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Electronics Letters

Issue 18 • Date August 30 2012

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Displaying Results 1 - 25 of 53
  • In brief

    Publication Year: 2012, Page(s): 1084
    IEEE is not the copyright holder of this material | PDF file iconPDF (78 KB)
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  • Interview

    Publication Year: 2012, Page(s): 1084
    IEEE is not the copyright holder of this material | PDF file iconPDF (76 KB)
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  • Mixed pulses

    Publication Year: 2012, Page(s): 1085
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (437 KB)

    Researchers from Eidgenössische Technische Hochschule Zürich (ETH Zürich) in Switzerland have achieved a record high average power for modelocked integrated external-cavity surface emitting laser (MIXSEL) oscillators. After absorber optimisation, structure design and thermal improvements, their laser, presented in this issue of Electronics Letters, produced 2.4 W at ... View full abstract»

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  • Down to the wire

    Publication Year: 2012
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (286 KB)

    A monolithic silicon photodetector that could be used at low cost on a variety of silicon photonics platforms has been presented by researchers from McMaster University working with Wilfrid Laurier University in Canada. The detector is compatible with wire waveguides which could benefit many silicon photonics applications. View full abstract»

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  • Faster convergence for MoM analysis of resonant circular arrays of cylindrical dipoles

    Publication Year: 2012, Page(s):1089 - 1090
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (123 KB)

    Method-of-moments analyses of resonant circular arrays of cylindrical dipoles present unique and particular difficulties. A previous publication overcame the major difficulties by using a set of improved kernels in the usual Hallén-type integral equations and by applying an appropriate convergence acceleration method. Based on previous works dealing with the isolated cylindrical dipole, pr... View full abstract»

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  • Feasible load modulation technique using multiple antenna systems

    Publication Year: 2012, Page(s):1090 - 1091
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    In the passive multiple-input multiple-output transmission scheme, load modulation is applied to the multi-antenna, and a number of signals can be transmitted in parallel. The tag is defined as the multi-antenna that has load impedance, and it can control the reflective wave by switching its load impedance independently. The termination impedance pattern of the tag antennas is determined such that... View full abstract»

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  • Realisation of X-band circularly-polarised waveguide-fed microstrip array

    Publication Year: 2012, Page(s):1092 - 1093
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (311 KB)

    A novel design of a circularly-polarised microstrip patch array fed by a waveguide is developed. A special central microstrip patch-to-slotted waveguide topology helps a simple truncated patch array realising the circular polarisation. The simulated and measured return losses, gains, axial ratios, and radiation patterns are presented for this new 4×4 array at X-band with good results. View full abstract»

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  • Control of neural signal propagation in neuron by three terminal electrodes method

    Publication Year: 2012, Page(s):1093 - 1095
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (327 KB)

    Neural signal propagation is completely different from electron transport in conventional electronic devices. The electrical control of propagation of a neural signal in a single neuron is interesting from the standpoint of neural device applications in future, which could be the basis of future pain control or activation of a neuron in a part of the body. In this reported work the control of neur... View full abstract»

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  • Effect of realistic human head modelling on brain source distribution

    Publication Year: 2012, Page(s):1095 - 1097
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (241 KB)

    The accuracy of the source localisation using EEG measurements depends on the noise as well as the computational model, so the improvement of localisation performance by using a very realistic model is limited. In this reported work, the source localisation effects of various human head models with different geometrical deformation for low signal-to-noise ratio (SNR) measurement are investigated. ... View full abstract»

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  • Multi-target stimulator SSVEP using multi-frequency embedded with multi-phase encoding sequence

    Publication Year: 2012, Page(s):1097 - 1098
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (337 KB)

    Presented is a novel coding method for steady-state visual evoked potential (SSVEP). To relax the limitations of SSVEP, the number of flash stimulators requires the same number of flashing frequencies for coding. However, the number of frequencies that may be required for stimulation is limited. This study proposes multi-frequencies embedded with the multi-phase flickering sequences stimulation me... View full abstract»

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  • Wide-range, high-accuracy signal-processing unit for implantable potentiostats

    Publication Year: 2012, Page(s):1098 - 1100
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (349 KB)

    A new signal-processing unit (SPU) for implantable biomedical sensors is proposed. The proposed scheme combines the advantages of the two main structures of conventional SPUs (delta-sigma modulator and charging capacitor in feedback). The preliminary design has been realised in a 0.35 m CMOS process. Test results validate the desired functionality of the system. In this reported work an additional... View full abstract»

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  • Dual cross-coupling LNA with forward body bias technique

    Publication Year: 2012, Page(s):1100 - 1102
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (301 KB)

    A fully integrated low-power LNA with dual cross-coupling and forward body bias (FBB) techniques is presented. The first cross-coupling circuit is applied at the transconductance stage. By connecting body nodes to each other's source terminals, the body cross-coupling network forms the gate-driven and body-driven simultaneously input stage to gain its effective transconductance, which in turn impr... View full abstract»

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  • Low-power fast-update pipelined phase accumulator for CML-based high-speed CMOS DDFSs

    Publication Year: 2012, Page(s):1102 - 1104
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    Presented is a phase accumulator (PACC) for current-mode logic (CML)-based high-speed CMOS direct digital frequency synthesisers (DDFSs). The proposed PACC not only consumes low power by using an adaptive power reduction technique, but also updates frequency information within one clock period by using dual function logic gates and the charge sharing scheme that accelerates current recovery time. ... View full abstract»

