Electronics Letters

Issue 13 • June 24 2010

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Displaying Results 1 - 25 of 56
  • In brief

    Publication Year: 2010, Page(s): 874
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (93 KB)

    First Page of the Article
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  • Interview

    Publication Year: 2010, Page(s): 874
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (85 KB)

    "Reducing power consumption in network systems is a major issue from the viewpoint of preventing global warming and reducing operational expenditure" View full abstract»

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  • Bandwidth boost for 850nm VCSELs

    Publication Year: 2010, Page(s): 875
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    An 850 nm VCSEL with a record 23 GHz modulation bandwidth has been engineered by researchers in Sweden. A dramatic increase in the high-speed properties of vertical cavity surface-emitting lasers (VCSELs) can be achieved by a simple reduction in the photon lifetime of the cavity, according to researchers in Sweden. View full abstract»

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  • Balance of power

    Publication Year: 2010, Page(s): 876
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    Researchers at TriQuint Semiconductor in the US have developed a GaN high electron mobility transistor (HEMT) on Si substrate that can deliver an X-band power performance comparable to that of a standard GaN on SiC device. It has the highest power added efficiency (PAE) ever achieved for these devices: 65 at 10 GHz, and this result makes GaN on Si technology an attractive, cost-effective solution ... View full abstract»

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  • Sleeve monopole antenna for DVB-H applications

    Publication Year: 2010, Page(s):879 - 880
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (451 KB)

    A sleeve monopole antenna is proposed, which can generate a wide operating band to cover the DVB-H band in the UHF frequency band. The proposed antenna is composed of a circular patch and a disc-conical sleeve, both of which are shorted to the ground plane through four shorting probes. With an antenna thickness of about 0.1 times the free-space wavelength of the centre operating frequency, the pro... View full abstract»

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  • Compact planar MIMO antenna array with polarisation diversity on single layer

    Publication Year: 2010, Page(s):880 - 882
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (676 KB)

    A novel compact and planar MIMO antenna array with polarisation diversity is proposed on a single layer. The proposed array is composed of two orthogonal polarised elements which act as electric and magnetic loop antennas. A high isolation of 20 dB between the two antennas is achieved at 2.3 GHz. The overall size of the array is 38 × 28 mm (i.e. 0.291 × 0.214 λ0). T... View full abstract»

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  • Low impedance bulk LTSA

    Publication Year: 2010, Page(s):882 - 883
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (178 KB)

    A low impedance bulk linearly tapered slot antenna (bulk LTSA) is proposed. It possesses low impedance because of its thicker than conventional metallic fins. Good matching is obtained with a transmission line or circuit over a wide millimetre-wave frequency range by choosing the fm thickness of a bulk LTSA appropriately. An experiment demonstrates that the bulk LTSA has high boresight directivity... View full abstract»

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  • Miniaturisation of printed inverted-F antenna using chip coupler for Bluetooth applications

    Publication Year: 2010, Page(s):883 - 885
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    A design for a printed inverted-F antenna (IFA) miniaturised by loading a ceramic chip coupler and to be used in Bluetooth applications is presented. The chip coupler is composed of printed meander lines on the surfaces of the ceramic (εr = 21) chip. The proposed printed IFA with the chip coupler reduces the size of the general type printed IFA by up to 68.3%. The antenna has a v... View full abstract»

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  • Multiband printed quadrifilar helical antenna

    Publication Year: 2010, Page(s):885 - 886
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (225 KB)

    A simple method for designing and optimising a multiband printed quadrifilar helix antenna is presented. Using multiple arm techniques, a tri-band antenna working in L-band for GPS applications is realised with a good gain and a good circular polarisation. Measured results are presented to validate the concept. View full abstract»

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  • Pattern reconfigurable antenna based on moving V-shaped parasitic elements actuated by dielectric elastomer

    Publication Year: 2010, Page(s):886 - 888
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (467 KB)

    A pattern reconfigurable antenna is reported comprising a monopole with a pair of V-shaped parasitic elements (VPE), the motion of which is controlled by a planar dielectric elastomer actuator (DEA). A computer model based on the finite-element method is used to simulate the electromechanical performance of the actuator. A prototype is used to validate the performed simulations and identify the re... View full abstract»

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  • Reconfigurable dual-band C-shaped monopole antenna array with high isolation

    Publication Year: 2010, Page(s):888 - 889
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (183 KB)

    A reconfigurable dual-band monopole array with high isolation for WLAN MIMO application is proposed. This antenna array contains two C-shaped monopoles with a shorting line, on which two RF switches were integrated, connecting the two antenna elements that are separated by a distance of 0.09Λ2.4GHz. High isolation at 2.4 or 5.2 GHz bands can be achieved by changing the states of ... View full abstract»

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  • Despeckling of medical ultrasound images based on quantum-inspired adaptive threshold

    Publication Year: 2010, Page(s):889 - 891
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (149 KB)

    A speckle suppression method for medical ultrasound images is proposed by combining the dual-tree complex wavelet transform (DTCWT) with a new quantum-inspired adaptive threshold function. An adaptive non-Gaussian statistical model is proposed for the complex wavelet coefficients. According to products of the coefficients and their parents in multi-scale subbands, the quantum-inspired probability ... View full abstract»

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  • Signal detection technique utilising 'lock-in' architecture using 2 ωc harmonic frequency for portable sensors

    Publication Year: 2010, Page(s):891 - 892
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    A signal detection technique utilising a `lock-in` architecture using the second-order harmonic frequency (2 ωc) applicable to portable optical-biosensor systems is presented. The properties of frequency synthesis and filtering techniques are used to detect a weak signal concealed in intense background noise, such as thermal noise, 1/f noise and shot noise. Using the 2 &#x... View full abstract»

