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Electronics Letters

Issue 12 • Date June 9 2011

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Displaying Results 1 - 25 of 33
  • In Brief

    Publication Year: 2011 , Page(s): 680
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  • Interview

    Publication Year: 2011 , Page(s): 680
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  • Round the bend

    Publication Year: 2011 , Page(s): 681
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (343 KB)  

    This paper present the first bendable transimpedance amplifier shows promise for system-on-panel e-textile applications. View full abstract»

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  • One good turn

    Publication Year: 2011 , Page(s): 682
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (303 KB)  

    A single element antenna has been integrated with a commercially available switch system to achieve beam steering for portable and compact applications. A team of collaborating researchers from the UK and Japan created the low profile reconfigurable antenna system using a hybrid high-impedance surface (HHIS)-based square loop antenna and a PIN diode-based SP4T switch, and demonstrated it as a complete unit with its associated electronics. View full abstract»

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  • CPW-fed slot antenna with triangular SRR terminated feedline for WLAN/WiMAX applications

    Publication Year: 2011 , Page(s): 685 - 686
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (207 KB)  

    A novel CPW-fed slot antenna for Wireless Local Area Networks (WLAN) and World Interoperability for Microwave Access (WiMAX) applications is proposed, which can produce dual bands. Employing a CPW feedline terminated with a triangular split-ring res onator (SRR), good wide impedance matching can be achieved without an external matching circuit, and then wide bandwidths in the two working bands could be implemented conveniently. Measured results show that the proposed antenna can yield an impedance bandwidth of 1.96-4.33 and 5.05-7.23 GHz with reflection coefficient (SI 1) less than - 10 dB. In addition, the antenna has good radiation patterns in both E and H-planes. A comparison between measured and simulated results is demonstrated. View full abstract»

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  • Implementation and simulation of commercial RF switch integration with steerable square loop antenna

    Publication Year: 2011 , Page(s): 686 - 687
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (305 KB)  

    For the first time, integration of a commercial single-pole four-throw RF switch with beam steerable square loop antenna is presented. By controlling the switch bias the high gain tilted beam of the antenna can be steered electronically in all the four space quadrants. A model of the complete integrated switch with the antenna has been developed and simulated. Further, for achieving distortion-free patterns and error free simulation comments are made on the placement of the RF switch and associated meshing considerations. For the test band (4.3 - 5.0 GHz) the antenna generates a steerable tilted beam with a directivity of 8.0 dBi ± 0.4 dB. View full abstract»

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  • Integrated Bluetooth and multi-band ultra-wideband antenna

    Publication Year: 2011 , Page(s): 688 - 689
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (477 KB)  

    A novel planar antenna integrated Bluetooth and multi-band ultra-wideband antenna is presented. This antenna is electromagnetically coupled to the feed microstrip-line on one side of the dielectric substrate, and through a via-hole, to a radiating element in the ground plane. By inserting a triangular slot inserted in the ground plane, a much wider impedance bandwidth from 2.7-15-GHz is realised. By inserting a complementary split-ring resonator (SRR) slot in the radiating element, two notched bands at WLAN (4.76-6-GHz) and some C-band satellite communication systems (6.6-7.5-GHz) are realised, and owing to the coupling between the two SRRs, the Bluetooth band will be generated. View full abstract»

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  • Instruction identification algorithm of instruction-set extensions based on relationship matrix

    Publication Year: 2011 , Page(s): 689 - 690
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (137 KB)  

    A novel instruction identification algorithm of instruction-set extensions based on a relationship matrix is proposed. Through using a relationship matrix the infeasible regions in the complete search space are pruned and the search speed for subgraphs of the application data flow graph is accelerated greatly. Compared with Atasu's algorithm, the experiments prove that the search number of valid nodes is the same but the search number of invalid nodes is decreased by about 40-82%. View full abstract»

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  • Indium-gallium-zinc-oxide based mechanically flexible transimpedance amplifier

    Publication Year: 2011 , Page(s): 691 - 692
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (212 KB)  

    A mechanically flexible amorphous indium-gallium-zinc-oxide (a-IGZO) based transimpedance amplifier is demonstrated. The circuit consists of an a-IGZO thin-film transistor (TFT) and two resistors made of a-IGZO TFTs, integrated on a 50 m-thick Kapton substrate. A transimpedance (current-to-voltage) gain of 86.5 dB and a cutoff frequency of 8.38 kHz are measured at a supply voltage of 5 V. The mechanical flexibility of the transimpedance amplifier is tested by bending the circuit to radii of 10 and 5 mm generating tensile strains of 0.3 and 0.5 , respectively. Bending the circuit to a radius of 5 mm decreases the gain by 1 dB and increases the cutoff frequency by 1.45 kHz. The decreased gain is due to the increased electron mobility in the a-IGZO devices caused by the strain. View full abstract»

