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Electronics Letters

Issue 8 • Date April 14 2011

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Displaying Results 1 - 25 of 33
  • In brief

    Publication Year: 2011, Page(s): 474
    IEEE is not the copyright holder of this material | PDF file iconPDF (141 KB)
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  • Interview

    Publication Year: 2011, Page(s): 474
    IEEE is not the copyright holder of this material | PDF file iconPDF (88 KB)
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  • Glaring eye

    Publication Year: 2011, Page(s): 475
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (371 KB)

    Glare sensing chips are used for any device that needs to detect the occurrence and location of a very bright light source. The glare sensing chips developed by Professor Albert Titus and the team provide location information so that the system knows where the glare source is in the field of view. For the selective dimming sunglasses the group developed, the advantage of glare sensors in general i... View full abstract»

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  • A controlled recovery

    Publication Year: 2011, Page(s): 476
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    In transformer isolated switching converters, the secondary side leakage inductance and the parasitic capacitance of the switches form a resonant RLC network with low damping. Without countermeasures, this will result in ringing (unwanted oscillations) during every switch transition and high amplitude voltage spikes on the switching nodes. Voltage clamps limit the amplitude of these spikes, either... View full abstract»

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  • Compact strip-monopole antenna for WLAN-band USB dongle application

    Publication Year: 2011, Page(s):479 - 480
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    A simple printed strip-monopole antenna suitable for wireless universal serial bus (USB) dongle application is presented. The proposed antenna, comprising a folded-strip radiator and a rectangle ground, has a compact size of only 10×37×mm2 and is capable of generating two resonances with good impedance matching conditions. Prototypes of the proposed antenna have been const... View full abstract»

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  • Strategy of finding optimal number of features on gene expression data

    Publication Year: 2011, Page(s):480 - 482
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (833 KB)

    Feature selection is considered to be an important step in the analysis of transcriptomes or gene expression data. Carrying out feature selection reduces the curse of the dimensionality problem and improves the interpretability of the problem. Numerous feature selection methods have been proposed in the literature and these methods rank the genes in order of their relative importance. However, mos... View full abstract»

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  • Characteristics of solid state drives in designing I/O scheduler

    Publication Year: 2011, Page(s):482 - 483
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (226 KB)

    An efficient I/O scheduling scheme for solid state drives is presented. The proposed scheme fully exploits the characteristics of solid state drives: no data access overhead and asymmetric read and write performance. Through implementation on Linux operating systems, it is shown that the proposed scheme significantly improves the performance of I/O subsystems for solid state drives. View full abstract»

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  • SPICE-compatible modelling technique for simulating floating-gate transistors

    Publication Year: 2011, Page(s):483 - 485
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    A technique is introduced to enable the simulation of floating-gate transistors within standard analogue circuit simulators, such as SPICE. This technique can be used in all types of circuit simulations, ranging from DC sweeps to charge-modification scenarios. The technique is then used to simulate several analogue circuits, the results of which show strong agreement with identical circuits fabric... View full abstract»

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  • Three-dimensional SRAM design with on-chip access time measurement

    Publication Year: 2011, Page(s):485 - 486
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    An SRAM design in a 3D 0.18 m silicon-on-insulator technology is presented. A novel delay-locked loop based access time measurement circuit was designed on-chip for accurately evaluating the 3D SRAM performance. Results show that a 32 improvement in the access time is gained by using 3D technology. View full abstract»

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  • Fabrication of robust PbLa(Zr,Ti)O>3 capacitor structures using insulating oxide encapsulation layers for FeRAM integration

    Publication Year: 2011, Page(s):486 - 487
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (171 KB)

    Various encapsulation oxide thin films of 20 nm Al2O3, HfO2, Bi3Ti4O12 (bismuth titanate, BIT), ZrO2 and SiO2 on the Pt top electrodes and sol-gel derived ferroelectric PbLaZrTiOx (PLZT) capacitors were prepared, and then the hydrogen barrier characteristics were investigated by electrical properties... View full abstract»

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  • Improved fast LBG training algorithm in Hadamard domain

    Publication Year: 2011, Page(s):488 - 489
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (101 KB)

    To reduce computational complexity of the Linde-Buzo-Gray (LBG) algorithm, an improved fast training method in the Hadamard domain is proposed. This method uses an optimally-ordered Hadamard transform kernel based on the statistical energy distribution of transformed training vectors in k-dimensional space and a three-step elimination criterion to more efficiently reject impossible codevect... View full abstract»

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  • Improving feature selection algorithms using normalised feature histograms

    Publication Year: 2011, Page(s):490 - 491
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (146 KB)

    The proposed feature selection method builds a histogram of the most stable features from random subsets of a training set and ranks the features based on a classifier based cross-validation. This approach reduces the instability of features obtained by conventional feature selection methods that occur with variation in training data and selection criteria. Classification results on four microarra... View full abstract»

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  • Bjorck sequence sets

    Publication Year: 2011, Page(s):491 - 493
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

    Constant amplitude zero autocorrelation (CAZAC) sequences are increasingly used in new communication systems (e.g. LTE, WiMax). The (unique) Björck sequence whose length P is an odd prime is a less known CAZAC sequence. By modifying the Björck sequence through CAZAC transformations, a Björck set of P orthogonal sequences is introduced. The maximum absolute set... View full abstract»

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  • Estimation of mutual information using copula density function

