop system to be asymptotically stable and positive is obtained. Both continuous and discrete-time cases are considered, and all of the conditions are expressed as linear matrix ine... View full abstract»

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  • Optimization of MOS amplifier performance through channel length and inversion level selection

    Publication Year: 2005, Page(s):545 - 549
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    The dependence of MOS amplifier performance on channel length and channel inversion is simulated and discussed. Suggestions are made regarding the optimization of voltage gain, nonlinear distortion and the gain-bandwidth product (GBW) through careful device length and inversion level selection. The midband voltage gain of the common-source amplifier is shown to remain relatively constant when bias... View full abstract»

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  • On Brayton and Moser's missing stability theorem

    Publication Year: 2005, Page(s):550 - 552
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB) | HTML iconHTML

    In the early 1960s, Brayton and Moser proved three theorems concerning the stability of nonlinear electrical circuits. The applicability of each theorem depends on three different conditions on the type of admissible nonlinearities in circuit. Roughly speaking, this means that the theorems apply to either circuits that contain purely linear resistors or conductors-combined with linear or nonlinear... View full abstract»

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  • Multiple integration method for a high signal-to-noise ratio readout integrated circuit

    Publication Year: 2005, Page(s):553 - 557
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB) | HTML iconHTML

    A multiple integration method is reported that greatly improves the signal-to-noise ratio (SNR) for applications with a high-resolution infrared (IR) focal plane array. The signal from each pixel is repeatedly sampled into an integration capacitor and then output and summed into an outside memory that continues for n read cycles during each period of a frame. This method increases the effective ca... View full abstract»

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  • Bio-inspired compact cell circuit for reaction-diffusion systems

    Publication Year: 2005, Page(s):558 - 562
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB) | HTML iconHTML

    A bio-inspired MOS cell design for reaction-diffusion systems with corresponding single-layer cellular neural network (CNN) implementation is presented. The resulting network layer is introduced and approximate theoretical analysis of its certain dc characteristics is given. A test chip which includes a two-dimensional array of 10 × 9 cells is fabricated. The test chip also houses stand-alon... View full abstract»

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  • Design of low-power analog drivers based on slew-rate enhancement circuits for CMOS low-dropout regulators

    Publication Year: 2005, Page(s):563 - 567
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB) | HTML iconHTML

    Low-power analog driver based on a single-stage amplifier with an embedded current-detection slew-rate enhancement (SRE) circuit is presented. By developing a systematic way to design both the response time and optimal sizing of driving transistors in the SRE circuit, the SRE circuit can be controlled to turn on or turn off properly. In addition, the analog driver only dissipates low static power ... View full abstract»

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  • On minor prime factorizations for n-D polynomial matrices

    Publication Year: 2005, Page(s):568 - 571
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    A tractable criterion is presented for the existence of minor prime factorizations for a class of multidimensional (n-D) (n>2) polynomial matrices whose reduced minors and greatest common divisors have some common zeros. We also present a constructive method for carrying out the minor prime factorizations when they exist. The proposed method is further extended to a larger class of n-D polynomial ... View full abstract»

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  • Design approach using tunnel diodes for lowering power in differential comparators

    Publication Year: 2005, Page(s):572 - 575
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    Adding two clocked tunnel diode pairs to the output ports of a differential amplifier enables high-speed current-mode switching at a lower tail current than in a transistor-only differential pair. The addition of the tunnel diodes also lowers the output open-circuit time constant of the differential pair leading to faster switching speed. As a design example, a return-to-zero D flip-flop is simula... View full abstract»

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  • Quantization of FIR filters under a total integer cost constraint

    Publication Year: 2005, Page(s):576 - 580
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB) | HTML iconHTML

    In this paper, we present computationally efficient algorithms for obtaining a particular class of optimal quantized representations of finite-impulse response (FIR) filters. We consider a scenario where each quantization level is associated with a certain integer cost and, given an FIR filter with real coefficients, our goal is to find the quantized representation that minimizes a certain error c... View full abstract»

