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Circuits and Systems II: Express Briefs, IEEE Transactions on

Issue 9 • Date Sept. 2007

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Displaying Results 1 - 23 of 23
  • Table of contents

    Publication Year: 2007 , Page(s): C1 - C4
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

    Publication Year: 2007 , Page(s): C2
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  • CMOS High-CMRR Current Output Stages

    Publication Year: 2007 , Page(s): 745 - 749
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (695 KB) |  | HTML iconHTML  

    Two CMOS current output stages are presented. Compared to the traditional solution, which exhibits unbalanced operation, the proposed ones exploit an auxiliary high-gain feedback loop which provides differential drive, thereby highly improving the common-mode rejection ratio (CMRR). Prototypes are designed and fabricated in a 0.35-mum technology and experimental results confirm that a CMRR increas... View full abstract»

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  • A Wide Locking-Range Frequency Divider for LMDS Applications

    Publication Year: 2007 , Page(s): 750 - 754
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1718 KB) |  | HTML iconHTML  

    A fully integrated frequency divider with an operation frequency up to 20 GHz is designed in 0.18-mum CMOS technology. The frequency divider includes two stages to divide the input signal by a factor of 4. A wide locking range from 18.8 to 23.2 GHz was obtained with a low phase noise of -134.8 dBc/Hz (1-MHz offset) at an output frequency of 4.7 GHz. The first stage is designed by an analog methodo... View full abstract»

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  • A High Slew-Rate Push–Pull Output Amplifier for Low-Quiescent Current Low-Dropout Regulators With Transient-Response Improvement

    Publication Year: 2007 , Page(s): 755 - 759
    Cited by:  Papers (50)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    A high slew-rate amplifier with push-pull output driving capability is proposed to enable an ultra-low quiescent current (Iq ~ 1muA) low-dropout (LDO) regulator with improved transient responses. The proposed amplifier eliminates the tradeoff between small Iq and large slew-rate that is imposed by the tail-current in conventional amplifier design. Push-pull output stage is introduced to enhance th... View full abstract»

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  • The Stochastic I-Pot: A Circuit Block for Programming Bias Currents

    Publication Year: 2007 , Page(s): 760 - 764
    Cited by:  Papers (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (740 KB) |  | HTML iconHTML  

    In this brief, we present the "stochastic I-Pot." It is a circuit element that allows for digitally programming a precise bias current ranging over many decades, from pico-amperes up to hundreds of micro-amperes. I-Pot blocks can be chained within a chip to allow for any arbitrary number of programmable bias currents. The approach only requires to provide the chip with three external pins, the use... View full abstract»

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  • An ARM-Based System-on-a-Programmable-Chip Architecture for Spoken Language Translation

    Publication Year: 2007 , Page(s): 765 - 769
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1193 KB) |  | HTML iconHTML  

    Previous research shows that there are two architectures for spoken language translation (SLT) system implementation. One is client-server based systems that should be built on the server computer but unreliability of the remote connection. The other is to build portable stand-alone devices but it lacks realtime performance. In this brief, a system-on-a-programmable-chip (SoPC) solution is propose... View full abstract»

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  • Multiplierless, Folded 9/7– 5/3 Wavelet VLSI Architecture

    Publication Year: 2007 , Page(s): 770 - 774
    Cited by:  Papers (18)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (294 KB) |  | HTML iconHTML  

    This brief proposes a multiplierless VLSI architecture for the famous 9/7 wavelet filters. The novelty of this architecture is the possibility to compute the 5/3 wavelet results into the 9/7 data path with a reduced number of adders compared to other solutions. The multiplierless architecture has been characterized in terms of performance through simulations into a JPEG2000 environment and compare... View full abstract»

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  • RNS-To-Binary Converter for a New Three-Moduli Set {2n+1−1,2n,2n−1}

    Publication Year: 2007 , Page(s): 775 - 779
    Cited by:  Papers (24)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (270 KB) |  | HTML iconHTML  

    In this brief, the design of residue number system (RNS) to binary converters for a new powers-of-two related three-moduli set {2n+1 - 1, 2n, 2n - 1} is considered. This moduli set uses moduli of uniform word length (n to n + 1 bits). It is derived from a previously investigated four-moduli set {2n - 1, 2n, 2n + 1, 2n ... View full abstract»

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  • Optimal Use of Some Classical Approximations in Filter Design

    Publication Year: 2007 , Page(s): 780 - 784
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (333 KB) |  | HTML iconHTML  

    The classical Butter worth, Chebyshev and Elliptic (Cauer) low-pass filter approximations can be used in the design of analog and IIR digital filters in such a way as to obtain passband, stopband and transition band optimized filters at no order cost. The exact analytical relationships for such an optimal deployment of these approximations are developed and presented in this paper and their use is... View full abstract»

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  • A Complex Variable Fractional-Delay FIR Filter Structure

