Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 14, Issue 10, 11 May 1978
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Volume 14, Issue 10
11 May 1978
A low-cost long-term stochastic integrator
- Author(s): Ian H. Witten and Peter H.C. Madams
- Source: Electronics Letters, Volume 14, Issue 10, p. 293 –294
- DOI: 10.1049/el:19780199
- Type: Article
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The techniques of stochastic computing are applied to the design of a low-cost analogue-in analogue-out integrator, easily capable of time constants of several minutes. The expense of up-down counters is avoided by representing quantities as the proportion of bits which are ‘on’ in a randomly clocked shift register.
Selectively ion implanted Gunn-f.e.t. integrated circuits for pulse regenerator
- Author(s): Takashi Mizutani ; Satoru Ishida ; Katsuhiko Kurumada ; Masamichi Ohmori
- Source: Electronics Letters, Volume 14, Issue 10, p. 294 –295
- DOI: 10.1049/el:19780200
- Type: Article
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p.
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–295
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A planar GaAs integrated Gunn-effect device and f.e.t. connected in cascade have been fabricated using selective sulphur-ion implantation. High-speed pulse regeneration and pulse amplification have been realised under d.c. bias condition. Output voltage and voltage gain of the regenerated pulse of 1 ns width were 1.7 V and 18.6 dB, respectively.
Lateral phototransistor with low intensity light sensitivity
- Author(s): Yutaka Hayashi and Hirofumi Yoshihara
- Source: Electronics Letters, Volume 14, Issue 10, p. 295 –296
- DOI: 10.1049/el:19780201
- Type: Article
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–296
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A lateral phototransistor with stable sensitivity to a light input of the order of 10−3lx was fabricated by a single selective diffusion of boron in n on n+ epitaxial wafer. An extended emitter electrode on SiO2, over a whole emitter-base surface junction is employed to obtain stable low-level current gain.
Effect of nonrandom digital signals on p.c.m. frame synchronisation
- Author(s): R.J.S. Bates
- Source: Electronics Letters, Volume 14, Issue 10, p. 296 –298
- DOI: 10.1049/el:19780202
- Type: Article
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It is shown that for certain nonrandom p.c.m. digital signals a suitable choice of frame alignment word can result in an improved system realignment performance.
Partial correction of transmission errors in Walsh transform image without recourse to error correction coding
- Author(s): W.C. Wong and R. Steele
- Source: Electronics Letters, Volume 14, Issue 10, p. 298 –300
- DOI: 10.1049/el:19780203
- Type: Article
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A sequency difference detection and correction (s.d.d.c.) system is described which enables the partial correction of transmission errors in a Walsh-Hadamard transform image to be achieved without channel coding. Using a first-order two-dimensional random Gaussian Markov field as the image, the percentage mean-square error in the recovered signal is reduced with the aid of the s.d.d.c. system by two orders of magnitude for transmission error rates <3%.
‘Bootstrapping’ in Josephson tunnelling logic circuits
- Author(s): Hajime Yamada and Akira Ishida
- Source: Electronics Letters, Volume 14, Issue 10, p. 300 –302
- DOI: 10.1049/el:19780204
- Type: Article
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‘Bootstrapping’ in Josephson tunnelling logic circuits has been realised by providing series connection of multiple junctions and feedback of output current as an additional control current. Computer simulations have demonstrated that the speed-up of the circuits is successfully achieved. This configuration is effective for high-fanout logic circuits, memory peripheral circuits, etc.
Periodic response of nonlinear asymmetrical second-order oscillators
- Author(s): L. Vidaller
- Source: Electronics Letters, Volume 14, Issue 10, p. 302 –303
- DOI: 10.1049/el:19780205
- Type: Article
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The periodic time response and evolution over the phase plane of a free-running second-order nonlinear asymmetrical oscillator is analysed. The results of a digital-computer simulation, function of three parameters directly connected to the linearity, asymmetry and power of the system response, are also described.
Low-distortion downconvertor using varactor diodes
- Author(s): G. Ohm
- Source: Electronics Letters, Volume 14, Issue 10, p. 303 –305
- DOI: 10.1049/el:19780206
- Type: Article
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A balanced varactor downconvertor for a 6.8 GHz input signal is described. Measured intermodulation and conversion performance are given. Compared to Schottky-diode mixers this downconvertor has a considerably higher 3rd-order intercept point.
