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Electronics Letters

Issue 4 • Feb. 14 2013

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Displaying Results 1 - 25 of 47
  • In brief

    Publication Year: 2013, Page(s): 234
    IEEE is not the copyright holder of this material | PDF file iconPDF (85 KB)
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  • Interview

    Publication Year: 2013, Page(s): 234
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (99 KB)

    Professor David Shapiro and Dr Elena Shapiro from the Institute of Automation and Electrometry (Novosibirsk) talk about the research behind the Letter 'Narrow optical filtering in phase modulated communication links' on page 279. View full abstract»

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  • Power squared

    Publication Year: 2013, Page(s): 235
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (333 KB)

    Researchers in Germany present an 825 GHz traveling wave tube design with square helix slow wave structure, including input and output couplings. As well as being manufacturable, simulations suggest the design could boost solid-state THz source power outputs by more than an order of magnitude. View full abstract»

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  • Showing real nerve

    Publication Year: 2013, Page(s): 236
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (135 KB)

    Researchers at the University of Calgary in Canada have experimentally demonstrated distortions arising from dual-band concurrent operation and modulator imperfections in a transmitter. To address this, they have proposed a neural network based digital pre-distortion (DPD) scheme, which will mitigate the effect of the distortions and that of the hardware imperfections in a single step. As well as ... View full abstract»

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  • Broadband Fabry-P??rot radiation based on non-foster cavity boundary

    Publication Year: 2013, Page(s):239 - 240
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    Fabry-Pérot (FP) cavities having at least one partially reflective surface are widely used as compact and efficient high-directivity radiators. However, they inherently suffer from very narrow directivity bandwidths around the FP resonance. Here it is shown that this constraint can be overcome by using an active non-Foster cavity boundary behaving as a series negative LC tank circuit. Anal... View full abstract»

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  • Combined RFID tag antenna for recipients containing liquids

    Publication Year: 2013, Page(s):240 - 242
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (201 KB)

    In UHF RFID (radio frequency identification), passive tag antennas can be fixed on boxes or recipients where the nature and contents might vary. These variations strongly affect the antenna performance. A combined antenna is proposed to ensure an effective read-range for a plastic recipient containing water or not. Two separate antennas are first designed for the filled and unfilled cases, respect... View full abstract»

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  • Cylindrical high impedance surface aided horizontally polarised omnidirectional antenna

    Publication Year: 2013, Page(s):242 - 243
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (250 KB)

    Cylindrical high impedance surface (HIS) structures and their E-plane omnidirectional antenna application are presented at the 2.0 GHz band. The diameter of the cylinder is 39.2 mm, when the φ-direction periodicity is chosen as three. The HIS, when illuminated by plane waves, not only reflects them in the direction of arrival with zero phase, but also transmits them in other directions to a... View full abstract»

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  • Directional multi-band antenna employing frequency selective surfaces

    Publication Year: 2013, Page(s):243 - 245
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    Proposed is a concept of a directional multi-band antenna employing frequency selective surfaces (FSSs). To confirm the feasibility of the concept, the proposal is implemented by combining a metal reflector, two FSSs that act as frequency filters, and a multi-band radiator. The proposed triple-band antenna can radiate at 800 MHz (the metal reflector or FSS 1), 2 GHz (FSS 2), and 4 GHz (FSS 3). FSS... View full abstract»

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  • Polarisation independent split ring frequency selective surface

    Publication Year: 2013, Page(s):245 - 246
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A frequency selective surface (FSS) is described which exhibits coincident spectral responses for TE and TM polarisation when the FSS operates at 45° incidence. The structure consists of two closely spaced arrays of ring elements with the conductor split at one or two locations to provide independent control of the resonances for the vertical and horizontal field directions. The FSS is desi... View full abstract»

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  • Duty-cycle detector based on time-to-digital conversion

    Publication Year: 2013, Page(s):247 - 248
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    A duty cycle detector based on time-to-digital conversion is presented. It combines the advantages of analogue (high accuracy and simplicity) and digital (digital output) duty cycle correctors in a simple and straightforward topology. Two identical circuits detect the high and low phases of the input clock and deliver two digital words. These two words are then sufficient to accurately estimate th... View full abstract»

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  • SAR ADC architecture with 98% reduction in switching energy over conventional scheme

    Publication Year: 2013, Page(s):248 - 250
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (163 KB)

    A high energy-efficiency switching scheme for a successive approximation register (SAR) analogue-to-digital converter (ADC) is presented. The proposed method can achieve 98.4% savings in switching energy when compared to a conventional SAR. The proposed technique also achieves a 4 % reduction in total capacitance used in the digital-to-analogue converter (DAC) compared to the conventional DAC. View full abstract»

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  • Two-step incremental analogue-to-digital converter

    Publication Year: 2013, Page(s):250 - 251
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    A new incremental ADC (IADC) is proposed which extends the order of a conventional incremental ADC from N to (2N - 1) by way of a two-step operation. For a given conversion time, the duration of each step can be optimised. For an Nth-order IADC, the performance is equivalent to that of a (2N - 1)-order converter. However, it only needs the same circuitry as the N... View full abstract»

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  • Effect of buffer cache on storage performance in virtualised environment

    Publication Year: 2013, Page(s):251 - 253
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    Many researches compare the storage performance of different virtualised systems. Some of their results are unexplained, which reduces the reliability of the storage performance comparison itself. Through experiments, this reported work identifies that the size of buffer cache significantly affects the storage performance. When the same size of buffer cache is used in experiments, very different r... View full abstract»

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  • Joint mitigation of nonlinearity and modulator imperfections in dual-band concurrent transmitter using neural networks

