Electronics Letters

Issue 21 • 12 Oct 1995

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Displaying Results 1 - 25 of 60
  • Single-capacitor MOSFET-C integrator using OTRA

    Publication Year: 1995, Page(s):1796 - 1797
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    A highly linear MOS operational transresistance amplifier (OTRA) integrator with reduced number of capacitors and MOSFETs is proposed. Only one capacitor is required for an integrator to achieve cancellation of MOSFET nonlinearities. The proposed integrator is insensitive to the effects of parasitic capacitances and can be interconnected without adding any buffers. Experimental results are given t... View full abstract»

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  • Low loss achieved in sol-gel based silica-on-silicon integrated optics using borophosphosilicate glass

    Publication Year: 1995, Page(s):1833 - 1834
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    Polarisation-independent propagation losses of 0.2 dB/cm are reported for near-infrared silica-on-silicon channel guides formed using sol-gel borophosphosilicate glass deposited by repetitive spin coating and rapid thermal annealing. The low loss is ascribed to a reduction in process temperature, which has allowed a total glass thickness of 30 μm. The use of two dopants allows the glass viscosi... View full abstract»

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  • State-space synthesis of log-domain oscillators

    Publication Year: 1995, Page(s):1797 - 1799
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    A state-space synthesis of oscillators based on log compression is presented. The approach is an extension of the recently proposed current-mode log domain filter synthesis methodology. Both simulated and measured results demonstrate that very low distortion oscillators can be synthesised at several megahertz using simple processing building blocks and off-the-shelf transistor arrays View full abstract»

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  • Six wavelength laser array with integrated amplifier and modulator

    Publication Year: 1995, Page(s):1835 - 1836
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A six-wavelength laser array with an integrated amplifier and modulator designed for transmission of a single selectable wavelength is demonstrated. The lasers have thresholds of ~20 mA, and the single-step printed gratings yield an average channel spacing of 200 GHz. Output powers through the modulator of several milliwatts are obtained from all six lasers when 75 mA is applied to the amplifier View full abstract»

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  • 5 bit guided-wave SNS transfer characteristics

    Publication Year: 1995, Page(s):1799 - 1800
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    The experimental transfer characteristics of a three-channel 5 bit symmetrical number system (SNS) guided-wave ADC are reported. The SNS preprocessing provides resolution greater than 1 bit per interferometer. The results serve to demonstrate the feasibility of the SNS ADC concept View full abstract»

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  • Transverse junction waveguide InGaAs/lnP photodiode

    Publication Year: 1995, Page(s):1872 - 1873
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    A novel transverse InP/InGaAs/InP pn junction waveguide photodiode is demonstrated using in situ zinc diffusion before a regrowth step inside an organometallic vapour phase epitaxy reactor. The detector exhibits high speed, low leakage current, low capacitance and high breakdown voltage characteristics View full abstract»

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  • Technique for monitoring slow interface trap characteristics in MOS capacitors

    Publication Year: 1995, Page(s):1880 - 1881
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (148 KB)

    A new experimental technique presented in the Letter simultaneously extracts the trap response time as well as trap density and energy in the silicon bandgap. The technique is illustrated by measuring the trap density increase in a MOS capacitor due to constant current stressing and is compared with the results obtained using the conventional quasistatic C/V technique View full abstract»

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  • Cryptanalysis of the blind signatures based on the discrete logarithm problem

    Publication Year: 1995
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (88 KB)

    In a recent paper (see L. Harn, ibid., vol.31, no.14, pp.1136, 1995), Harn claims that certain signature schemes are not true blind signatures. In this comment we prove that this claim is incorrect. Harn's attempt to cryptanalyse the schemes is incorrect, since the proposed relationship, which is used to trace the signature by the signer, is an invariant that is satisfied by any two pairs of signe... View full abstract»

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  • Levitation of a micromachined rotor for application in a rotating gyroscope

    Publication Year: 1995, Page(s):1845 - 1846
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    The design of a micromachined rotating gyroscope is described, incorporating an electromagnetically levitated aluminium rotor. The coil design for levitation produces good lateral stability. A 400 μm diameter, 12 μm thick rotor is levitated to a height of 30 μm View full abstract»

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  • Progressive DPCM system with block truncation coding

    Publication Year: 1995, Page(s):1821 - 1822
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A progressive DPCM system with a block truncation coding technique for encoding the prediction error is proposed. A classified progressive DPCM scheme is also proposed to make the progressive DPCM system reduce the bit rate more efficiently under the limited bit rate. The simulation results indicate that the proposed method achieves excellent image quality under 2 bit/pixel and is superior to othe... View full abstract»

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  • General algorithms for reduced-adder integer multiplier design

    Publication Year: 1995, Page(s):1800 - 1802
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The problem of reducing the number of adders required to perform shift-and-add multiplication is addressed for hardware and software applications. Algorithms invented for each of these applications are compared and found to have similar performances in general. Improved results are achieved by selecting the best design of the two View full abstract»

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  • Radiowave amplitude scintillation intensity: Olympus satellite measurements and empirical model

    Publication Year: 1995, Page(s):1873 - 1875
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    The authors summarise the results of a 1 year measurement of earth-space radiowave amplitude scintillation using the Olympus satellite 20 GHz beacon signal received at Sparsholt (51.585°N. 1.5033°W), UK at a path elevation of 28.74°. The diurnal and seasonal trends of scintillation intensity are discussed. A generalised semi-empirical model is obtained, which gives excellent fit to the... View full abstract»

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  • Determining the aspect ratio of a CCD camera