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  • Radial basis function network for exponential stabilisation of periodic orbits for planar bipedal walking

    Publication Year: 2011 , Page(s): 692 - 694
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (80 KB)  

    Presented is a novel and analytical approach to design a hybrid controller based on hybrid zero dynamics for exponential stabilisation of a desired periodic orbit for a hybrid model of walking composed of single and double support phases. To achieve this goal, the effect of a double support phase on angular momentum transfer and stabilisation is investigated. Also, the class of control inputs corresponding to an orbit during double support is presented. A smooth feedback law based on a radial basis function network is then proposed for the double support phase such that (i) the desired orbit is exponentially stable and (ii) the control vector minimises the least square control cost. View full abstract»

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  • Content-aware broadcast soccer video retargeting using fuzzy logic

    Publication Year: 2011 , Page(s): 694 - 695
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    A content-aware video retargeting method is proposed for playing broadcast soccer video in small displays. Four visual perception clues are predefined based on soccer game-specific knowledge and modelled by visual attention features firstly. Then, a fuzzy logic inference system is proposed to estimate visual attention values (AVs) of ball and players by fusing attention features. AVs are later used to determine the region of interest (ROI) of each frame. Finally, a retargeted video is generated by the ROI of each frame with polynomial curve fitting for temporal smoothing. Both subjective and objective evaluation results are promising. View full abstract»

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  • High dynamic range hybrid pixel sensor

    Publication Year: 2011 , Page(s): 695 - 696
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (199 KB)  

    A new readout imaging system with enhanced dynamic range (DR) and low power consumption is presented. The DR is enhanced by using feedback to control the integration time of the sensor. The feedback is implemented within an in-pixel-level ADC. The power consumption is reduced by switching the bias circuit off when it is not needed for the system, this readout circuit is used for a hybrid sensor: the photodiode and the readout circuits are placed in two different layers, the interconnections are made through bond pads. View full abstract»

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  • Real-time body gesture recognition using depth camera

    Publication Year: 2011 , Page(s): 697 - 698
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (113 KB)  

    Human body gesture recognition is a common problem in human-robot interaction. Presented is a novel method for body gesture recognition using a RGB-Depth camera. The proposed technique is able to recognise body gestures, which allow communication between human and robot in order to perform a set of actions by a robot. Also presented is a simple, but fast and effective method for body gesture recognition, which includes illumination invariant skin-colour segmentation. View full abstract»

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  • High-performance laser-pumped rubidium frequency standard for satellite navigation

    Publication Year: 2011 , Page(s): 698 - 699
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (203 KB)  

    Presented is a double-resonance continuous-wave laser-pumped rubidium (Rb) atomic clock with a short-term stability of 4 × 10-13 τ-1/2 for integration times 1 s ≤ τ ≤ 1000 s, and a medium- to long-term stability reaching the 1 × 10-14 level at 104 s. The clock uses an Rb vapour cell with increased diameter of 25 mm, accommodated inside a newly developed compact magnetron-type microwave cavity. This results in a bigger signal with reduced linewidth, and thus improved short-term stability from a clock with 1 dm3 physics package volume only. The medium- to long-term clock stability is achieved by minimising the effects of light-shift and temperature coefficient on the atoms. Potential applications of the clock are discussed. View full abstract»

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  • Fast and adaptive evolutionary algorithm for minimum-cost multicast with network coding

    Publication Year: 2011 , Page(s): 700 - 701
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (69 KB)  

    Presented is a fast and adaptive evolutionary algorithm that minimises the resource consumption of network coding while achieving the target multicast rate. To this end, infeasible individuals adaptively participate as well in searching for better solutions, and all individuals are evaluated in an opportunistic manner. The empirical results have adduced grounds for the effectiveness of the approach. View full abstract»

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  • 60 GHz reflection-type phase shifter using 0.13μm CMOS body-floating switches

    Publication Year: 2011 , Page(s): 701 - 703
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (215 KB)  

    A two-bit reflection-type phase shifter (RTPS) is fabricated using 0.13 μm CMOS process for 60 GHz operation. The reflective loads in the RTPS are designed to achieve minimal loss with use of shunt switches and body-floating resistors. The measurement shows an average insertion loss of 6.4 dB for four phase states with the worst case loss of 7.7 dB at 60 GHz. View full abstract»

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  • Ultra-low power series input resonance differential common gate LNA

    Publication Year: 2011 , Page(s): 703 - 704
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (260 KB)  

    In the 2.4 GHz IEEE 802.15.4 standard, the noise figure (NF) requirement can be relaxed to minimise power consumption. A fully differential gm-boosting common-gate (CG) low-noise amplifier (LNA) with a series inductor input matching network is proposed. The LNA consumes less than 1 mA from 1 V power supply and achieves a measured gain of 15.5 dB. The series inductor input matching CGLNA is attractive for low-power fully integrated applications in CMOS technologies. View full abstract»

