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IEEE Transactions on Circuits and Systems II: Express Briefs

Issue 4 • Date April 2007

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Displaying Results 1 - 24 of 24
  • 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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  • Transformer-Based Dual-Mode Voltage-Controlled Oscillators

    Publication Year: 2007, Page(s):293 - 297
    Cited by:  Papers (56)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB) | HTML iconHTML

    In this brief, we propose to use a transformer-based resonator to build a dual-mode oscillator, e.g., a system capable of oscillating at two different frequencies without recurring to switched inductors, switched capacitors, or varactors. The behavior of the resonator configured as a one-port and a two-port network is studied analytically, and the dependence of the quality factor on the design par... View full abstract»

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  • Resistance of Feedback Amplifiers: A Novel Representation

    Publication Year: 2007, Page(s):298 - 302
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (159 KB) | HTML iconHTML

    We propose a representation and a related methodology for evaluating the exact input and output resistances of feedback amplifiers. Our approach is based on the generalization of the Rosenstark theorem. Indeed, it requires the computation of two resistances (direct and asymptotic) each one evaluated in one of the two ideal and extreme conditions of the return ratio (zero or infinity). Due to these... View full abstract»

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  • Current-Mode Phase-Locked Loops— A New Architecture

    Publication Year: 2007, Page(s):303 - 307
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB) | HTML iconHTML

    This brief introduces current-mode phase-locked loops (PLLs). The proposed current-mode PLLs differ from conventional voltage-mode PLLs by replacing their RC loop filter with a RL loop filter, eliminating the need for large on-chip capacitors. The large inductance of the current-mode loop filter is obtained from CMOS active inductors, taking the advantage of their large and tunable inductance and ... View full abstract»

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  • Automatic Tuning of Time Constants in Continuous-Time Delta–Sigma Modulators

    Publication Year: 2007, Page(s):308 - 312
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB) | HTML iconHTML

    We describe a digital technique for estimating and correcting time constant shifts in continuous-time delta-sigma modulators. The proposed method is based on the principle that the in-band gain and the out-of-band performance of a modulator are related. If the modulator output is denoted as v(n), we show that the variance of p(n)equivv(n)-v(n-1) is a good indicator of the modulator RC time constan... View full abstract»

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  • An Injection-Locked Frequency Divider With Multiple Highly Nonlinear Injection Stages and Large Division Ratios

    Publication Year: 2007, Page(s):313 - 317
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (498 KB) | HTML iconHTML

    An injection-locked frequency divider (ILFD) with multiple highly nonlinear injection stages is discussed. Implemented in a standard 0.18-mum CMOS technology, measurement shows that multiple division ratios from 6 to 18 are achieved while the locking ranges are all above 1.7 GHz without the need for additional tuning. The ILFD can be locked at the maximum injection frequency of 11 GHz with the pow... View full abstract»

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  • Low-Power Cache Design Using 7T SRAM Cell

    Publication Year: 2007, Page(s):318 - 322
    Cited by:  Papers (49)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB) | HTML iconHTML

    On-chip cache consumes a large percentage of the whole chip area and expected to increase in advanced technologies. Charging/discharging large bit lines capacitance represents a large portion of power consumption during a write operation. We propose a novel write mechanism which depends only on one of the two bit lines to perform a write operation. Therefore, the proposed 7T SRAM cell reduces the ... View full abstract»

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  • A Power-Efficient 5.6-GHz Process-Compensated CMOS Frequency Divider

    Publication Year: 2007, Page(s):323 - 327
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB) | HTML iconHTML

    This brief presents a robust, power efficient CMOS frequency divider for the 5-GHz UNII band. The divider operates as a voltage controlled ring oscillator with the output frequency modulated by the switching of the input transmission gate. The divider, designed in a 0.25-mum SOS-CMOS technology, occupies 35times25 mum2 and exhibit a operating frequency of 5.6 GHz while consuming 79 muW ... View full abstract»

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  • Segmented Group-Inversion Coding for Parallel Links

    Publication Year: 2007, Page(s):328 - 332
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB) | HTML iconHTML

    A new segmented group-inversion coding is proposed to achieve current balancing in single-ended parallel data transmission. With minimal increase in number of pins, the proposed coding reduces the difference between the number of ZEROs and ONEs to only 0 or 2. Since the proposed coding is a simple inversion-or-not transformation of pre-defined groups of binary data, it can be implemented with grea... View full abstract»

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  • Periodic, Strict, and Quasi-Invariance in Linear Systems

    Publication Year: 2007, Page(s):333 - 337
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB) | HTML iconHTML

