Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 13, 27 June 1974
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Volume 10, Issue 13
27 June 1974
Comb-type slow-wave structure for travelling-wave masers
- Author(s): E.L. Kollberg
- Source: Electronics Letters, Volume 10, Issue 13, p. 249 –250
- DOI: 10.1049/el:19740197
- Type: Article
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p.
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–250
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A modified comb-type slow-wave structure (s.w.s.) for travelling-wave masers is discussed. The dispersion relation is expressed in terms of the s.w.s. geometry and the admittances of coupled striplines. The slowing factor and the volume-filling factor, important parameters for travelling-wave masers, are discussed.
Low-frequency noise in incandescent tungsten filaments
- Author(s): E.J.P. May and H.M. Aniagyei
- Source: Electronics Letters, Volume 10, Issue 13, p. 250 –251
- DOI: 10.1049/el:19740198
- Type: Article
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It is shown that low-frequency noise in an incandescent filament heated by direct current has two origins. One component of this noise is shown to be due to the high temperature of the filament and other due to the direct current. This explains the discrepancy between the measured noise levels and those predicted theoretically.
Effects of degradation-induced absorption in GaAs-d.h.s. laser diodes
- Author(s): D. Schicketanz ; J. Wittmann ; G. Zeidler
- Source: Electronics Letters, Volume 10, Issue 13, p. 252 –253
- DOI: 10.1049/el:19740199
- Type: Article
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–253
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The absorbing lines observed in degraded GaAs-d.h.s. laser diodes cause increased local heating and higher threshold values. Since absorption is partly saturable by strong optical signals, the transient behaviour resembles that of passive Q-switched lasers.
Algorithm for determining the power of the companion matrix for multivariable systems
- Author(s): B. Maione and F. Torelli
- Source: Electronics Letters, Volume 10, Issue 13, p. 253 –254
- DOI: 10.1049/el:19740200
- Type: Article
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A method is developed for determining the powers of companion system matrices of multivariable linear time-invariant dynamical systems. The iterative scheme, which can easily be programmed on a digital computer, is verified by an example.
Digital hardware for approximating to the amplitude of quadrature pairs
- Author(s): F. Braun and H. Blaser
- Source: Electronics Letters, Volume 10, Issue 13, p. 255 –256
- DOI: 10.1049/el:19740201
- Type: Article
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A method for calculating the square root of the sum of two squared variables by a piecewise linear approximation is presented. Simplicity is obtained by restricting the number of 1s in the hard-wired coefficients and by using well suited intervals for the linear approximation. To obtain a small minimax error, a constant gain is introduced and optimised along with the coefficients.
Collisional series resistance in electron beams
- Author(s): A.H.W. Beck
- Source: Electronics Letters, Volume 10, Issue 13, p. 256 –257
- DOI: 10.1049/el:19740202
- Type: Article
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The standard reference books on electron optics, Glaser (1952), Sturrock (1955) and Grivet (1972), do not consider the possibility that an electron beam can exhibit a series resistance, even at zero frequency. The letter demonstrates that a series-resistance term must exist. Numerical estimates of the series resistance are given, from which it is shown that the resistance is not negligible for the high-density electron beams used in modern millimetre-wave oscillators and amplifiers. The consequences for noise theory and for the theory of crossed-field devices, in which the beam resistivity is increased by a large factor, are briefly discussed.
Digital single-sideband modulators
- Author(s): P.M. Terrell and P.J.W. Rayner
- Source: Electronics Letters, Volume 10, Issue 13, p. 257 –258
- DOI: 10.1049/el:19740203
- Type: Article
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A new derivation of Darlington's digital s.s.b./f.d.m. modulator1 implementation is presented, giving additional structural insight.
Comment on ‘Determination of system frequency response direct from crosscorrelation functions of sinusoidal signals’
- Author(s): W.F. Lovering
- Source: Electronics Letters, Volume 10, Issue 13, page: 259 –259
- DOI: 10.1049/el:19740204
- Type: Article
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Simple empirical relationship between mobility and carrier concentration
- Author(s): C. Hilsum
- Source: Electronics Letters, Volume 10, Issue 13, p. 259 –260
- DOI: 10.1049/el:19740205
- Type: Article
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259
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Analysis of experimental data shows that a simple relationship connects the electron mobility with the donor concentration ND. At room temperature, the mobility is inversely proportional to 1+√(ND/1017) for a number of important semiconductors.
