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Electronics Letters

Issue 17 • Date August 18 2011

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Displaying Results 1 - 25 of 44
  • In brief

    Publication Year: 2011 , Page(s): 942
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  • Interview

    Publication Year: 2011 , Page(s): 942
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (103 KB)  

    Dr Oscar Luc??a from the University of Zaragoza talks about the research behind the Letter `Configurable snubber network for efficiency optimisation of resonant converters applied to multi-load induction heating?? on page 989. View full abstract»

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  • Inside view

    Publication Year: 2011 , Page(s): 943 - 944
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    As research engineers, our main job is to anticipate the needs of optical networks and fi nd the adequate response to them. Among these needs, there is, of course, the increase of total transmitted data. However, fi bre transmission becomes more and more challenging as bit rate increases because the tolerance to optical noise and propagation effects is reduced which limits the maximum transmission reach of optical systems. View full abstract»

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  • A calming influence

    Publication Year: 2011 , Page(s): 944
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (90 KB)  

    A simple passive electrical circuit that is able to suppress Q-switching instabilities in mode-locked semiconductor quantum dot lasers has been demonstrated. By connecting frequency-selective electrical components to the absorber section of a monolithic two-section tapered laser, a team at the Technical University of Darmstadt in Germany were able to eliminate the Q-switching instabilities and extend the stable mode-locking range. View full abstract»

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  • Compact dual-band circularly-polarised cavity-backed slot antenna

    Publication Year: 2011 , Page(s): 947 - 948
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (346 KB)  

    A compact dual-band and dual circular-polarisation cavity-backed slot antenna using the inverted configuration is presented. The proposed antenna consists of two subarrays providing left-hand circular-polarisation for the 12 GHz band and right-hand circular-polarisation for the 14 GHz band, respectively. The dual-band and dual-polarisation antenna is fed by a microstrip network printed on the top of the dielectric substrate (Rogers R/T Duroid 5880 substrate, with εr=2.2 and thickness of 0.127=mm), while a metallic cavity of a square shape is placed on the bottom side of the same substrate. With this simple arrangement, a compact design is realised for a dual-band circularly-polarised slot antenna. Details of the proposed antenna design are described and experimental results are presented. View full abstract»

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  • Optically controlled reconfigurable antenna for cognitive radio applications

    Publication Year: 2011 , Page(s): 948 - 950
    Cited by:  Papers (9)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    A new optically controlled reconfigurable antenna for cognitive radio is presented. The antenna can operate at an ultra-wideband and three narrow bands by controlling four photoconductive switches. The bandwidth of the ultra-wideband is 2.65 to 10.3 GHz. The bandwidths of three narrow bands are 7.10 to 8.01 GHZ, 3.55 to 5.18 GHz, and 5.12 to 6.59 GHz, respectively. View full abstract»

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  • Compact dual-band-notched UWB planar monopole antenna with modified SRR

    Publication Year: 2011 , Page(s): 950 - 951
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (223 KB)  

    To prevent interference problems due to existing nearby communication systems within an ultra-wideband (UWB) operating frequency, a compact dual-band-notched UWB antenna is presented. This antenna consists of a trapezoidal ground plane with a rectangle slot, a Y-shaped monopole used as the radiator, together with a modified complementary co-directional splitering resonator (SRR) etched on the radiation patch, which leads to the desired dual notched bands for lower and upper bands of the WLAN. Experimental results show that the designed antenna, with compact size of 24×25×mm, has a wide bandwidth covering 3.05-14.2 GHz, realising dual notched bands of 5.14-5.36 and 5.74-6.07 GHz. View full abstract»

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  • Dual-polarised patch antenna with low cross-polarisation and high isolation for WiMAX applications

    Publication Year: 2011 , Page(s): 952 - 953
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    A coax-feed dual-polarised patch antenna with low cross-polarisation and high port isolation is presented. The proposed antenna contains two pairs of narrow slots along the diagonals and two pairs of T-shaped slots along the centrelines, which change the path of the current and keep the cross-polarisation under -38-dB. By introducing two short pins, the isolation between the two ports remains more than 40-dB in the whole bandwidth. Moreover, the proposed antenna achieving a 10-dB return loss bandwidth of 2.15-2.72-GHz has a compact structure, thus making it easy to be extended to form an array, which can be used as the base station antenna for WiMAX applications. View full abstract»

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  • Reconfigurable dipole-chassis antennas for small terminal MIMO applications

    Publication Year: 2011 , Page(s): 953 - 955
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (235 KB)  

    Presented is a wideband reconfigurable MIMO antenna, which is the combination of a reconfigurable balanced dipole and a two-port chassis antenna. Measurements show that the prototype antenna can tune the operating frequency from 646 to 848 MHz and 1648 to 2074 MHz with instantaneous bandwidths of 14-93 MHz. The proposed MIMO antenna provides low correlation and high efficiency within these operating bands. View full abstract»

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  • CMOS clock buffer with reduced supply noise sensitivity