Contrast in reflection acoustic microscopy
- Author(s): H.K. Wickramasinghe
- Source: Electronics Letters, Volume 14, Issue 10, p. 305 –306
- DOI: 10.1049/el:19780207
- Type: Article
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Although the reflection acoustic microscope has long been used to study solid surfaces, the contrast that has been observed in images of complex i.c. devices were not well understood until fairly recently. Our recent article where we calculated the acoustic response of different materials suggested that the observed contrast was a strong function of the elastic properties of the surface being investigated. This letter is devoted to explaining the analysis used in our calculations.
Carrier removal profiles from oxygen implanted GaAs
- Author(s): S. Gecim ; B.J. Sealy ; K.G. Stephens
- Source: Electronics Letters, Volume 14, Issue 10, p. 306 –308
- DOI: 10.1049/el:19780208
- Type: Article
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Carrier removal profiles have been measured in annealed, oxygen implanted, n-type GaAs samples. The implants were performed at room temperature with an ion energy of 400 keV. A dose of 1015 O+/cm2 produced a resistivity of about 108 Ω/□ over a layer 0.6 μm thick, but no significant electrical compensation was observed from doses less than 1013 O+/cm2. However, doses of 1011 to 5×1012 O+/cm2 produced resistivities of 108 to 109 Ω/□ without subsequent annealing.
Direct determination of feedback shift register connections for delayed m-sequences generation
- Author(s): D.G. Maritsas and A. Bounas
- Source: Electronics Letters, Volume 14, Issue 10, p. 308 –310
- DOI: 10.1049/el:19780209
- Type: Article
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A new approach for determining delayed versions of m-sequences is presented. The stages of a feedback shift register which contribute to the generation of a given shift, can be specified by computing explicit expressions. Efficient algorithms can be constructed suitable for long sequences.
Lenses for wideband corrugated conical horns
- Author(s): R. Padman
- Source: Electronics Letters, Volume 14, Issue 10, p. 311 –312
- DOI: 10.1049/el:19780210
- Type: Article
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p.
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A dielectric lens, designed to be fed by a wide-angle corrugated conical horn, is described. The radiation pattern of the horn-lens combination is similar to that of a much longer conical horn while retaining wideband characteristics.
Algorithm for identification of multivariable discrete-time linear systems
- Author(s): Michele Brucoli ; Bruno Maione ; Francesco Torelli
- Source: Electronics Letters, Volume 14, Issue 10, p. 313 –315
- DOI: 10.1049/el:19780211
- Type: Article
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The method presented is for the z-transfer function matrix G(z) identification for constant-coefficient linear systems from samples of the impulse response matrix. By the proposed approach the roots of the minimal polynomial of G(z) and the corresponding residues are sequentially determined. The computational effort is here greatly reduced.
Depolarisation due to snow at 11.6 GHz
- Author(s): I.J. Dilworth and B.G. Evans
- Source: Electronics Letters, Volume 14, Issue 10, p. 315 –317
- DOI: 10.1049/el:19780212
- Type: Article
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Depolarisation events due to snow covering a period of three years on an 11.6 GHz, 18 km link employing linear and circular polarisation are presented. These are used to demonstrate the variability of wet and dry hydrometeor scattering. By deriving the equivalent differential phase-shift from the measurements it is possible to show the relative importance of differential phase and amplitude effects in depolarisation for the different hydrometeors.
Erratum: Approximations to hybrid mode slot line behaviour
- Author(s): C.M. Krowne
- Source: Electronics Letters, Volume 14, Issue 10, page: 317 –317
- DOI: 10.1049/el:19780213
- Type: Article
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Erratum: New acoustic-surface-wave zero-temperature cuts in Tl3VS4
- Author(s): J. Henaff and M. Feldmann
- Source: Electronics Letters, Volume 14, Issue 10, page: 318 –318
- DOI: 10.1049/el:19780214
- Type: Article
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Erratum: Frequency response of 2-dimensional digital filters
- Author(s): K.P. Prasad and P.S. Reddy
- Source: Electronics Letters, Volume 14, Issue 10, page: 318 –318
- DOI: 10.1049/el:19780215
- Type: Article
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Erratum: Optimisation of feed position and improved profile mapping of a reflector antenna from microwave holographic measurements
- Author(s): M.P. Godwin ; A.P. Anderson ; J.C. Bennett
- Source: Electronics Letters, Volume 14, Issue 10, page: 318 –318
- DOI: 10.1049/el:19780216
- Type: Article
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