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  • Compact low swing gearbox-type integrated capacitive DC/DC converter

    Publication Year: 2010, Page(s):892 - 894
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (189 KB)

    A gearbox-type capacitive DC/DC converter is presented with an enhanced switch- and capacitor-array. The switch overhead is reduced significantly with respect to a conventional implementation. The presented topologies exhibit a lower swing on the intermediate capacitor nodes so that power loss due to the parasitic capacitances on these nodes is reduced drastically. View full abstract»

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  • High bandwidth current mode amplifier for envelope modulated RF amplifiers

    Publication Year: 2010, Page(s):894 - 895
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (210 KB)

    A high bandwidth discrete current mode amplifier capable of driving large voltages into low impedances is presented. A differential current mirror output stage ensures stability at high frequencies. Small signal bandwidth is 24 MHz and large signal bandwidth extends into the megahertz region. When amplifying the AC component of a 3 MHz 3rd generation partnership project (3GPP) long term evolution ... View full abstract»

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  • Dual-mode dual-band bandpass filter using defected ground waveguide

    Publication Year: 2010, Page(s):895 - 897
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (636 KB)

    A novel dual-mode dual-band bandpass filter (BPF) design using a defected ground waveguide (DGW) with independently controlled centre frequencies is presented. This BPF consists of simple microstrip feedlines and embedded DGW resonators for single substrate configuration. Defected corner cut perturbation is applied to improve out-of-band performance and operating band selectivity. This filter has ... View full abstract»

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  • Low-order adaptive half-sample interpolators

    Publication Year: 2010, Page(s):897 - 898
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (153 KB)

    Although the fractional delay filtering literature is full of design methods and implementation techniques for fractional sample interpolators, a fundamental need for the proposition of low-order efficient designs still strongly exists. Proposed is such a system for half-sample interpolation. In contrast to the typical systems studied in the literature for fractional delay filtering, the system pr... View full abstract»

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  • Rail-to-rail input-stage with linearly tunable transconductance

    Publication Year: 2010, Page(s):898 - 900
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (86 KB)

    A new technique for the rail-to-rail input stage is proposed. The proposed technique is based on the master-slave approach of complementary MOS transistor pairs. The input transconductance is linearly tunable over a large range and is almost constant for the rail-to-rail common-mode range. The effectiveness of the proposed technique was verified by simulations using a standard 0.18 m CMOS process. View full abstract»

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  • Scalar PWM algorithms for four-switch three-phase inverters

    Publication Year: 2010, Page(s):900 - 902
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (387 KB)

    Four-switch three-phase inverters (FSTPIs) have been proposed to be used in low-cost applications because of the reduced number of semiconductor devices, and space vector pulse width modulation (SVPWM) techniques have also been introduced to control FSTPIs. However, high-performance controllers are needed to implement complicated SVPWM algorithms, which limits their low-cost applications. To simpl... View full abstract»

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  • Switched-capacitor cyclic DAC with mismatch charge compensation

    Publication Year: 2010, Page(s):902 - 903
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    A switch-capacitor cyclic DAC with mismatch charge compensation scheme is proposed. With this approach, the DAC error caused by capacitor mismatches can be effectively reduced, which alleviates the matching requirement. The operation of the proposed DAC is verified through circuit level simulations. View full abstract»

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  • Triple-bit method for power estimation of nonlinear digital circuits in FPGAs

    Publication Year: 2010, Page(s):903 - 905
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (149 KB)

    Power consumption of many of the digital signal processing systems available is nonlinear. Signal distribution at the multiplier output changes significantly with respect to its input signal distributions. Data signals have a large impact on design power, so the multiplier output has to be modelled properly. A model to compute the bit-level switching activity of each multiplier output bit is prese... View full abstract»

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  • 3D face detection using transform invariant features

    Publication Year: 2010, Page(s):905 - 907
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (111 KB)

    A generic, transform invariant 3D facial feature detection method based on mean (H) and Gaussian (K) curvature analysis is proposed. A scale space of the HK values is constructed differently from the previous HK attempts. The 3D features are extracted from this scale space and used in a global topology, which is trained with a Gaussian model using only faces with neutral and frontal poses. The mod... View full abstract»

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  • Adaptive non-convex total variation regularisation for image restoration

    Publication Year: 2010, Page(s):907 - 908
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (223 KB)

    An adaptive non-convex total variation regularisation is proposed for blind image restoration. A flux corrected transport (FCT) technique is used to obtain a stable numerical scheme, where a spatially varying constraint allows a better restoration of image edges and fine detail. Finally, its advantages are shown in deblurring edges, denoising and restoring fine details of image simultaneously in e... View full abstract»

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  • RGB colour gradient following colour constancy preservation

    Publication Year: 2010, Page(s):908 - 910
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (305 KB)

    A colour gradient operator defined following colour constancy preservation properties is presented. The approach does not need a priori information or changes of colour space. It is based on the angular distance between pixel colour representations in the RGB space. It is naturally invariant to intensity magnitude, implying high robustness against bright spots produced by specular reflectio... View full abstract»

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  • High-quality real-time moving object detection by non-parametric segmentation

    Publication Year: 2010, Page(s):910 - 911
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (234 KB)

    Usually, moving object detection by exclusively background modelling is not enough to separate correctly background and foreground. On the other hand, strategies based on both background and foreground models are complex and computationally inefficient, and therefore need to be optimised for real-time performance. A novel and fast strategy for moving object detection by non-parametric background-f... 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