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  • Connecting border collision with saddle-node bifurcation in switched dynamical systems

    Publication Year: 2005, Page(s):581 - 585
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    Switched dynamical systems are known to exhibit border collision, in which a particular operation is terminated and a new operation is assumed as one or more parameters are varied. In this brief, we report a subtle relation between border collision and saddle-node bifurcation in such systems. Our main finding is that the border collision and the saddle-node bifurcation are actually linked together... View full abstract»

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  • Nash games for multiparameter singularly perturbed systems with uncertain small singular perturbation parameters

    Publication Year: 2005, Page(s):586 - 590
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB) | HTML iconHTML

    In this paper, the linear quadratic Nash games for infinite horizon multiparameter singularly perturbed systems with uncertain singular perturbation parameters are discussed. The main contribution is that a construction of high-order approximations to a strategy that guarantees a desired performance level on the basis of the successive approximation is proposed. It is newly shown that the proposed... View full abstract»

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  • High-performance error amplifier for fast transient DC-DC converters

    Publication Year: 2005, Page(s):591 - 595
    Cited by:  Papers (32)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB) | HTML iconHTML

    A new error amplifier is presented for fast transient response of dc-dc converters. The amplifier has low quiescent current to achieve high power conversion efficiency, but it can supply sufficient current during large-signal operation. Two comparators detect large-signal variations, and turn on extra current supplier if necessary. The amount of extra current is well controlled, so that the system... View full abstract»

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  • TSK-based decision feedback equalizer using an evolutionary algorithm applied to QAM communication systems

    Publication Year: 2005, Page(s):596 - 600
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB) | HTML iconHTML

    A Takagi-Sugeno-Kang (TSK) fuzzy-based decision feedback equalizer (DFE) applied to detecting a quadrature-amplitude-modulation (QAM) signal is presented. The structure of a TSK fuzzy system may produce many local minimum of involved cost functions for detecting received signals. An evolutionary algorithm is adopted for the proposed TSK fuzzy equalizer to overcome the difficulty for locating globa... View full abstract»

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  • Design of FIR digital filters with prescribed flatness and peak error constraints using second-order cone programming

    Publication Year: 2005, Page(s):601 - 605
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB) | HTML iconHTML

    This paper studies the design of digital finite impulse response (FIR) filters with prescribed flatness and peak design error constraints using second-order cone programming (SOCP). SOCP is a powerful convex optimization method, where linear and convex quadratic inequality constraints can readily be incorporated. It is utilized in this study for the optimal minimax and least squares design of line... View full abstract»

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  • Novel current-mode background suppression for 2-D LWIR applications

    Publication Year: 2005, Page(s):606 - 610
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB) | HTML iconHTML

    A new readout circuit involving two-step current-mode background suppression is studied for two-dimensional long-wavelength infrared focal plane arrays (2-D LWIR FPAs). Buffered direct injection (BDI) and a feedback amplifier are used for the input circuit and background suppression circuit, respectively. The readout circuit has been fabricated using a 0.6-μm 2-poly 3-metal CMOS process for a 6... View full abstract»

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  • A novel FPGA compliant micropipeline

    Publication Year: 2005, Page(s):611 - 615
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB) | HTML iconHTML

    In this paper, it has been demonstrated that the concept of micropipeline which is native to full custom design can be imported to a traditionally synchronous environment of field-programmable gate arrays (FPGAs) by introducing delay pads which are implemented with a special technology-independent circuit called single-inverter ring oscillator. The delay pad can be customized with the help of a di... View full abstract»

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  • Special issue on advances on life science systems and applications

    Publication Year: 2005, Page(s): 616
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  • Special issue on smart sensors

    Publication Year: 2005, Page(s): 617
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  • 2006 IEEE International Symposium on Circuits and Systems (ISCAS 2006)

    Publication Year: 2005, Page(s): 618
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  • 2006 IEEE International Conference on Multimedia and Expo (ICME)

    Publication Year: 2005, Page(s): 619
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    Freely Available from IEEE

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