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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 16, Issue 23, 6 November 1980

Volumes & issues:

Volume 16, Issue 23

6 November 1980

Pulsed V-band m.b.e. Si IMPATT diodes
Effects of radiation on doped silica core optical fibres
  • Author(s): A. Rosiewicz ; M.H. Gray ; J. Irven ; J.G. Titchmarsh ; P.W. Black
  • Source: Electronics Letters, Volume 16, Issue 23, p. 866 –867
  • DOI:  10.1049/el:19800618
  • Type: Article
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  • p. 866 –867 (2)
    The effect of γ-radiation on SiO2/GeO2 core fibres for times between 10−3 s and 1 h have been measured. Between 10−1 s and 30 min, these fibres offer a large improvement over previously published data. Addition of P2O5 in the core of these fibres reduces the transient response at the expense of long-term response. The P2O5:GeO2 ratio controls the level of response.
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Deriving stability criteria for nonlinear circuits with application to worst-case noise margin of I2L
  • Author(s): E. Seevinck
  • Source: Electronics Letters, Volume 16, Issue 23, p. 867 –869
  • DOI:  10.1049/el:19800619
  • Type: Article
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  • p. 867 –869 (3)
    A simplified method of deriving stability criteria for nonlinear circuits is introduced. Unlike the conventional approach which requires construction of a small-signal equivalent circuit and identification of loops, only the basic nonlinear circuit equations are needed. The method is applied to the calculation of the worst-case static noise margin of I2L, which is shown to be much smaller than a recently published result.
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Simple structure high isolation multi/demultiplexer
  • Author(s): T. Tanaka ; H. Serizawa ; Y. Tsujimoto
  • Source: Electronics Letters, Volume 16, Issue 23, p. 869 –870
  • DOI:  10.1049/el:19800620
  • Type: Article
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  • p. 869 –870 (2)
    Wavelength division multiplexing (w.d.m.) techniques, which transmit light signals with different wavelengths through a single optical fibre, are required to increase transmission capacity. The letter describes a new type of multi/demultiplexer using an interference filter and a single graded-refractive-index (g.r.i.n.) rod lens. It has a simple structure and a low near-end crosstalk (less than −50 dB).
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Approximate formulas for frequency dependence of microstrip parameters
Ballistic electron transport in a nonparabolic band
Field probe for measuring both amplitude and phase of antenna radiation patterns
  • Author(s): D.E.N. Davies  and  S.M. Vakil
  • Source: Electronics Letters, Volume 16, Issue 23, p. 873 –875
  • DOI:  10.1049/el:19800623
  • Type: Article
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  • p. 873 –875 (3)
    Small probe antennas are often used for measuring the amplitude and phase of antenna radiation patterns. Phase measurements are complicated by the need for an accurate r.f. phase reference to be conveyed to or from the mobile probe. The letter describes a scheme for simplifying such measurements by the use of a probe unit which backscatters incident energy after subjecting it to a single sideband frequency translation. The scheme has application to both compact ranges and to the measurement of profile errors in reflector antennas by phase measurements within the aperture plane.
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Numerical evaluation of logarithmic receiver thresholds
Holographic measurement of refractive-index profile of optical fibre preform
Backscatter attenuation measurements in graded index fibres
Method for reproducible l.p.e. growth of GaInAsP
Bond integrity evaluation using transmission scanning acoustic microscopy
Fibre refractive-index profiling by modified near-field scanning
Switched-capacitor lowpass filter without active components
L.P.C. speech recognition with random reference correlation
  • Author(s): A. Cohen  and  S. Beker
  • Source: Electronics Letters, Volume 16, Issue 23, p. 885 –886
  • DOI:  10.1049/el:19800631
  • Type: Article
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  • p. 885 –886 (2)
    A correlation estimation algorithm, based on random reference correlation (r.r.c.), is applied to the problem of speech recognition. The inherent ill-conditioning of the estimated autocorrelation matrix is dealt with by pre-emphasis and ridge regression. Distance measures are defined and used to characterise the performance of the recognition. Results with the ten-digit dictionary show that the new method is comparable with the conventional one in terms of recognition performance but much more efficient in terms of implementation.
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Evaluation of error probability for partial response systems
  • Author(s): K.M. Sundara Murthy  and  K.W. Cattermole
  • Source: Electronics Letters, Volume 16, Issue 23, p. 886 –888
  • DOI:  10.1049/el:19800632
  • Type: Article
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  • p. 886 –888 (3)
    A computation algorithm has been developed to evaluate the exact probability of error for partial response (p.r.) signals in the presence of intersymbol interference and additive Gaussian noise in a digital communication system for a wide range of signal/noise ratio and sampling time error. This can readily be used to study the performance of already familiar p.r. signals or any new p.r. format which can be composed from a general p.r. polynomial.
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High frequency stability of near-perfect active phase compensated integrators
Distribution of burst error lengths in Rayleigh fading radio channels
Intersymbol interference in misequalised coaxial systems
O.M. v.p.e. growth of AlGaSb and AlGaAsSb
InGaAsP/InGaAs heterojunction p-i-n detectors with low dark current and small capacitance for 1.3–1.6 μm fibre optic systems
  • Author(s): F. Capasso ; R.A. Logan ; A. Hutchinson ; D.D. Manchon
  • Source: Electronics Letters, Volume 16, Issue 23, p. 893 –895
  • DOI:  10.1049/el:19800637
  • Type: Article
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  • p. 893 –895 (3)
    A new long wavelength p-i-n photodetector, consisting of an In0.53 Ga0.47 As absorbing layer and an adjacent InGaAsP p-n junction is demonstrated. These diodes exhibit dark currents as low as 0.2 nA and a capacitance < 0.5 pF at − 10 V for a device area of 1.3 × 10−4 cm2. The external quantum efficiency is ⋍ 60% at λ = 1.3 μm for front illumination. A systematic study of the background doping of the quaternary layers using different InP sources is also reported.
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Measurements of refractive-index variation with free carrier density and temperature for 1.6 μm GaInAsP/InP lasers
Space charge limited current in an insulator at high fields
Extrinsic photoconductivity in platinum-doped silicon
Cheby̅shev time-domain deconvolution for transversal filter equalisers
  • Author(s): D. Preis  and  C. Bunks
  • Source: Electronics Letters, Volume 16, Issue 23, p. 899 –901
  • DOI:  10.1049/el:19800641
  • Type: Article
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  • p. 899 –901 (3)
    Design equations are presented for computing the N tap weights of a transversal filter equaliser. The associated time-domain deconvolution is performed subject to the Cheby̅shev (minimax) error criterion. Individual or pointwise deconvolution errors are controlled and minimised uniformly. This method offers an alternative to least square error or discrete Fourier transform designs wherein only the cumulative de-convolution error is minimised. Computationally, the Ascent algorithm is used which requires inversion of two (N + 1) × (N + 1) matrices followed by a finite number of elementary algebraic exchange operations. The equations needed to implement this algorithm are presented in a form suitable for digital computation.
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Comment: Novel insensitive lossless inductor simulation through inverse function generation
Reply: Novel insensitive lossless inductor simulation through inverse function generation

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