    Publication Year: 2011, Page(s):493 - 494
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (112 KB)

    The dependence between random variables may be measured by mutual information. However, the estimation of mutual information is difficult since the estimation of the joint probability density function (PDF) of non-Gaussian distributed data is a hard problem. Copulas offer a natural approach for estimating mutual information, since the joint probability density function of random variables can be e... View full abstract»

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  • Gamma-filter self-organising neural networks for unsupervised sequence processing

    Publication Year: 2011, Page(s):494 - 496
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (338 KB)

    Adding γ-filters to self-organising neural networks for unsupervised sequence processing is proposed. The proposed γ-context model is applied to self-organising maps and neural gas networks. The γ-context model is a generalisation that includes as a particular example the previously published merge-context model. The results show that the γ-context model outperforms the... View full abstract»

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  • Multilevel perfect sequences over integers

    Publication Year: 2011, Page(s):496 - 497
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (68 KB)

    Multilevel perfect sequences over integers are introduced which include the conventional binary perfect sequences as special cases. Such sequences can be derived from multilevel cyclic Hadamard matrices over integers. It is proved that integer-valued perfect sequences of odd lengths with the energy being non-square integers do not exist, and the existence of four-level perfect sequences of lengths... View full abstract»

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  • Resonant cavity integrated absorber structure for capacitive infrared detectors

    Publication Year: 2011, Page(s):497 - 499
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    A novel absorption structure for the capacitive infrared (IR) detectors is proposed. By attaching an IR mirror under the absorber at a distance of λ/4, the resonant cavity structure is established, providing a consistent absorptance of 78λ regardless of the absorber position and the device temperature. View full abstract»

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  • Uniplanar microstrip periodic structure for microwave circuits

    Publication Year: 2011, Page(s):499 - 500
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    A novel microstrip slow-wave structure is presented. The slow-wave factor is mainly controlled by the signal strip and the inserted ground metal pattern in a coplanar manner. A third-order Chebyshev filter was designed and fabricated to demonstrate the proposed structure. Good agreement between the simulated and measured responses is observed. View full abstract»

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  • Compact concavo-convex cavity filters using multilayer substrate integrated waveguide

    Publication Year: 2011, Page(s):500 - 502
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (290 KB)

    A compact bandpass filter based on concavo-convex cavity resonators is proposed. The reported resonator is developed from a conventional rectangular cavity resonator by introducing a concave surface. Compared to a conventional rectangular cavity, this new resonator has a low resonant frequency, compact size and a wider relative mono-mode bandwidth. Using the substrate integrated waveguide techniqu... View full abstract»

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  • Design of quad-band bandpass filter with multiple transmission zeros

    Publication Year: 2011, Page(s):502 - 503
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    A quad-band bandpass filter utilising stub-loaded resonators is presented. The symmetric resonator is analysed by using even-mode and odd-mode technique. The resonator provides one transmission zero and four transmission poles for the four passbands. With the multi-line input/output coupling configuration and multipath propagation between the meandering resonators, one can generate two additional ... View full abstract»

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  • Modulation of monochromatic terahertz radiation in transmission and reflection modes using planar metamaterial

    Publication Year: 2011, Page(s):503 - 505
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (254 KB)

    Electrically tunable metamaterial modulation based on double split-ring resonators fabricated on GaAs substrate is studied experimentally and numerically. Monochromatic terahertz radiation is effectively modulated in transmission and reflection modes; experiments are complemented by measurements employing time-domain terahertz spectroscopy. Upper modulation frequency was found at 10 kHz. View full abstract»

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  • Compact bandstop filter using coupled-line section

    Publication Year: 2011, Page(s):505 - 506
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (441 KB)

    A new compact bandstop filter with a coupled-line structure is proposed. Stopband rejection depth and bandwidth can be controlled by the configuration of the coupling section, and good return loss is realised by properly adjusting the impedances of two open-circuited stubs. Design equations are obtained using a lossless transmission line model. To validate the analysis, a bandstop filter with abou... View full abstract»

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  • Properties of metallic microwave-scale Mach-Zehnder interferometers for dielectric resonator tuning

    Publication Year: 2011, Page(s):506 - 508
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    Modulation of the properties of metallic microwave-scale Mach-Zehnder interferometers (MZI) coupled to dielectric resonators (DR) may be used to tune the resonance frequency of the latter. A report is presented on a theoretical study of the intrinsic tuning properties of a MZI-DR-transmission line system, of the type employed in DR oscillators, in particular, the tuning range and quality factor. View full abstract»

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  • Autonomous low-power glare sensing chip

    Publication Year: 2011, Page(s):508 - 509
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    A custom-designed CMOS glare sensing chip is presented that can operate without external control. The chip is a 64×32 pixel focal-plane array that checks periodically for the presence of glare×a light intensity greater than a predefined threshold. If glare is present, the chip wakes up an external microcontroller, which takes control of the chip and reads out the precise glare locati... View full abstract»

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  • Combination of phase modulation and coding for SNR enhancement in distributed Brillouin sensors

    Publication Year: 2011, Page(s):509 - 510
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (181 KB)

    This reported work proposes and demonstrates the benefits of a phase-coded pump using Simplex code into a distributed strain sensor based on Brillouin optical-fibre time-domain analysis technique. It is considered that the experimental results show significant signal-to-noise ratio (SNR) enhancement provided by an increasing length of the phase-coded pump with short code length (7 to 31 bits), thu... View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK