Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 1, 11 January 1973
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Volume 9, Issue 1
11 January 1973
Estimation in linear time-delay system with coloured observation noise
- Author(s): V. Shukla
- Source: Electronics Letters, Volume 9, Issue 1, p. 1 –2
- DOI: 10.1049/el:19730001
- Type: Article
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p.
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A sequential fixed-lag smoothing algorithm is derived here for linear systems, when it is assumed that the measurements contain the sum of signals with known time delays and are corrupted by coloured noise. The innovations approach is used to derive the algorithm that is suitable for online computations.
Small-signal noise analysis of p+–n–p+ BARITT diodes
- Author(s): A. Sjölund
- Source: Electronics Letters, Volume 9, Issue 1, p. 2 –4
- DOI: 10.1049/el:19730002
- Type: Article
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The noise sources in BARITT diodes are described. The noise measure is calculated numerically and compared with experimental results. The optimum noise measure at 8 GHz was determined by varying the device width for given current density and doping density. The best noise measure of 9 dB was obtained for a doping of 2.5 × 1015/cm3 and a current density of 60 A/cm2.
Pipeline array for square-root extraction
- Author(s): J.C. Majithia
- Source: Electronics Letters, Volume 9, Issue 1, p. 4 –5
- DOI: 10.1049/el:19730003
- Type: Article
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Pipelining an arithmetic process is a well known technique for improving the computation speed of the arithmetic algorithm. In the letter is proposed a pipeline version of the array for the extraction of square roots of binary numbers. It is shown that a significant speed improvement (on a throughout basis) can result by this modification of the conventional logic arrays.
Pulse broadening in multimode fibres excited by GaAs lasers
- Author(s): D. Schicketanz
- Source: Electronics Letters, Volume 9, Issue 1, p. 5 –6
- DOI: 10.1049/el:19730004
- Type: Article
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Pulse dispersion in multimode fibres depends strongly on mode excitation at the input and mode coupling in the fibre. Measurements on fibres of up to 160 m in length are given: pulse dispersion seems to follow a square-root law with the lengths of the fibres.
Improved binary multiplication system
- Author(s): N. Johnson
- Source: Electronics Letters, Volume 9, Issue 1, p. 6 –7
- DOI: 10.1049/el:19730005
- Type: Article
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An improved binary multiplication system is proposed employing a combination of lookup multiplication tables and addition units. The system is capable of operation at high speeds with complete accuracy.
Propagation and radiation characteristics of corrugated horns
- Author(s): P.J.B. Clarricoats and L.M. Seng
- Source: Electronics Letters, Volume 9, Issue 1, p. 7 –9
- DOI: 10.1049/el:19730006
- Type: Article
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A new method for predicting the radiation pattern of a corrugated horn is described which is especially relevant to horns with oblique semi-flare angles. Experimental and theoretical results are compared for a horn with a semi-flare angle of 110°. The solution of the characteristic equation is described in the throat region of the horn, and results are presented for the four lowest modes of propagation with 30° < θ1 < 160°.
Diffusion of hot electrons in n indium phosphide
- Author(s): C. Hammar and B. Vinter
- Source: Electronics Letters, Volume 9, Issue 1, p. 9 –10
- DOI: 10.1049/el:19730007
- Type: Article
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The diffusion-conefficient/field characteristic has been calculated for n indium phosphide. The resulting curves show several pearks and minima. The origin of these features is discussed.
Noise performance of gallium-arsenide and indium-phosphide injection-limited diodes
- Author(s): B. Källbäck
- Source: Electronics Letters, Volume 9, Issue 1, p. 11 –12
- DOI: 10.1049/el:19730008
- Type: Article
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Noise factors of gallium-arsenide and indium-phosphide injection-limited diodes have been calculated. The results show that it is generally preferable to bias the diodes to fields higher than the maximum-negative-mobility region if the appropriate boundary condition at the cathode can be maintained.
Optimum r.f.-power transport in nd-limited gallium-arsenide travelling-wave amplifiers
- Author(s): W. Frey
- Source: Electronics Letters, Volume 9, Issue 1, p. 12 –14
- DOI: 10.1049/el:19730009
- Type: Article
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A theoretical estimate of the power transport of a carrier wave in an nd-limited gallium-arsenide travelling-wave amplifier is presented, The nd being fixed, the thickness d can be optimised. The nd, being chosen to be 2 × 1011 cm-2, yields at 8.2 GHZ and 12 k V /cm bias field an optimum d of 5.3 μm, resulting in an r.f. power of 150 mW per centimetre of sample width.
Electrically alterable avalanche-injection memory
- Author(s): H.C. Card and A.G. Worrall
- Source: Electronics Letters, Volume 9, Issue 1, p. 14 –15
- DOI: 10.1049/el:19730010
- Type: Article
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In a 2-layer (SiO2–Si3 N4) dielectric structure, avalanche-injected electrons are collected by a floating gate. It is shown that this charge can be removed from the floating gate by conduction through the Si3N4 layer.
Influence of horn length on radiation pattern of oblique-flare-angle corrugated horn
- Author(s): P.J.B. Clarricoats and L.M. Seng
- Source: Electronics Letters, Volume 9, Issue 1, p. 15 –16
- DOI: 10.1049/el:19730011
- Type: Article
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The influence of horn length on the radiation pattern of an oblique-flare-angle corrugated horn is described. Two experiments with a 110° horn are reported. These show that a horn with three slots has a radiation pattern which is essentially the same as that of a horn with five slots. It is also demonstrated that the innermost slot has a dominant effect on the pattern.
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