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Electronics Letters

Issue 3 • Date February 2 2012

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Displaying Results 1 - 25 of 37
  • In brief

    Publication Year: 2012 , Page(s): 134
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  • Interview

    Publication Year: 2012 , Page(s): 134
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  • Reading the waters

    Publication Year: 2012 , Page(s): 135 - 136
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  • Powering down

    Publication Year: 2012 , Page(s): 136
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  • Acoustic targets feature extraction method based on manifold learning

    Publication Year: 2012 , Page(s): 139 - 140
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    A new method for feature extraction of acoustic targets based on manifold learning is proposed. The new method overcomes the shortcomings of the original manifold learning algorithm by minimising the impact of noise on the manifold and makes full use of the classification information to extract the intrinsic features of acoustic targets, thus improving the accuracy of acoustic targets recognition. Results of experiments suggest the proposed method is efficient and feasible. View full abstract»

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  • Compact planar microstrip-fed quasi-Yagi antenna

    Publication Year: 2012 , Page(s): 140 - 141
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (398 KB)  

    A novel compact planar microstrip-fed quaisi-Yagi antenna is investigated. The feeding structure is directly realised by a microstrip line and has the advantage of avoiding the introduction of a balun, transition, tapered or truncated structures, thereby decreasing design complexity. The proposed antenna shows measured impedance bandwidth from 2.74 to 4.25 GHz for a return loss less than 10 dB, and exhibits 13 dB front-to-back (F/B) ratio, 15 dB cross-polarisation, 8.77 dB absolute peak gain, 60 half power beam width (HPBW) in the E-plane and 68 HPBW in the H-plane at the centre frequency (3.5 GHz). Measured results are in good agreement with electromagnetic simulations. View full abstract»

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  • Continuously polarisation reconfigurable antenna element by using liquid crystal based tunable coupled line

    Publication Year: 2012 , Page(s): 141 - 143
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (355 KB)  

    A polarisation reconfigurable microstrip patch antenna element is presented. The antenna includes a liquid crystal based tunable coupled line by which the antenna polarisation can be controlled. The prototype is fabricated in a similar fashion to LC displays resulting in a low-cost and simple fabrication compared to other tunable device fabrication technologies. The antenna operates at 13.75 GHz with a return loss of better than 10 dB and its polarisation is tuned continuously between linear and circular polarisations by applying a bias voltage from 0 to 40 V to the coupled line. View full abstract»

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  • 68.4 μW 400 MHz intrabody communication receiver front-end for biomedical applications

    Publication Year: 2012 , Page(s): 143 - 144
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    A 400 MHz sub-hundred microwatt intrabody communication receiver front-end suitable for OOK, ASK and FSK modulation schemes and applied to personal health wearable/implantable devices is presented. 68.4 μW of static power, 24.1 dB of gain, at least 18 dB fundamental above distortions and 167×118 μm2 of core size are achieved in 0.18 m CMOS technology. View full abstract»

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  • ISFET sensor system for real-time detection of extracellular pH oscillations in slime mould

    Publication Year: 2012 , Page(s): 144 - 146
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (541 KB)  

    An ion sensitive field effect transistor (ISFET) array for the direct observation of physiochemical activity in a living biological specimen of a slime mould is demonstrated. The chip comprises a 64 × 64 pixel array of 10.2 × 10.2 μm sensors. The device was fabricated in a standard 0.35 μm foundry CMOS process. Using this device it was possible to observe periodic variations in pH consistent with the biological activity of slime mould with oscillatory amplitudes of 450 μV × 70 μV peak-to-peak, equating to 0.022 pH units at 20 mV/pH sensitivity, when taking data at a rate of 400 μs per pixel-sample. These oscillations arise from intracellular Ca2+ variations giving rise to an extracellular pH change. View full abstract»

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  • Area-efficient programmable switched-capacitor-based peak detector

    Publication Year: 2012 , Page(s): 146 - 148
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (173 KB)  

    An area-efficient programmable switched-capacitor-based peak detector (PD) is presented. A programmable switched-capacitor resistor (SCR) is used to replace the small discharging current source in the conventional PD. The SCR can be programmable from megohms to gigaohms to ensure that the proposed PD works properly and achieves small detection errors over a wide input frequency range. The proposed PD has been fabricated in a 0.18 m CMOS process and occupies an area of only 0.014 mm2. Measurement results show that the proposed PD consumes 0.2 mA from a 1.8 V power supply and the detection errors are within 2% when the input frequency varies from 2 kHz to 4 MHz and the input peak varies from 0.45 to 1.75 V. View full abstract»

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  • FPGA implementation of biologically-inspired auto-associative memory

    Publication Year: 2012 , Page(s): 148 - 149
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (413 KB)  

    The design of an auto-associative memory based on a spiking neural network is described. Delays rather than binary values are used to represent signals and coincidence is used to perform pattern matching. A complete implementation of the memory on a single FPGA is presented. View full abstract»

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  • Matched dual-channel front-end preamplifier for differential time delay measurements

    Publication Year: 2012 , Page(s): 149 - 150
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (345 KB)  

    Presented is an integrated circuit dual-channel front-end preamplifier that minimises the differential time delay (DTD) between two channels. The circuit, which is based on a chopper architecture, works in the audio range and is intended for applications in sound localisation based on bearing estimation. The circuit was fabricated in a 1.5 × 1.5 mm die, in a 0.5 μm technology. Experimental results indicate a mean DTD of 0.125 μs, which is one order of magnitude smaller than the experimental results reported in the literature so far. View full abstract»

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  • Wideband measurement system for on-chip ESD waveform characterisation

    Publication Year: 2012 , Page(s): 150 - 152
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    In this age where new electronic designs are constantly pushing the limits of technology, there is a persistent need for better electrostatic discharge (ESD) protection. Proposed is a measurement probe architecture that can be used for on-chip ESD waveform characterisation. The probe circuit design is presented and test results show the feasibility of the proposed system. Such a measurement system provides invaluable information, aiding the electronics designer in the search for more robust chip designs. View full abstract»

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  • Fast online identification of low-order time-delayed industrial processes

    Publication Year: 2012 , Page(s): 152 - 153
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (243 KB)  

    Although online identification of low-order industrial processes is straightforward when the time delay is known and fixed, the problem becomes significantly more challenging when the delay is unknown and/or varying. Presented is a fast, exact recursive identification algorithm for this situation with a memory and time complexity that is linearly bound in the unknown delay. Experiments indicate the method significantly improves upon the memory and computation requirements typical of previous online methods, and possesses improved convergence properties. View full abstract»

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  • Alpha matting using compressive sensing

    Publication Year: 2012 , Page(s): 153 - 155
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (470 KB)  

    Image matting may be defined as the extraction and composition of foreground pixels from a given image using colour or opacity estimation. A novel alpha matting methodology is proposed using compressive sensing. The experimental results show that the proposed matting method can provide good mattes from either scribbles or large parts of unknown regions in a trimap. View full abstract»

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  • Image enhancement using background brightness preserving histogram equalisation

    Publication Year: 2012 , Page(s): 155 - 157
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    Histogram equalisation (HE) is widely used to enhance the image contrast but it tends to over-enhance the image background brightness. Improvement schemes have been introduced to reduce this defect of the conventional HE, but the over-enhancement of the background brightness is still obvious. A novel approach of nonlinear HE is presented, which is able to enhance the image contrast while preserving the background brightness for images with well-defined background brightness. View full abstract»

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  • Subspace estimates for real-time hyperspectral video systems

    Publication Year: 2012 , Page(s): 157 - 159
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (128 KB)  

    A method is presented for rapidly estimating the principal components used in dimension reduction for high frame rate hyperspectral video systems. Pixels entering and leaving a video frame are used to rapidly update the covariance matrix (Σ) and estimate the perturbed eigenpairs. Measuring the angle between the estimated dominant eigenspace and the exact eigenspace shows the method to be a good approximation when the difference between frames is low (||δΣ|| ≪ ||Σ||). This method reduces the time to calculate the principal components of high resolution hyperspectral video data by a factor of ~20. View full abstract»

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  • Simple implementation of vectorial modulo operation based on fundamental parallelepiped