    Publication Year: 2007 , Page(s): 785 - 789
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    This brief introduces a structure for complex variable fractional delay (FD) finite-length impulse response (FIR) filters. The structure is derived from a real variable FD FIR filter and is constituted by a set of fixed real linear-phase FIR filters and two multiply-accumulate chains containing variable multipliers. In this way the implementation complexity and delay may be reduced in comparison w... View full abstract»

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  • Polyphase Conditions and Structures for 2-D Quincunx FIR Filter Banks Having Quadrantal or Diagonal Symmetries

    Publication Year: 2007 , Page(s): 790 - 794
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (362 KB) |  | HTML iconHTML  

    In this brief, we derive conditions on the polyphase matrix of 2-D finite-impulse response (FIR) quincunx filter banks, for the filters in the filter bank to have quadrantal or diagonal symmetry. These conditions provide a framework for synthesizing polyphase structures which structurally enforce the symmetry. This is demonstrated by constructing examples of small parameterized matrix structures w... View full abstract»

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  • More on Security of Public-Key Cryptosystems Based on Chebyshev Polynomials

    Publication Year: 2007 , Page(s): 795 - 799
    Cited by:  Papers (9)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (138 KB) |  | HTML iconHTML  

    Recently, a public-key cryptosystem based on Chebyshev polynomials has been proposed, but it has been later analyzed and shown insecure. This paper addresses some unanswered questions about the cryptosystem. We deal with the issue of computational precision. This is important for two reasons. Firstly, the cryptosystem is defined on real numbers, but any practical data communication channel can onl... View full abstract»

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  • Remarks on Analysis, Design and Amplitude Stability of MOS Colpitts Oscillator

    Publication Year: 2007 , Page(s): 800 - 804
    Cited by:  Papers (12)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (329 KB) |  | HTML iconHTML  

    The small-signal analysis shows that the MOS Colpitts oscillator is described by a third order characteristic equation. The procedure for finding the second order approximation is defined, and the solution corresponding to this approximation is found. Then the equations for transistor transconductance describing function are analyzed, and the design procedure corresponding to the "convenient" oper... View full abstract»

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  • Control of Fast Scale Bifurcations in Power-Factor Correction Converters

    Publication Year: 2007 , Page(s): 805 - 809
    Cited by:  Papers (27)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (263 KB) |  | HTML iconHTML  

    This brief proposes a novel controller which greatly enhances the performance of a power-factor correction converter. This controller is optimally tuned to place the eigenvalues of the system well inside the unit circle and hence it guarantees stable operation over a wide range of input voltages. The design of the controller is based on the stability analysis of the system using the state transiti... View full abstract»

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  • Active Q-Factor and Equilibrium Stability Formulation for Sinusoidal Oscillators

    Publication Year: 2007 , Page(s): 810 - 814
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (167 KB) |  | HTML iconHTML  

    Quality factor (Q-factor) and stability criterion of sinusoidal oscillators are formulated from the viewpoints of energy equilibrium and spectrum purity. Complex power works as an objective function to determine the steady-state oscillation amplitude and frequency. Conjugate product of amplitude and frequency slopes of the function dominates equilibrium stability. Logarithmic derivative of oscilla... View full abstract»

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  • IP Observer Design for Descriptor Linear Systems

    Publication Year: 2007 , Page(s): 815 - 819
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    The new type of integral proportional (IP) observers for descriptor linear systems is proposed. Based on a parametric solution to a type of matrix equations, a parametric approach for the design of the IP observers is established. The proposed approach guarantees the regularity of the observer systems, and gives parameterizations of all observer gains in terms of some free parameters. View full abstract»

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  • A Subsampling Quadrature Σ∆ Modulator Based on Distributed Resonators for Use in Radio Receiver

    Publication Year: 2007 , Page(s): 820 - 824
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    The receiver architecture proposed in this brief seizes the subsampling properties of continuous-time sigma-delta (SigmaDelta) modulators based on distributed resonators to construct a quadrature receiver. The proposed architecture is based on a low-pass SigmaDelta modulator that subsamples an intermediate frequency signal around the sampling frequency and does not require quadrature mixers. Inste... View full abstract»

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  • Fast-Transient PCCM Switching Converter With Freewheel Switching Control

    Publication Year: 2007 , Page(s): 825 - 829
    Cited by:  Papers (17)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1018 KB) |  | HTML iconHTML  

    This brief presents a new switching converter operating in pseudo-continuous-conduction mode (PCCM) with freewheel switching control. Compared with conventional discontinuous-conduction mode (DCM) converters, this converter demonstrates much improved current handling capability with reduced current and voltage ripples. The control-to-output transfer function exhibits a single-pole behavior, making... View full abstract»

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  • Special issue on multifunctional circuits and systems for future generations of wireless communications

    Publication Year: 2007 , Page(s): 830
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  • 2008 IEEE International Symposium on Circuits and Systems-engineering the environmental revolution (ISCAS 2008)

    Publication Year: 2007 , Page(s): 831
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs Information for authors

    Publication Year: 2007 , Page(s): 832
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  • IEEE Circuits and Systems Society Information

    Publication Year: 2007 , Page(s): C3
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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