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  • Design of LTCC wideband bandpass filter using semilumped resonators

    Publication Year: 2011 , Page(s): 704 - 705
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (251 KB)  

    A novel broadband bandpass filter with semilumped resonators based on low-temperature co-fired ceramic (LTCC) technology is proposed. By properly controlling the elements of each resonator, two transmission zeros can be located at both sides of the passband for better selectivity. Moreover, multilayer capacitors are adopted to increase the capacitance without area increment. Measured results show a bandwidth of more than 65%, where the centre frequency is 3.6%GHz. View full abstract»

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  • Dual-band differential quadrature divider with asymmetric structure

    Publication Year: 2011 , Page(s): 706 - 707
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (241 KB)  

    Presented is a new dual-band differential quadrature divider with asymmetric structure operating at GPS L1 and L2 bands (1575 and 1227 MHz) for circularly polarised (CP) antennas and RF transceivers. The proposed structure is composed of one ring hybrid coupler and two Wilkinson dividers with three λ/4 short stubs. Each circuit is designed asymmetrically for dual-band characteristics. View full abstract»

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  • Reconfigurable coupler with two operating modes for transceivers and diversity systems

    Publication Year: 2011 , Page(s): 707 - 708
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (206 KB)  

    A novel reconfigurable coupler with two operating modes is presented. The proposed structure can be electronically configured to operate as either a forward coupler or backward coupler, which is very useful in transceivers and diversity systems. Flat coupling in backward mode and high isolation in forward mode can be obtained, respectively, while the bandwidth is enhanced at the same time. For demonstration purposes, a 3 dB reconfigurable coupler at the centre frequency of 2.4 GHz is fabricated and examined. Both simulated and measured results are presented, and good agreement between them is observed. View full abstract»

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  • 1.3 μm, 50 Gbit/s electroabsorption modulators integrated with DFB laser for beyond 100G parallel LAN applications

    Publication Year: 2011 , Page(s): 708 - 710
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (326 KB)  

    A 1.3 m, 50 Gbit/s electroabsorption modulator integrated with a DFB laser for future parallel LAN, the total data rate of which is over 100 Gbit/s, is developed. Very clear eye openings after 40 km transmission under 50 Gbit/s operation on singlemode fibre are demonstrated for eight wavelengths with discrete packages for the first time. View full abstract»

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  • Active-fault-alarm based pre-restoration for multicast

    Publication Year: 2011 , Page(s): 710 - 711
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (217 KB)  

    The active fault alarm (AFA) has been developed to achieve fast recovery of various network services, but the false-alarm still exists when applied to multicast restoration. To solve this problem, an AFA based pre-restoration (AFA-PR) scheme is proposed. The AFA-PR scheme takes full advantage of the AFA technologies, and allows establishing in advance a segment of the pre-restoration path for each suffered leaf on the multicast tree. Simulation results suggest the achievement of better performance by the new mechanism and show that the AFA-PR can solve the false-alarm problem efficiently. View full abstract»

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  • Demonstration of 10 Gbit/s transmission over 900 km SMF with 400 ns adaptation time using full-field EDC

    Publication Year: 2011 , Page(s): 711 - 713
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (217 KB)  

    This reported work significantly extends the reach of 10Gbit/s on-off keying singlemode fibre (SMF) transmission using full-field based electronic dispersion compensation (EDC) to 900 km. In addition, the EDC balances the complexity and the adaptation capability by employing a simple dispersive transmission line with static parameters for coarse dispersion compensation and 16-state maximum likelihood sequence estimation with Gaussian approximation based channel training for adaptive impairment trimming. Improved adaptation times of less than 400 ns for a bit error rate target of 10-3 over distances ranging from 0 to 900 km are reported. View full abstract»

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  • Fibre heterostructure for simultaneous strain and temperature measurement

    Publication Year: 2011 , Page(s): 713 - 714
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (162 KB)  

    Reported is an experimental study of a novel fibre heterostructure that utilises multimode interference employing two multimode fibre sections to allow simultaneous measurement of both strain and temperature. By measuring two peak wavelengths, strain and temperature can be determined with a demonstrated sensitivity to strain of 0.35 pm/ in the strain range 0-1556 and a temperature sensitivity of 11.16 pm/°C in the temperature range 10-30°C. View full abstract»

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  • Bend induced spectral changes in fibre Bragg gratings and their applications for simultaneous measurement

    Publication Year: 2011 , Page(s): 714 - 716
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (143 KB)  

    A report is presented on the interesting bending effect of cladding mode resonances in fibre Bragg gratings (FBGs). It is observed that a serial of new cladding mode resonances can arise under bending and the new and the original cladding mode resonances have opposite trends in amplitude change and wavelength shift when the curvature varies. The discovery provides an effective new way to discriminate between bend and strain or bend and temperature when using only a single uniform FBG. 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