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By Topic

Electronics Letters

Issue 13 • June 19 2014

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Displaying Results 1 - 25 of 37
  • In brief

    Publication Year: 2014, Page(s): 902
    IEEE is not the copyright holder of this material | PDF file iconPDF (78 KB)
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  • Interview

    Publication Year: 2014, Page(s): 902
    IEEE is not the copyright holder of this material | PDF file iconPDF (163 KB)
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  • Feeling the heat

    Publication Year: 2014, Page(s): 903
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    The introduction of 4G for higher data rates in mobile communication has created a new need for frequency reconfigurable or tunable antennas. To support 4G, new frequency bands needed to be defined. The bands available varied by region so that in total, 40 different bands have been defined for 4G use across the world. Globetrotters have come to expect to use their mobile phone wherever they go, bu... View full abstract»

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  • Bump ahead

    Publication Year: 2014, Page(s): 904
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (954 KB)

    A bump circuit with flexible tuning ability that uses 500 times less power and is smaller than previous circuits has been demonstrated by researchers at the University of Tennessee in the US. The challenges and requirements of the analogue deep-learning system inspired the authors to come up with this radically new design. They implemented the bump circuit by preceding the current correlator with ... View full abstract»

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  • Metallic short backfire antenna with halved size and wideband characteristics

    Publication Year: 2014, Page(s):907 - 908
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (696 KB)

    A short backfire antenna is proposed for 5.2/5.8 GHz wireless local area network (WLAN) applications. Wideband impedance matching is achieved by employing a truncated monopole as the exciter. Moreover, power-handling capability could be enhanced by the all-metallic configuration. The proposed antenna with halved size has two configurations when placed on a ground plane to meet the demands for diff... View full abstract»

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  • Axially symmetric dual-reflectarray antennas

    Publication Year: 2014, Page(s):908 - 910
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (467 KB)

    An axially symmetric dual-reflectarray antenna is proposed. A main reflectarray is designed to mimic a paraboloidal main reflector, and a sub-reflectarray is designed to mimic a hyperboloidal or an ellipsoidal sub-reflector. The dual-reflectarray antenna is more compact than the conventional curved dual reflector. The dual-reflectarray antenna is designed at W-band and compared with its equivalent... View full abstract»

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  • Generalised loading algorithm for adaptive beamforming in ULAs

    Publication Year: 2014, Page(s):910 - 912
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (334 KB)

    A new method for adaptive beamforming in uniform linear arrays (ULAs) is introduced. The proposed method is based on generalised loading of the covariance matrix of the data vector received by the array. The covariance matrix is loaded with a Hermitian matrix which is chosen to shape the directional response of the array. Simulation results show that the proposed approach offers better handling of... View full abstract»

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  • Multi-functional high-isolation dual antenna for controllable wireless charging and NFC communication

    Publication Year: 2014, Page(s):912 - 913
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (379 KB)

    For stable wireless charging and reliable data communications in mobile devices, the proposed high-isolation dual antenna operates at two different frequency bands such as 6.78 MHz at wireless charging and 13.56 MHz at near-field communication (NFC). To increase the isolation between antennas, the proposed dual antenna has an antiparallel coil structure. It has achieved approximately more than 20 ... View full abstract»

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  • Orthogonal projection based asymmetric multi-way relaying with antenna subset selection

    Publication Year: 2014, Page(s):914 - 916
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (143 KB)

    An asymmetric multi-way relay communication scheme using orthogonal projection and analogue network coding is proposed. The scheme is designed for the wireless sensor network, where one sink node (SN) exchanges information with multiple user nodes via a relay station and both the SN and user nodes have low complexity structures. It has been observed that the minimal number of the relay antennas ca... View full abstract»

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  • Printed frequency selective surfaces on textiles

    Publication Year: 2014, Page(s):916 - 917
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (506 KB)

    A novel technique for inkjet printing frequency selective surfaces (FSSs) on textiles is introduced. The challenge of printing an inkjet layer of 3 μm thickness on polyester cotton with a surface roughness of the order of 150 μm is achieved with a screen-printed interface layer. The conducting inkjet layer is then printed directly on top of the interface layer. A screen mask was used... View full abstract»

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  • Thermal loss in high-Q antennas

    Publication Year: 2014, Page(s):917 - 919
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (187 KB)

    Tunable antennas are very promising for future generations of mobile communications, where antennas are required to cover a wide range of operating bands. This reported work was aimed at characterising the loss mechanism of tunable antennas. Tunable antennas typically exhibit a high quality factor (Q), which can lead to thermal loss due to the conductivity of the metal. The investigation sh... View full abstract»

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  • Use of shapley value for selecting centres in RBF neural regressors

    Publication Year: 2014, Page(s):919 - 921
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (155 KB)

    The problem of centre selection in radial basis function neural networks (RBFNNs) is re-examined and tackled through a cooperative game theoretic perspective. By resorting to the notion of Shapley value, the approach ranks candidate centres (modelled as game players) for the RBFNN's hidden layer based on a sampled estimation of their marginal contribution to the cross-validation training error. Re... View full abstract»

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  • Nano-power tunable bump circuit using wide-input-range pseudo-differential transconductor

    Publication Year: 2014, Page(s):921 - 923
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (861 KB)

    An ultra-low-power tunable bump circuit is presented. It incorporates a novel wide-input-range tunable pseudo-differential transconductor linearised using the drain resistances of saturated transistors. Measurement results show that the transconductor has a 5 V differential input range with <;20% of linearity error. The bump circuit demonstrates tunability of the centre, width and height, consu... View full abstract»

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  • Transient-based conversion matrix approach for nonlinear stability analysis