Perturbation methods in numerical s plane analysis
- Author(s): R.K. Jarrott
- Source: Electronics Letters, Volume 10, Issue 13, p. 260 –261
- DOI: 10.1049/el:19740206
- Type: Article
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The application of Kron's link-at-a-time formula to s plane analysis methods is investigated to facilitate optimisation and variational studies of linear lumped networks characterised in the s domain.
New active-gyrator circuit
- Author(s): H.J. Orchard and A.N. Willson
- Source: Electronics Letters, Volume 10, Issue 13, p. 261 –262
- DOI: 10.1049/el:19740207
- Type: Article
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Ideal passive gyrators can be made using two operational amplifiers, and it has been proved that they cannot be made with only one amplifier. However, this latter proof led to the discovery that an ideal active gyrator can be made with only one amplifier. A circuit for doing this is presented here, and its behaviour when used in an inductance-simulating mode is analysed.
Gradients of a performance index arising from network optimisation in the frequency domain
- Author(s): T. Matsumoto
- Source: Electronics Letters, Volume 10, Issue 13, page: 263 –263
- DOI: 10.1049/el:19740208
- Type: Article
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A method is given that calculates the gradients of a performance index arising from computer-aided network design in the frequency domain.
Reduction of antenna dimensions by dielectric loading
- Author(s): J.R. James ; A.J. Schuler ; R.F. Binham
- Source: Electronics Letters, Volume 10, Issue 13, p. 263 –265
- DOI: 10.1049/el:19740209
- Type: Article
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Measurements are presented to show that Yagi and resonant-slot antennas can be reduced in size if loaded with dielectric material. The effect on bandwidth, radiation resistance and the radiation patterns is discussed, and the loss in the material is recognised as the crucial parameter constraining the usefulness of this loading technique.
Canonical lowpass prototype network for symmetric coupled-resonator bandpass filters
- Author(s): H. Clark Bell
- Source: Electronics Letters, Volume 10, Issue 13, p. 265 –266
- DOI: 10.1049/el:19740210
- Type: Article
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A lowpass prototype network that represents a canonical realisation for symmetric coupled-resonator bandpass filters is presented. A synthesis procedure for the prototype is outlined.
Low-frequency noise in GaAs Schottky-gate f.e.t.s.
- Author(s): J. Graffeuil and J. Caiminade
- Source: Electronics Letters, Volume 10, Issue 13, p. 266 –268
- DOI: 10.1049/el:19740211
- Type: Article
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Measurements of the low-frequency noise in GaAs Schotty-gate f.e.t. channels have been performed from 10 Hz to 0.5 MHz between −120 and +21 °C. Diffusion and recombination noise sources appear to be predominant at low temperatures for low-power-level conditions.Nous avons entrepris la mesure du bruit basse fréquence prenant naissance dans le canal des f.e.t. à l'arséniure de gallium pour des fréquences allant de 10 Hz à 0. 5 MHz et une température comprise entre −120 et +21 °C. Nous avons mis en évidence que pour de faibles puissances dissipées les sources de bruit principales à basse température ont pour origine des phénomènes de diffusion et de génération recombinaison.
Improved algorithm for state-space synthesis
- Author(s): H. Singh and M. Lal
- Source: Electronics Letters, Volume 10, Issue 13, page: 268 –268
- DOI: 10.1049/el:19740212
- Type: Article
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Given a positive real Z(s) having a realisation [A, B, C] an improved algorithm for determining a realisation [A, B, L] of W(s) required in the well known state-space-synthesis procedures is proposed.
Erratum: Optimum packet size in a packet-switched data network
- Author(s): J.C. Majithia and R. Bhar
- Source: Electronics Letters, Volume 10, Issue 13, page: 268 –268
- DOI: 10.1049/el:19740213
- Type: Article
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