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  • Clock-biased local bit line for high performance register files

    Publication Year: 2012, Page(s):1104 - 1105
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (604 KB)

    A clock-biased local bit line (CB-LBL) scheme is presented to achieve high access speed and energy efficient operation for register files. Simulation results in 32nm high-k/metal gate CMOS predictive technology show 49.5% read latency reduction and 39.4% power savings, with less than 5% impact on noise immunity and within 1% increase in area overhead. Additionally, CB-LBL can achieve 99.8% paramet... View full abstract»

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  • High precision analogue memristor state tuning

    Publication Year: 2012, Page(s):1105 - 1107
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (207 KB)

    A report is presented on the operation of an analogue programming circuit for accurately setting the state of a memristor. The circuit exploits the dynamic modulation of resistance under a constant DC bias while real-time measurements of the memristance are performed using an AC signal. The circuit employs feedback for converging the state of a device at any required level within a decade. This al... View full abstract»

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  • Implementation of very high radix division in FPGAs

    Publication Year: 2012, Page(s):1107 - 1109
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

    A new approach in multiplication-based dividers for FPGAs is proposed. It relies on very high radix algorithms with prescaling of divisor and dividend. The required multiplications (prescale factor computations, divisor prescaling, dividend prescaling, and the division main iteration) are performed using a simplified version of a multiply-add fused unit, which integrates well into the FPGA specifi... View full abstract»

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  • Increasing frequency of ring oscillators by using negative capacitors

    Publication Year: 2012, Page(s):1109 - 1110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (170 KB)

    A new method is proposed for increasing the oscillation frequency of resistive load ring oscillators. Frequency increment is achieved by decreasing of the output equivalent capacitor. That is, a negative capacitor circuit is used to decrease the output equivalent capacitor. Oscillation frequency will be increased, even if capacitors in output nodes are only due to internal capacitors of transistor... View full abstract»

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  • Mapping between different kinematic structures without absolute positioning during operation

    Publication Year: 2012, Page(s):1110 - 1112
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (123 KB)

    When creating datasets for modelling of human skills based on training examples from human motion, one can encounter the problem that the kinematics of the robot does not match the human kinematics. Presented is a simple method of bypassing the explicit modelling of the human kinematics based on a variant of the self-organising map (SOM) algorithm. While the literature contains instances of SOM-ty... View full abstract»

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  • Robust current control for speed sensorless DC motor drive using reduced-order extended observer

    Publication Year: 2012, Page(s):1112 - 1114
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (322 KB)

    A practical disturbance estimation algorithm for DC motor current control is presented to enhance robustness against parameter uncertainty and remove the need for a speed (or position) sensor. Analysis using the singular perturbation theory has been performed to verify that the additional feedforward compensation with the proposed algorithm can improve the robust transient performance under both p... View full abstract»

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  • Acquisition front-end immune to EMI

    Publication Year: 2012, Page(s):1114 - 1115
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    A new method to achieve immunity to EMI in a front-end for baseband analogue signal acquisition, avoiding the adverse effects of electromagnetic interference on operational amplifier-based conditioning amplifiers, is proposed. Unlike previous solutions, the presented novel system-level approach is based on standard hardware and does not require microelectronic optimisation. The validity of the pro... View full abstract»

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  • Fast calculation of reverberation chamber Q-factor

    Publication Year: 2012, Page(s):1116 - 1117
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (169 KB)

    An approximate but fast method to calculate the reverberation chamber Q-factor based on the volume mean value of the electric field is presented. Meanwhile, combined with the finite difference time domain (FDTD) method, the Q-factor is calculated with a small amount of calculation and less time. This method is verified comparing with measured data. View full abstract»

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  • Efficient intra prediction algorithm for smooth regions in depth coding

    Publication Year: 2012, Page(s):1117 - 1119
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (199 KB)

    An intra prediction algorithm is proposed aiming to efficiently encode smooth regions in depth maps. By taking the textureless characteristics of depth maps into account, only one single prediction direction instead of multiple prediction directions is sufficient in intra prediction of depth maps. Consequently, coding of the prediction direction can be skipped which results in lower computational ... View full abstract»

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  • Hierarchical human activity recognition system based on R-transform and nonlinear kernel discriminant features

    Publication Year: 2012, Page(s):1119 - 1120
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (113 KB)

    A framework for a video based hierarchical human activity recognition (HAR) system is presented based on efficient feature extraction and dimension reduction techniques R-transform and kernel discriminant analysis (KDA). The hierarchical HAR system is proposed to group similar activities and further improve the recognition rate. A first level system uses R-transform to extract symmetric, scale and... View full abstract»

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  • Nearest feature centre classifier for face recognition

    Publication Year: 2012, Page(s):1120 - 1122
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (325 KB)

    A novel classifier based on feature line, called the nearest feature centre (NFC) classifier, is proposed for face recognition. NFC uses the new metric, called the feature centre metric, which is different from the classical feature line metric of the nearest feature line (NFL). The experimental results on the ORL face database show that NFC outperforms NFL and the other classifiers based on featu... View full abstract»

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  • Passive ranging using image intensity and contrast measurements

    Publication Year: 2012, Page(s):1122 - 1123
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (293 KB)

    Proposed are two passive ranging approaches using a single camera, based on intensity and contrast measurements. According to the Beer-Lambert law and known atmosphere extinction coefficient and initial range, the range to a moving object is estimated. Using these approaches in a real infrared surveillance sequence, better results are obtained than with methods which use image size measurements. T... 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