    Publication Year: 2014, Page(s):923 - 925
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    A new methodology aimed at assessing the large-signal stability of nonlinear driven circuits in the large-signal regime is presented. The procedure combines the conversion matrix approach with a transient envelope simulation and can be implemented with most commercial nonlinear microwave CAD tools. A method for the analysis of the onset of spurious oscillation in nonlinear circuits operating in la... View full abstract»

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  • Design and comparison of flipped active inductors with high quality factors

    Publication Year: 2014, Page(s):925 - 927
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    A new design based on the flipped-structure for RF active inductors is presented. The conventional flipped-active inductor (FAI) composed of only two transistors is considered as a starting structure. However, it suffers from low-voltage swing, which increases the nonlinearity. Additionally, it requires high power consumption to achieve adequate inductance and quality factor values. A circuit topo... View full abstract»

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  • Efficiency-enhanced self-biased PA driver for multi-standard applications

    Publication Year: 2014, Page(s):927 - 928
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    An efficiency-enhanced multiband power amplifier (PA) driver is proposed. It introduces a self-biasing circuit and improved switch-capacitor banks to enhance the efficiency. The presented PA driver has been implemented in 65 nm CMOS technology. Measurement results demonstrate a broad frequency coverage of 0.7-5.6 GHz and a flat gain within 2 dB variation. The PA driver has an output power above 6 ... View full abstract»

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  • Improving signal to noise of current mode circuits by a cross-coupled current mirror topology

    Publication Year: 2014, Page(s):928 - 930
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    A cross-coupled current mirror topology is presented. This topology increases the gain of a circuit that amplifies a pair of differential currents without increasing its power dissipation. An example circuit employing this current mirroring technique is presented. Gain and noise analyses are provided to show the effectiveness of the proposed topology in decreasing the input-referred noise. The ana... View full abstract»

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  • Single-step glitch-free NAND-based digitally controlled delay lines using dual loops

    Publication Year: 2014, Page(s):930 - 932
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    To remove glitches occurring in NAND-based digitally controlled delay lines (DCDLs), a novel glitch-free architecture is presented. Compared with the previous structures requiring multiple control steps, the proposed DCDL employs a self-delayed inner loop to remove all the glitches by applying a single-step control-code switching, reducing the control complexity remarkably without increasing the m... View full abstract»

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  • Mutation-based compact genetic algorithm for spectroscopy variable selection in determining protein concentration in wheat grain

    Publication Year: 2014, Page(s):932 - 934
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (153 KB)

    Wheat is the third most produced grain in the world after maize and rice. Determining the protein concentration in wheat grain is one of the major challenges for measuring its industrial quality. Samples of wheat can be collected using a spectrophotometer device. The challenge is to associate the energy absorbed by the device with the protein concentration in wheat. The device measures hundreds of... View full abstract»

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  • Poly-Si active matrix organic light-emitting diode pixel circuit with compensation for threshold voltage and mobility variations

    Publication Year: 2014, Page(s):934 - 935
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (351 KB)

    A new pixel circuit and driving method for large-area, high-luminance active matrix organic light-emitting diode (AMOLED) displays were studied to improve the image quality. The AMOLED display was designed with low-temperature poly-silicon thin film transistors (TFTs), which have good stability but poor uniformity. To overcome the uniformity problem, the proposed pixel circuit compensates for vari... View full abstract»

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  • FlRR: fast low-rank representation using Frobenius-norm

    Publication Year: 2014, Page(s):936 - 938
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (91 KB)

    Low-rank representation (LRR) intends to find the representation with lowest rank of a given data set, which can be formulated as a rank-minimisation problem. Since the rank operator is non-convex and discontinuous, most of the recent works use the nuclear norm as a convex relaxation. It is theoretically shown that, under some conditions, the Frobenius-norm-based optimisation problem has a unique ... View full abstract»

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  • Generating unique identifiers for smartphones using software

    Publication Year: 2014, Page(s):938 - 939
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (449 KB)

    A fast and simple technique for reliably fingerprinting smartphones is presented. This technique extracts the fingerprint by capturing the small variation found in digital imaging sensors used in smartphone cameras. These variations are a result of manufacturing variability and, as such, they are different even for identical digital cameras. The main advantage of the technique presented is that it... View full abstract»

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  • Illumination normalisation method using Kolmogorov-Nagumo-based statistics for face recognition

    Publication Year: 2014, Page(s):940 - 942
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (174 KB)

    Illumination compensation has proven to be crucial in many machine vision applications including face recognition. This is especially important in non-controlled scenarios where face illumination is not homogeneous. An extension of the local normalisation (LN) method using Kolmogorov-Nagumo-based statistics to improve face recognition is proposed. The proposed method is a more general framework fo... View full abstract»

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  • Locally linear representation for image clustering

    Publication Year: 2014, Page(s):942 - 943
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (133 KB)

    The construction of the similarity graph plays an essential role in a spectral clustering (SC) algorithm. There exist two popular schemes to construct a similarity graph, i.e. the pairwise distance-based scheme (PDS) and the linear representation-based scheme (LRS). It is notable that the above schemes suffered from some limitations and drawbacks, respectively. Specifically, the PDS is sensitive t... View full abstract»

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  • Unsigned SRT tables: theory and implementation

    Publication Year: 2014, Page(s):943 - 945
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (119 KB)

    The mathematical basis for developing an unsigned SRT table for division, multiplication-division or square-root operations is summarised. This is possible through utilising the P-D diagram symmetry allowing a 50% reduction in table size. Efficient implementation that avoids a serious problem with the implementation suggested by Kornerup in 2003 is demonstrated and conditions for its error-... 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