Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 5, 7 March 1974
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Volume 10, Issue 5
7 March 1974
Improvement of semiconducting films for acoustoelectric amplification
- Author(s): Jeannine Henaff and M. le Contellec
- Source: Electronics Letters, Volume 10, Issue 5, p. 49 –50
- DOI: 10.1049/el:19740036
- Type: Article
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Experimental results for surface acoustoelectric amplification on a monolithic structure InSb/LiNbO3 are reported. Drift mobility, in a reproducible sequence of samples, has been found to be almost equal to the Hall mobility and reaches a value of up to 600 cm2/Vs.
Relation between pre-exponential factor and activation energy in dark conductivity of polyethylene
- Author(s): G. Sawa ; M. Ieda ; K. Kitagawa
- Source: Electronics Letters, Volume 10, Issue 5, p. 50 –51
- DOI: 10.1049/el:19740037
- Type: Article
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The conductivities of polyethylene obtained by different authors have been scattered over many orders of magnitude, and their activation energies have also varied from about 0.4 to 1.7 eV. To deduce a general rule for the data, using the available data so far published, the plot of the logarithm of the pre-exponential factor against the activation energy was made. As a result, the compensation rule was found to hold approximately for the conductivity of polyethylene at low electric fields.
Simple technique for displaying periodically jittered binary waveforms
- Author(s): H.W. del Monte
- Source: Electronics Letters, Volume 10, Issue 5, p. 52 –53
- DOI: 10.1049/el:19740038
- Type: Article
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A display system is described that electrically transforms a periodically jittered binary waveform to enable the modulating signal to be viewed directly on an oscilloscope, without demodulation.
Optical losses in soda-lime/silica-cladded fibres produced from composite rods
- Author(s): C.E.E. Stewart and P.W. Black
- Source: Electronics Letters, Volume 10, Issue 5, p. 53 –54
- DOI: 10.1049/el:19740039
- Type: Article
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A method for producing cladded preforms (composite rods) composed of high-purity soda-lime-silica glasses is described. Optical-attenuation measurements have been made on cladded fibres produced from such a preform over the wavelength region 600–1100 nm. Results indicate that the incremental loss in producing a fibre by this technique is very small, and is mainly due to scatter.
Gaussian-filter approximation
- Author(s): A.G.J. Holt and J. Attikiouzel
- Source: Electronics Letters, Volume 10, Issue 5, p. 54 –55
- DOI: 10.1049/el:19740040
- Type: Article
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A new approximation to the Gaussian-filter response is presented that uses a power-series-economisation technique with Cheby̅shev polynomials of the first kind. For high-order filters, the new method appears to yield a closer approximation to the Gaussian response than is given by the Taylor or Laguerre approximations.
Method to suppress limit-cycle oscillations in digital filter
- Author(s): K.M. Wong and R.A. King
- Source: Electronics Letters, Volume 10, Issue 5, p. 55 –57
- DOI: 10.1049/el:19740041
- Type: Article
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Extensive computer simulations of limit-cycle oscillations in a digital filter have been performed. The results of these simulations show that multirate digital filters with periodically varying coefficients can suppress limit-cycle oscillations. Some important observations are made from these results.
Widerange variable-pulse generator
- Author(s): F. Heutink
- Source: Electronics Letters, Volume 10, Issue 5, p. 57 –58
- DOI: 10.1049/el:19740042
- Type: Article
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A simple circuit is described that produces a pulse train with a repetition rate adjustable through about seven decades. In a breadboard version, the range was from 0.5 Hz to 5×106 Hz, with a pulse duration of 100 ns.
New adaptive-signal-processing concept
- Author(s): E. Stern and E. Stern
- Source: Electronics Letters, Volume 10, Issue 5, p. 58 –59
- DOI: 10.1049/el:19740043
- Type: Article
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A new device is proposed that combines a surface-wave memory with an acoustoelectric convolver to yield an adaptive real-time correlator and convolver. The principal difficulty in combining these devices is obtaining short intense electron bursts in a small gap between a piezoelectric and a semiconductor.
Alternative approach to design of wave digital filters
- Author(s): A.G. Constantinides
- Source: Electronics Letters, Volume 10, Issue 5, p. 59 –60
- DOI: 10.1049/el:19740044
- Type: Article
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The purpose of the letter is to outline an approach for designing wave digital filters that is based on a suitable interpretation of the scattering parameters of a network. The approach can be used for simulating analogue, doubly terminated, lossless ladder filters.
Erratum: New cholesteric liquid crystals for displays
- Author(s): G.W. Gary ; K.J. Harrison ; J.A. Nash ; E.P. Raynes
- Source: Electronics Letters, Volume 10, Issue 5, page: 60 –60
- DOI: 10.1049/el:19740045
- Type: Article
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Erratum: Bending losses of multimode optical fibres
- Author(s): A.W. Snyder and D.J. Mitchell
- Source: Electronics Letters, Volume 10, Issue 5, page: 60 –60
- DOI: 10.1049/el:19740046
- Type: Article
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