    Publication Year: 2011 , Page(s): 955 - 956
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (169 KB)  

    A CMOS clock buffer that minimises the period jitter due to supply noise is presented. The proposed buffer features a highpass noise cancellation circuit which is able to halve the output period jitter compared to a standard CMOS buffer. By avoiding large decoupling capacitors to filter out the supply noise, this technique enables a more efficient use of the active area when compared to traditional jitter reduction techniques. The additional current consumption for the noise cancellation circuit is a fraction (up to 10%) of the amount of current allocated to the clock buffer. View full abstract»

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  • Compact and low-power continuous-time derivative circuit

    Publication Year: 2011 , Page(s): 956 - 957
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (139 KB)  

    A new circuit to compute a continuous-time derivative is introduced. Comprising only one capacitor and six to eight transistors, this derivative circuit occupies very little real estate and consumes limited power, making it particularly well suited to low-power and array applications such as imager systems and sub-banded audio-processing applications. A description of the operation of this circuit is provided along with results from a circuit fabricated in a standard 0.5 μm CMOS process. View full abstract»

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  • Wideband balanced combline filter with extended common-mode suppression

    Publication Year: 2011 , Page(s): 957 - 959
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (186 KB)  

    A wideband differential-mode combline filter with a tapped-line input is presented. High suppression of the common-mode and a small size are two important features of the proposed filter. The filter combines two conventional combline filters connected together through discrete capacitors. The realised sixth-order balanced combline filter has a 3 dB bandwidth of 74% from 0.88 to 1.9 GHz. The common-mode suppression is larger than 29 dB, even up to 5 GHz. Furthermore, the filter core size (0.026λg2) is substantially smaller than previously reported wide band balanced filters. View full abstract»

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  • Modified Smith predictor and controller for time delay processes

    Publication Year: 2011 , Page(s): 959 - 961
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (97 KB)  

    A modified Smith predictor control scheme is proposed for controlling stable, integrating and unstable processes with time delay. The two-degrees-of-freedom control structure along with simple tuning rules result in improved servo and regulatory performances by independently tuning a single control parameter. A convenient property of the proposed control scheme is that it decouples the setpoint response from the load response. The H2 optimal control method is used to design the setpoint tracking controller and an optimal IMC filter is proposed to design a PID controller that produces good disturbance rejection performances. Simulation results show the simplicity and superiority of the proposed method compared with some reported methods. View full abstract»

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  • Correlation of robust Haar-like feature

    Publication Year: 2011 , Page(s): 961 - 962
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (65 KB)  

    Presented is a new template matching method using correlation based on robust Haar-like features. The main result of this reported work is the robust computation of Haar-like features to limit the influence of outliers and any effect that may cause a deviation from a perfect match. Simulation results show that the correlation of robust Haar-like features outperforms the correlation of Haar-like features, phase correlation, and the normalised cross-correlation while having comparable results with orientation correlation and robust correlation of the second derivatives. View full abstract»

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  • No-reference blur index using blur comparisons

    Publication Year: 2011 , Page(s): 962 - 963
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (103 KB)  

    Presented is a new no-reference blur index for still images that is based on the observation that it can be difficult to perceive between versions of an image blurred to different degrees. A `re-blurred` image is produced by intentionally blurring the test image. Local sample statistics are computed in the vicinity of detected edges of the original and re-blurred images, respectively. These are differenced and normalised to construct a new blur index. Experimental results on four simulated blur databases and on the Real Blur Image Database show that the proposed method obtains high correlations with test subjective quality evaluations. View full abstract»

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  • Balanced parallelised frugal IPv6 lookup algorithm

    Publication Year: 2011 , Page(s): 963 - 965
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (197 KB)  

    Transition to IPv6 is inevitable, since the last IPv4 addresses have been recently allocated. Existing IPv6 lookup algorithms are not scalable as the IPv6 addresses are four times longer than the IPv4 addresses. Proposed is a novel IPv6 lookup algorithm which is far more scalable than previous solutions. View full abstract»

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  • CPF-HAF estimator of polynomial-phase signals

    Publication Year: 2011 , Page(s): 965 - 966
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (127 KB)  

    A simple and effective modification of the high-order ambiguity function (HAF) is introduced. The number of phase differentiations is decreased to two with respect to the HAF. The obtained signal has a cubic phase, the parameters of which can be estimated using the cubic phase function (CPF) in the final stage. The SNR threshold of the proposed modification is reduced for 9 dB with respect to the HAF, while the MSE is about 2 dB less. View full abstract»

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  • Low complexity bit metric generation for PAM signals based on nonlinear function

    Publication Year: 2011 , Page(s): 966 - 967
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (180 KB)  

    The bit metric is used for soft-decision decoding in bit-interleaved coded modulation (BICM) systems. The complexity of bit metric generation increases rapidly for high-order modulation. Proposed is a nonlinear function and a recursive formula to generate the bit metric for the pulse amplitude modulation (PAM) signal with any modulation order. This method can reduce the computational complexity greatly and has similar performance compared with the optimal bit metric. This method can also be used for a quadrature amplitude modulation signal which can be decomposed into two independent PAM signals. View full abstract»

