Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 16, 4 August 1977
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Volume 13, Issue 16
4 August 1977
Microwave modulation by amorphous-semiconductor switches
- Author(s): D.N. Bose and B.J. Jani
- Source: Electronics Letters, Volume 13, Issue 16, p. 451 –452
- DOI: 10.1049/el:19770325
- Type: Article
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Microwave modulation has been achieved by using thin-film amorphous-semiconductor switches made of ternary chalcogenides. X-band microwaves were modulated by a threshold switch at frequencies varying from 100 Hz to 1 MHz, with modulation efficiencies comparable to siliconp–i–n diodes. The insertion loss was 0.5 to 0.6 dB and the isolation was 18 dB at 100 mA operating current. Possible applications this method are discussed.
Optical transmission experiment at 1.12 Gbit/s using a graded-index fibre with a length of 1.652 km
- Author(s): C. Baack ; G. Elze ; G. Walf ; G. Gliemeroth ; D. Krause ; N. Neuroth
- Source: Electronics Letters, Volume 13, Issue 16, p. 452 –453
- DOI: 10.1049/el:19770326
- Type: Article
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The letter describes the transmission of an optical p.c.m. signal with a pulse rate of 1.12 Gbit/s by using a graded-index fibre with a length of 1.652 km and a c.w. semiconductor laser as transmitter. We studied the dependence of the dispersion on the laser wavelength and on the coupling arrangement between laser and fibre. For estimating the material dispersion, we analysed the dynamic spectral behaviour of the laser.
Fast numerical algorithm for the recompression of dispersed time signals
- Author(s): A.K. Booer ; J. Chambers ; I.M. Mason
- Source: Electronics Letters, Volume 13, Issue 16, p. 453 –455
- DOI: 10.1049/el:19770327
- Type: Article
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A fast numerical algorithm is presented for recompressing signals propagated over different path lengths in a dispersive duct. It is shown that an appropriate distortion of a signal spectrum recompresses dispersed arrivals regardless of their arrival times. The method is applied to the preprocessing of seismic data acquired in an underground pulse-echo location system for imaging faults in coal seams.
Slant-path attenuation through rainstorms
- Author(s): J.L. Eaton
- Source: Electronics Letters, Volume 13, Issue 16, p. 455 –456
- DOI: 10.1049/el:19770328
- Type: Article
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Using a model of intense convective rain cells based on observations in the UK, calculations of attenuation on slant satellite broadcasting paths may be made. The results, are considered as useful in planning studies. Examples are given for paths passing directly through the storm centre and to one side of it.
Novel c.c.d. signal integrator
- Author(s): C.P. Traynar ; P.C.T. Roberts ; G.G. Bloodworth ; R.G. Taylor
- Source: Electronics Letters, Volume 13, Issue 16, p. 456 –458
- DOI: 10.1049/el:19770329
- Type: Article
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The implementation of a c.c.d. signal integrator to improve the signal/clutter ratio of radar returns is described. A parallel-transfer scheme is employed, in which the effects of transfer inefficiency on performance are minimised. Preliminary investigations with a test device are reported.
Efficient hard-wired digital fast-Fourier-transform processor
- Author(s): R.J. Risk
- Source: Electronics Letters, Volume 13, Issue 16, p. 458 –459
- DOI: 10.1049/el:19770330
- Type: Article
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A hard-wired dedicated fast-Fourier transform processor is described, which has high speed, low power consumption, small size and low cost. The technique is applicable to any size of transform, and could readily be adapted to employ improved components or a more efficient control algorithm.
Deep-level changes associated with the degradation of GaAs0.6 P0.4 l.e.d.s
- Author(s): C. López ; A. García ; E. Muñoz
- Source: Electronics Letters, Volume 13, Issue 16, p. 460 –461
- DOI: 10.1049/el:19770331
- Type: Article
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The generation of deep levels in GaAS0.6 P0.4 electroluminescent diodes during forward-bias degradation has been studied by transient capacitance techniques. By comparison with the native trapping centres, it is concluded that only hole trap concentration increases during aging. This result is correlated through current/voltage, light/current, reverse-recovery-time and infrared-radiation measurements.