    Publication Year: 2012 , Page(s): 159 - 160
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    Multidimensional lattices constitute a unifying framework for several signal processing applications. Described is a simple and elegant algorithmic implementation of the vectorial modulo operation based on the lattice fundamental parallelepiped which permits automatising the lattice elements' indexing. View full abstract»

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  • Efficient multivariate feature filter using conditional mutual information

    Publication Year: 2012 , Page(s): 161 - 162
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (207 KB)  

    This reported work focuses on designing an efficient feature filter from a computational point of view. The proposed multivariate filter method using conditional mutual information selects a feature subset that maximises relevance to target class while minimising redundancy between features in O(N) time. View full abstract»

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  • Fast sparse representation model for I1-norm minimisation problem

    Publication Year: 2012 , Page(s): 162 - 164
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (193 KB)  

    To solve the l1-norm minimisation problem, many algorithms, such as the l1-Magic solver, utilise the conjugate gradient (CG) method to speed up implementation. Since the dictionary employed by CG is often dense in `large-scale` mode, the time complexities of these algorithms remain significantly high. As signals can be modelled by a small set of atoms in a dictionary, proposed is a fast sparse representation model (FSRM) that exploits the property and it is shown that the l1-norm minimisation problem can be reduced from a large and dense linear system to a small and sparse one. Experimental results with image recognition demonstrate that the FSRM is able to achieve double-digit gain in speed with comparable accuracy compared with the l1-Magic solver. View full abstract»

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  • Inductor structure with improved space utilisation

    Publication Year: 2012 , Page(s): 164 - 165
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (246 KB)  

    The core and winding of an inductor are designed to distribute flux for distributing energy uniformly in the core to utilise magnetic material throughout the core volume. The structure is designed to avoid crowding of flux for low core loss. The winding is patterned for shorter length and larger area of the cross-section for low winding loss. The footprint area of a three-cell inductor is 1.48 times less than that of the conventional toroidal inductor with same energy, maximum flux density, material properties, winding loss, and core loss. View full abstract»

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  • 1.4 MHz radio frequency metal-base transistor using single emitter layer

    Publication Year: 2012 , Page(s): 165 - 166
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (249 KB)  

    A report is presented on a study of single emitter layer metal base transistors with a base terminal made of aluminium grids. The latter exhibits low operating voltage associated to the high resistivity of the collector terminal and also shows very low leakage current. With such a single emitter layer, common-emitter current gain, on/off current ratio, and cutoff frequency of, respectively, 239.62, 3.8×107, and 1.4 MHz, were obtained. View full abstract»

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  • Design of compact inphase power divider with one narrow notch band for UWB application

    Publication Year: 2012 , Page(s): 166 - 168
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (374 KB)  

    A novel multilayer inphase power divider with ultra-wideband behaviour and a sharply rejected notch band is presented. The proposed power divider employed a broadside coupling structure via a multilayer slot configuration and a single isolation resistor. One notch band is obtained by introducing one coupled folded stepped impedance resonator with metalised via hole to ground. Simulated and measured results show that the proposed power divider has equal power division with high stability of phase, low insertion loss and good return loss at the three ports across the band 2.7 to more than 11.0 GHz. View full abstract»

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  • Using body biasing to control phase-noise of CMOS LC oscillators

    Publication Year: 2012 , Page(s): 168 - 169
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (235 KB)  

    An approach to adjusting and optimising the phase-noise performance of CMOS LC oscillators is presented. The technique is based on controlling the bulk-source voltage of the cross-coupled transistors in the oscillator core. It is shown that the impedance in the path of the current through the oscillator core to ground at the second harmonic of oscillation can be maximised through changing the value of the parasitic capacitances. The technique is validated by measured results from a proof-of-concept LC oscillator fabricated in a 90 nm CMOS process. View full abstract»

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  • 1 x 8 self-routing of 40 Gbit/s phase-modulated packets

    Publication Year: 2012 , Page(s): 169 - 171
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (347 KB)  

    A self-routing all-optical circuit for 40 Gbit/s DPSK optical packets is presented. The header information is self-processed to eventually drive an all-optical flip-flop, which serves as the optical pump in a coherent wavelength converter. Operation of the circuit is shown and switched optical packets with an overall limited penalty ( 1 dB) are reported. 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