    Publication Year: 1995, Page(s):1820 - 1821
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The aspect ratio is an essential parameter of a camera. It is the ratio of the distances between two adjacent pixels in the frame buffer along the horizontal and vertical directions, respectively. A simple and fast method is proposed for calculating the aspect ratio using a trihedral normal angle. The focal length can also be derived. Neither nonlinear equations nor iterative procedures are used i... View full abstract»

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  • Distributed coding for data representation of back-propagation neural network classifiers

    Publication Year: 1995, Page(s):1852 - 1854
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    A new distributed input coding is derived by distributing the feature variables over a number of input nodes based on the distribution of the training data. Using this coding method representation. The range of each input node will be fully optimised: this enables the network to converge at a higher rate during training. The coding method also enables the network to maintain the generalisation cap... View full abstract»

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  • Very efficient CMOS low-voltage output stage

    Publication Year: 1995, Page(s):1830 - 1831
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    A novel CMOS low-voltage output stage is proposed which is based on a class AB common source configuration. It provides high drive capability while using output transistors with low aspect ratios. A 2 mA peak-to-peak output current is achieved with a 1.5 V power supply and a maximum aspect ratio of 375/2. The output stage includes a very simple current control which accurately sets the bias condit... View full abstract»

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  • Red and orange Pr3+/Yb3+ doped ZBLAN fibre upconversion lasers

    Publication Year: 1995, Page(s):1842 - 1843
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    Room temperature continuous-wave upconversion laser oscillation at 635 nm is reported for a Yb3+sensitised Pr3+-doped fluorozirconate fibre cavity pumped by a single semiconductor laser operating at a wavelength near 860 nm. Using a similar setup, upconversion lasing at a wavelength of 602 nm has also been obtained View full abstract»

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  • Universal filter using unity-gain cells

    Publication Year: 1995, Page(s):1817 - 1818
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (144 KB)

    The authors propose the use of both current and voltage followers for implementation of a universal filter. The aim is to show how, by using only unity-gain cells as active components, a universal filter can be obtained with improved performance over classical filters View full abstract»

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  • Extension of the transmission line matrix (TLM) method in its application to lumped networks

    Publication Year: 1995, Page(s):1849 - 1851
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    An extension of the TLM method applicable to generalised lumped networks is outlined. It is shown from basic circuit theory that two separate branch admittance matrices are required to satisfy more general circuit conditions, as opposed to a single matrix for the more restricted cases studied previously View full abstract»

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  • Extending the Hastad attack to LUC

    Publication Year: 1995, Page(s):1827 - 1828
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The authors show that the attack of Hastad on broadcast messages using the RSA cryptosystem extends to the case where the public keys are different, and that the attack is also applicable to the LUC system, with the same security parameters View full abstract»

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  • High temperature operation with low-loss coupling to fibre for narrow-beam 1.3 μm lasers with butt-jointed selective grown spot-size converter

    Publication Year: 1995, Page(s):1838 - 1840
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    High temperature operation is demonstrated for narrow-beam 1.3 μm lasers with butt-jointed selectively grown spot-size converters. Low thresholds of 5.6 mA and 15.8 mA at 25°C and 85°C and a maximum operating temperature of 134°C were obtained. Low loss coupling to fibre of <1.8 dB was achieved in the temperature range from 25°C to 85°C with an output power up to 30 mW View full abstract»

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  • Integrated uniplanar microwave part of transmitter-receiver with active antennas

    Publication Year: 1995, Page(s):1846 - 1847
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A new concept, design and realisation of an integrated uniplanar microwave part of a transmitter-receiver with active antennas is presented. All circuits are realised using the three coplanar strips technique (TCS). The whole subsystem is realised with one low cost MESFET (NE72089A). The common oscillator has an electronically controlled frequency. The model is realised at a transmitting frequency... View full abstract»

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  • 980 nm diode pumped erbium3+/ytterbium3+ doped Q-switched fibre laser

    Publication Year: 1995, Page(s):1836 - 1837
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The latest results obtained with an acousto-optically Q-switched erbium3+/ytterbium3- diode pumped fibre laser are reported. The use of Er:Yb enables short high power pulses to be obtained. Pulse durations of 15 ns and peak powers >50 W have been achieved at a 500 Hz repetition rate View full abstract»

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  • Dynamic characteristics of a 1.3 μm laser diode integrated with a spot-size converter coupled to a silica planar lightwave circuit

    Publication Year: 1995, Page(s):1858 - 1860
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Dynamic characteristics are clarified for a laser diode integrated with a spot-size converter coupled to a silica planar lightwave circuit. The laser was developed with a butt-jointed selectively grown spot-size converter. A maximum coupling efficiency of -0.74 dB was achieved. Bit error rate performances are estimated to clarify the allowable reflection when optical feedback from the fibre output... View full abstract»

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  • Reduced-state sequence estimation of OFDM signal in frequency selective Rayleigh fading channels

    Publication Year: 1995, Page(s):1802 - 1803
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    A reduced-state sequence estimation (RSSE) for detecting orthogonal frequency division multiplexing (OFDM) signals transmitted over frequency selective Rayleigh fading channels is proposed. The Viterbi algorithm (VA) is used to search for the best path through the reduced-state trellis. Simulation results show that the proposed scheme reveals improved performance in symbol error rate (SER) compare... View full abstract»

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  • Polarisation-independent wavelength conversion using nonlinear optical loop mirror

    Publication Year: 1995, Page(s):1862 - 1863
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    A polarisation-independent all-optical wavelength conversion technique is proposed that uses a nonlinear optical loop mirror (NOLM). When the polarisation state of the input signal light is varied, wavelength-converted signals exhibit a converted power fluctuation of only 0.6 dB, and the receiver sensitivity does not change View full abstract»

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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.

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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