    Publication Year: 2013, Page(s):253 - 255
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (298 KB)

    Reported, for the first time is a predistortion scheme for a concurrent dual-band transmitter with a dual-band concurrent Doherty power amplifier in the presence of modulator I/Q imbalance and DC offsets. Inverse PA modelling for predistortion is achieved using real valued time delayed neural networks. The model has been validated for a 10 W GaN based dual-band concurrent Doherty power amplifier f... View full abstract»

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  • Weighted virtual tangential vector algorithm for local path planning of mobile robots

    Publication Year: 2013, Page(s):255 - 256
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB)

    A real-time path generation method for a mobile robot is newly proposed based on the virtual tangential vector (VTV). The VTV is for imposing a feature to drive a robot along with the tangential direction to a circular obstacle virtually generated in real-time. Subjected to multiple obstacles, a weighted resultant vector of all the VTVs, so-called weighted VTV (WVTV), is defined. Together with the... View full abstract»

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  • Enhanced people detection combining appearance and motion information

    Publication Year: 2013, Page(s):256 - 258
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (419 KB)

    The combination of two of the most recent people detectors from the state of the art is proposed. It is already known that the combination of independent information sources is useful for any detection task. In relation to people detection, there are two main discriminative information sources that characterise a person: appearance and motion. Proposed is the combination of two recent approaches b... View full abstract»

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  • Histograms of local intensity differences for pedestrian classification in far-infrared images

    Publication Year: 2013, Page(s):258 - 260
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Presented is an intensity-based feature extraction method for pedestrian classification in far-infrared (FIR) images. The underlying idea of the method is that only intensity differences between neighbouring pixels can represent both the direction and the magnitude of the gradient, as FIR images are characterised by monotonic grey-level changes. A new intensity-based feature called the histogram o... View full abstract»

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  • Spatial surface coarseness analysis: technique for fingerprint spoof detection

    Publication Year: 2013, Page(s):260 - 261
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    Proposed is a technique for fingerprint spoof detection, the spatial surface coarseness analysis. This approach improves the wavelet analysis of the fingertip surface texture by introducing spatial features to the model. Thus, the accuracy of the fingerprint classification is increased to 70.09% compared with the original solution. View full abstract»

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  • Spectrally efficient multiple-ARQ scheme for MIMO channel

    Publication Year: 2013, Page(s):261 - 263
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (258 KB)

    Proposed is a multiple automatic repeat request (ARQ) scheme for the MIMO channel adopting the structure of space-time block codes (STBCs). With multiple transmissions accompanied by the proposed combing strategy, the input-output relationship of the Alamouti STBC is formed in the receiver. It is observed that the proposed ARQ scheme attains higher throughput than others at all SNR values. View full abstract»

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  • 300 GHz vector-sum phase shifter using InP DHBT amplifiers

    Publication Year: 2013, Page(s):263 - 264
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    A vector-sum phase shifter that provides 90° phase control with a positive signal gain is successfully demonstrated at WR-3 band. The integrated circuit consists of input and output microstrip power dividers and two InP DHBT amplifiers with a 300 GHz gain of 14.8 dB. The measurements on a fabricated phase shifter show offset phases of -46°, -22°, 0°, 25°, 57�... View full abstract»

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  • 60 GHz CMOS downconversion mixer with 15.46 dB gain and 64.7 dB LO-RF isolation

    Publication Year: 2013, Page(s):264 - 266
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    A 60 GHz double-balanced mixer for direct downconversion using standard 90 nm CMOS technology is reported. The downconversion mixer comprises a double-balanced Gilbert cell with a current-reused RF single-to-differential converter for conversion gain (CG) enhancement, a Marchand balun for converting the single LO input signal to a differential signal, and a baseband amplifier. The mixer consumes 1... View full abstract»

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  • 100 GHz transformer-coupled quadrature oscillator

    Publication Year: 2013, Page(s):266 - 267
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (473 KB)

    A 96.4-100.8 GHz quadrature oscillator utilising transformer-coupled and magnetic tuning techniques has been implemented in 90 nm CMOS technology. Under 1 V supply operation, experimental results show that the phase and amplitude error between I and Q paths are smaller than 1.6- and 0.9 dB with power dissipation from 8.7 to 21 mW. The measured phase noise is -110.4 dBc/Hz at 10 MHz-offset away fro... View full abstract»

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  • CMOS 45 GHz vector modulator with gain/phase correction through calibration

    Publication Year: 2013, Page(s):267 - 269
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    A 45 GHz vector modulator designed in 45 nm SOI CMOS is presented along with an open-loop calibration technique for gain/phase correction. The continuous 360° vector modulator consists of a passive quadrature signal generation network followed by a Gilbert cell modulator. The simple, open-loop calibration procedure results in RMS gain and phase errors less than 0.5 dB and 5°, respect... View full abstract»

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  • Broadband substrate integrated waveguide edge-guided mode isolator

    Publication Year: 2013, Page(s):269 - 271
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (310 KB)

    An edge-guided mode isolator based on substrate integrated waveguide (SIW) technology is presented. A matching transition section from a ferrite isolator in a SIW to a microstrip is introduced and developed. Supporting experiments have been conducted to confirm the predicted performance of the new structure. View full abstract»

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  • Design of 825 GHz square helix travellingwave tube

    Publication Year: 2013, Page(s):271 - 272
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (213 KB)

    A helix travelling-wave tube for 825 GHz has been designed and its broadband amplification performance has been demonstrated with 3D particle-in-simulations. The design utilises a helix slow-wave structure with a square form and input/output couplers based on a transition from the helix to a coplanar waveguide and further to a rectangular waveguide with a through-substrate post coupler. A simulate... 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