    This brief deals with shift invariance in linear systems (LSs), using a group theoretical approach. The group approach is necessary to obtain general definitions, which can be applied to continuous-time, discrete-time, multirate and also multidimensional LSs. Thus, a unique definition is given for periodic invariance and strict invariance (SI) and also for quasi-invariance (QI), a new concept, int... View full abstract»

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  • Estimation of n Frequencies Using Adaptive Notch Filter

    Publication Year: 2007, Page(s):338 - 342
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB) | HTML iconHTML

    This paper introduces an adaptive structure composed of n coupled paralleled subfilters that directly estimates frequencies of multiple sinusoids. The order of differential equations governing this algorithm is 3n, where n is the number of sinusoids. Stability analysis of this algorithm is carried out based on the application of the averaging theory under the assumption of the slow adaptation. Sim... View full abstract»

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  • On the Application of the Describing Function Technique to the Bifurcation Analysis of Nonlinear Systems

    Publication Year: 2007, Page(s):343 - 347
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    Spectral techniques, like harmonic balance, are classical numerical tools for designing nonlinear oscillators and microwave circuits. Recently these techniques have been exploited for investigating complex dynamics in nonlinear systems. In this manuscript we firstly show that limit cycle Floquet's multipliers and the related bifurcation phenomena can be estimated through a spectral approach, entir... View full abstract»

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  • A Modified Oja–Xu MCA Learning Algorithm and Its Convergence Analysis

    Publication Year: 2007, Page(s):348 - 352
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB) | HTML iconHTML

    The original Oja-Xu minor component analysis (MCA) learning algorithm is not convergent. This brief shows that by modifying Oja-Xu MCA learning algorithm with a normalization step the modified one could be convergent subject to some conditions satisfied. The convergence of the modified MCA learning algorithm is studied by analyzing the convergence of an associated deterministic discrete time syste... View full abstract»

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  • Positivstellensatz for Trigonometric Polynomials and Multidimensional Stability Tests

    Publication Year: 2007, Page(s):353 - 356
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (146 KB) | HTML iconHTML

    We propose a Positivstellensatz for trigonometric polynomials that is simpler than its correspondent for polynomials of real variable. Using it, we give a stability test for multidimensional systems, consisting of checking the feasibility of a linear matrix inequality. The same result is used for a robust stability test for systems whose coefficients depend polynomially on some bounded parameters.... View full abstract»

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  • Reliable {H}_{\infty } Fuzzy Control for a Class of Discrete-Time Nonlinear Systems Using Multiple Fuzzy Lyapunov Functions

    Publication Year: 2007, Page(s):357 - 361
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    This brief deals with the problem of reliable Hinfin fuzzy control for a class of discrete-time nonlinear systems with actuator faults by using multiple fuzzy Lyapunov functions. The Takagi and Sugeno fuzzy model is employed to represent a nonlinear system. A sufficient condition for the existence of reliable Hinfin fuzzy controllers is given in terms of linear matrix inequal... View full abstract»

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  • A Transceiver Front-End for Ultra-Wide-Band Applications

    Publication Year: 2007, Page(s):362 - 366
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1234 KB) | HTML iconHTML

    An integrated pulse based ultra-wide-band (UWB) transceiver front-end is presented in this paper. The pulse generator produces Gaussian modulated pulses satisfying Federal Communication Commission spectral mask with possibility for binary-phase shift keying modulation. The generated pulses have a bandwidth of 2 GHz from 3.1 to 5.1 GHz. The receiver front-end consists of an UWB low-noise amplifier ... View full abstract»

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  • RF I/Q Downconverter With Gain/Phase Calibration

    Publication Year: 2007, Page(s):367 - 371
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB) | HTML iconHTML

    We propose an RF I/Q downconverter including a calibration procedure to compensate for gain and phase mismatch errors. The indirect compensation technique is based on the use of the local oscillator (LO) signal as reference for error measurements. A number of mismatch parameters are first estimated by an algorithm running in the digital signal processing processor following the analog-to-digital c... View full abstract»

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  • Correction to "Iterative Least Squares Design of DC-Leakage Free Paraunitary Cosine Modulated Filter Banks"

    Publication Year: 2007, Page(s): 372
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  • 2007 IEEE International Symposium on Circuits and Systems (ISCAS 2007)

    Publication Year: 2007, Page(s): 373
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    Freely Available from IEEE
  • Special issue on multifunctional circuits and systems for future generations of wireless communications

    Publication Year: 2007, Page(s): 374
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  • Quality without compromise [advertisement]

    Publication Year: 2007, Page(s): 375
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  • IEEE Transactions on Circuits and Systems—II: Express Briefs Information for authors

    Publication Year: 2007, Page(s): 376
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  • IEEE Circuits and Systems Society Information

    Publication Year: 2007, Page(s): C3
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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