Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 20, 4 October 1973
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Volume 9, Issue 20
4 October 1973
Some data for the design of low-crosspolarisation feeds
- Author(s): S.I. Ghobrial
- Source: Electronics Letters, Volume 9, Issue 20, p. 465 –466
- DOI: 10.1049/el:19730340
- Type: Article
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p.
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–466
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Some data, concerning the variation of the dimensions of low-crosspolarisation feeds with the semiangular aperture of paraboloidal reflectors, are presented in the form of curves. The curves are useful in the design of reflector-antenna feeds for dual-polarisation systems.
Pseudorandom Poisson-process generator
- Author(s): F. de Coulon and P.A. Rumley
- Source: Electronics Letters, Volume 9, Issue 20, p. 466 –467
- DOI: 10.1049/el:19730341
- Type: Article
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–467
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A method for generating an impulse train or a binary signal (random telegraph waveform) with pseudorandom Poisson statistics is described. It uses the properties of the binomial distribution to approach the Poisson distribution in the limit. A simple digital-hardware implementation, based on this method, is presented, and some test results are given.
Local form of the radiation condition: application to curved dielectric structures
- Author(s): L. Lewin
- Source: Electronics Letters, Volume 9, Issue 20, p. 468 –469
- DOI: 10.1049/el:19730342
- Type: Article
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p.
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–469
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The form taken by the radiation condition in the local co-ordinate system relevant to a curved radiating structure is not the same as it is at very great distances. It may contain a term that appears as if it were an incoming or growing wave. A detailed analysis has been made of the appropriate form of the condition in the cylindrical and toroidal systems, and has been applied to radiation form curved dielectric slabs and fibres.
Nonminimum-phase difficulties in muitivariable-control-system design
- Author(s): D.H. Mee and R.S. Hannah
- Source: Electronics Letters, Volume 9, Issue 20, p. 469 –470
- DOI: 10.1049/el:19730343
- Type: Article
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p.
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–470
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Much attention has been paid to the design of the numerator functions in a multivariable control problem. A paper by Mayne presents an essentially practical approach to the problem of multivariable design, and removes some of the restrictions of Rosenbrock's earlier inverse Nyquist method. The letter points out that there are still some major unsolved problems relating to the design of the numerator functions.
Limitation of m.t.i. improvement factor due to oscillator instability
- Author(s): R. Nitzberg
- Source: Electronics Letters, Volume 9, Issue 20, p. 470 –471
- DOI: 10.1049/el:19730344
- Type: Article
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p.
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The clutter-cancellation limitation of an m.t.i. signal processor which is due to oscillator instability, has been analysed by modelling the oscillator as a narrowband random process. The analysis predicts that the clutter cancellation will almost independent of range. This contrasts with the results of other analyses that model the oscillator's nonsinusoidal behaviour as a frequency change between transmitted pulses. These predict a range-dependent clutter cancellation.
Variable delay for acoustic surface waves by electro-acousto-optic interaction
- Author(s): M. Luukkala and P. Meriläinen
- Source: Electronics Letters, Volume 9, Issue 20, p. 471 –472
- DOI: 10.1049/el:19730345
- Type: Article
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–472
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Continuosly variable analogue delay is demonstrated by using reflections from a laser-light-induced impedence discontinuity on a photoconductive layer evaporated on an LiNbO3 delay line at 75 MHz. −30dB reflection loss is obtained with a delay range of 20 μs.
All n–p–n 4-quadrant analogue multiplier
- Author(s): M. McGinn
- Source: Electronics Letters, Volume 9, Issue 20, p. 472 –473
- DOI: 10.1049/el:19730346
- Type: Article
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A technique is described that utilises the addition of logarithms in an all n–p–n bipolar configuration, to derive the algebraic product of two variables. The circuit is ideal for integrated-circuit implementation, and uses a simple method of distortion cancellation that is shown to be independent of device current gain β and base-spreading resistance.
Efficient numerical solution of the transmission-line equivalent-circuit model of a semiconductor
- Author(s): M.A. Green and J. Shewchun
- Source: Electronics Letters, Volume 9, Issue 20, p. 474 –475
- DOI: 10.1049/el:19730347
- Type: Article
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A numerical algorithm is described that allows the transmission-line equivalent-circuit model of a semiconductor to be solved very efficiently. The technique is shown to be about three times as efficient as the ‘transmission-matrix’ approach for computing the small-signal a.c. properties of semiconductor devices from the equivalent-circuit model.
Detection of phosphorus in heavily diffused silicon by He+ backscattering
- Author(s): C.R. Allen and C.R. Thomas
- Source: Electronics Letters, Volume 9, Issue 20, p. 475 –477
- DOI: 10.1049/el:19730348
- Type: Article
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Application of the alpha-backscattering technique has allowed monitoring of the fractions of nonsubstitutional phosphorus in phosphorus-diffused silicon crystals. The nonsubstitutional fraction is found to increase rapidly with depth into the profile. Present sensitivity is estimated at 1015 atoms cm−2.
Effect of unity-rank feedback on the transfer-function matrix of a multivariable system
- Author(s): H. Seraji
- Source: Electronics Letters, Volume 9, Issue 20, p. 477 –478
- DOI: 10.1049/el:19730349
- Type: Article
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Simple expressions relating a unity-rank feedback matrix to the resulting closed-loop transfer-function matrix in a linear multivariable system are derived. Some interesting results are deduced from these expressions, and an example is given.
Automation of the synthesis of asynchronous sequential circuits
- Author(s): C. Metaxaki-Kossionides
- Source: Electronics Letters, Volume 9, Issue 20, p. 478 –479
- DOI: 10.1049/el:19730350
- Type: Article
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The automation of a method for synthetising asynchronous sequential circuits is reported. The method is suitable for circuits having transition and level inputs. Inclusion relations between state-pair sets and partitions are used for the selection of suitable partitions for an economic race-free state assignment of minimum transition time.
Reply to ‘Comment on Use of synchronised dither in pseudorandom-sequence testing’
- Author(s): H. Banasiewicz ; S.E. Williamson ; W.F. Lovering
- Source: Electronics Letters, Volume 9, Issue 20, page: 480 –480
- DOI: 10.1049/el:19730351
- Type: Article
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Erratum: Attenuation in an elliptic waveguide
- Author(s): L. Lewin and A.M.B. Al-Hari
- Source: Electronics Letters, Volume 9, Issue 20, page: 480 –480
- DOI: 10.1049/el:19730352
- Type: Article
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Erratum: Experimental determination of attenuation in corrugated circular waveguides
- Author(s): A.D. Olver ; P.J.B. Clarricoats ; S.L. Chong
- Source: Electronics Letters, Volume 9, Issue 20, page: 480 –480
- DOI: 10.1049/el:19730353
- Type: Article
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