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  • Ensemble of predictors and laser induced breakdown spectroscopy for certifying coffee

    Publication Year: 2011 , Page(s): 967 - 969
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (94 KB)  

    The commercial demand and the economic value of roasted and ground coffee (RGC) are intrinsically related to its quality. Brazilian RGC has been certified for quality based on a score assigned by expert tasters. However, intrinsic costs and the lack of fast techniques make large-scale analysis prohibitive. Laser induced breakdown spectroscopy (LIBS) is a promising technique for RGCs, however it demands an accurate coupled-model for pattern recognition. In this reported work, two ensemble methods in ranges around 680 nm of LIBS spectra are employed to construct ensembles of decision trees for RGC classification. Results show accuracies above 84 for ensemble methods in some spectral ranges. The best performances were in the range 670 690 nm, making viable the design of dedicated equipment with low-cost devices. View full abstract»

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  • Pico-strain measurement using optimised fibre Fabry-Perot sensor system with reference wavelength

    Publication Year: 2011 , Page(s): 969 - 970
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (175 KB)  

    The optimisation of noise properties is demonstrated in an interferometric fibre Bragg grating defined Fabry-Perot sensor system. The signal-to-noise ratio is maximised by matching the spectra of the two gratings and the path length differences of the two tandem interferometers. The environmental effects on the interrogation interferometer are monitored with a reference wavelength. A phase resolution close to the theoretical noise limit of -85 dB above 60 Hz is achieved with a corresponding strain resolution of 1.52 pε/Hz1/2 using a 4 m-long cavity. View full abstract»

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  • 10 Gbit/s burst-mode limiting amplifier with switched time constants for fast settling and large CID tolerance

    Publication Year: 2011 , Page(s): 970 - 972
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (267 KB)  

    A 10 Gbit/s DC-coupled burst-mode limiting amplifier (BM-LA) with two-level integration time constants for fast/slow feedback offset cancellation respectively during preamble/payload of the incoming bursts is presented. A 10 Gbit/s APD-based burst-mode receiver (BM-Rx) using this feedback type BM-LA achieves a Rx sensitivity of -30.6 dBm under a loud/soft ratio of 24.6 dB at a bit error rate of 10-3 within a short settling time of only <;51 ns. View full abstract»

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  • Free-space optical transmission with orbital angular momentum division multiplexing

    Publication Year: 2011 , Page(s): 972 - 973
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    The experimental demonstration of a free-space optical transmission system with orbital angular momentum (OAM) division multiplexing is reported. Two beams have been multiplexed with different values of the azimuthal index l, and hence carrying different OAM, at a wavelength of 1550 nm. The first beam (l = 0) is nearly Gaussian and it features an OAM equal to zero. The second beam (l = 1) is an optical vortex produced by means of a suitable computer-generated hologram, which shows an intensity pattern with a doughnut shape and possesses an OAM of -h per photon. A binary intensity modulation at 1.25 Gbit/s has been applied to each OAM channel and an interferometer with Dove prisms has been exploited for OAM demultiplexing. View full abstract»

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  • Long-haul WDM transmission of 448 Gbit/s polarisation-division multiplexed 16-ary quadrature amplitude modulation using coherent detection

    Publication Year: 2011 , Page(s): 973 - 975
    Cited by:  Papers (6)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (199 KB)  

    The transmission of a PDM-QAM16 signal at 400 Gbit/s over 1200 km in a WDM environment is demonstrated. The WDM link carrying 40 PDM-QAM16 channels modulated at the same bit rate incorporates ultra-low-loss, large effective area fibre and erbium-doped fibre amplifiers. View full abstract»

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  • Transmission of 40 x 200 Gbit/s polarisation division multiplexed quadrature phase shift keyed channels over 6600 km

    Publication Year: 2011 , Page(s): 975 - 976
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (318 KB)  

    The first transoceanic WDM transmission at 200 Gbit/s, using PDM-QPSK, coherent detection, ultra-low-loss large effective area fibre and erbium-doped fibre amplifiers is demonstrated. View full abstract»

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  • Hybrid microfabrication and 5-DOF levitation of micromachined electrostatically suspended gyroscope

    Publication Year: 2011 , Page(s): 976 - 978
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (297 KB)  

    A newly designed electrostatically suspended rotational microgyroscope, with optimised electrode structures and interconnections, is presented. Hybrid MEMS manufacturing techniques, including surface micromachining fabrication of thin film electrodes and interconnections, integration fabrication of thick nickel structures using UV-LIGA, DRIE of silicon rotor, microassembly and solder bonding, are employed to fabricate this device. Five-degree-of-freedom stable levitation control of the rotor, with fast initial levitation process and good time synchronisation at the null position for each axis, has been demonstrated. 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