Coloration and its reduction in phosphorus-doped low-loss optical fibres
- Author(s): R. Yamauchi ; T. Kobayashi ; T. Arai ; K. Inada
- Source: Electronics Letters, Volume 13, Issue 16, p. 461 –462
- DOI: 10.1049/el:19770332
- Type: Article
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Coloration and its reduction in phosphorus-doped low-loss optical fibres have been investigated. The absorption loss at 0.53μm is as high as 60 to 100 dB/km when measured immediately after the drawing process. The coloration, however, can be almost completely reduced by annealing at 100°C for 48 h.
Transmission of radio signals in deep-level gold mines indirectly via power cables
- Author(s): B.A. Austin and I. Kerdic
- Source: Electronics Letters, Volume 13, Issue 16, p. 462 –463
- DOI: 10.1049/el:19770333
- Type: Article
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A method of coupling into the bifilar mode on a multiconductor line is discussed. No special-purpose mode convertors are employed, and the technique has special significance for fixed-station applications such as telemetry systems used underground in mines.
Necessary criteria for the diagnosis of panel misalignments in large reflector antennas by microwave metrology
- Author(s): J.C. Bennett and M.P. Godwin
- Source: Electronics Letters, Volume 13, Issue 16, p. 463 –465
- DOI: 10.1049/el:19770334
- Type: Article
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Conditions for diagnosing panel misalignments in large reflector antennas by using microwave metrology are given. A computer simulation shows the essential requirement of data sufficiency and the ambiguities arising from under-recording.
Equivalent circuit of coaxial-to-microstrip connector over the 8–12 GHz range
- Author(s): S.O. Ajose and N.A. Mathews
- Source: Electronics Letters, Volume 13, Issue 16, p. 465 –466
- DOI: 10.1049/el:19770335
- Type: Article
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An equivalent circuit of OSM–244–4 ASF coaxial-to-microstrip connector is presented. The dielectric-filled coaxial line region of the connector is represented by a 50 ω air line and the coaxial-to-microstrip transition by a T-network. An optimisation procedure is employed to obtain optimum component values of the equivalent circuit from the measured input reflection coefficient into the connector fixed on an open-circuited microstrip line.
Adaptively designed test logic for digital circuits
- Author(s): I. Aleksander and Z. Al-Bandar
- Source: Electronics Letters, Volume 13, Issue 16, p. 466 –467
- DOI: 10.1049/el:19770336
- Type: Article
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–467
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Adaptive n-tuple pattern-recognition techniques in their hardware embodiment may be used to design test circuits for logic systems which indicate the presence of a fault. The principles of this concept are explained and early results obtained with realistically scaled circuits are presented.
Instantaneous change in current gain produced by burst noise in a planar transistor
- Author(s): K.F. Knott
- Source: Electronics Letters, Volume 13, Issue 16, p. 467 –468
- DOI: 10.1049/el:19770337
- Type: Article
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–468
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Investigation of the intermittent burst noise in planar transistors has revealed changes in a.c. current gain hra, occurring during burst periods. To explain this it is postulated that tho collector-current/base-current characteristic changes during the burst period.
Low-frequency multiplication noise in reference diodes for small multiplication factors
- Author(s): M.M. Jevtić ; D.A. Tjapkin ; D.A. Tjapkin
- Source: Electronics Letters, Volume 13, Issue 16, p. 468 –470
- DOI: 10.1049/el:19770338
- Type: Article
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–470
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An analysis of the current dependence of multiplication noise for small multiplication factors (M < 103) is given, including the generation component of the reverse current and the position dependence of the ionisation coefficient of electrons (and holes) in the diode depletion region. Results are given for abrupt Si p–n junctions.
Input correlation with the a.s.w. storage correlator
- Author(s): P. Borden and G.S. Kino
- Source: Electronics Letters, Volume 13, Issue 16, p. 470 –471
- DOI: 10.1049/el:19770339
- Type: Article
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p.
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–471
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By correlating during read-in, we correlate signals of much greater length than could be stored within the device, thereby obtaining a large improvement in t.b. product.
Coaxial-cable equaliser employing active distributed RC networks
- Author(s): W. Maggi ; G. Orlandi ; M. Salerno
- Source: Electronics Letters, Volume 13, Issue 16, p. 471 –472
- DOI: 10.1049/el:19770340
- Type: Article
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471
–472
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We propose a coaxial-cable equalising structure based on the use of active networks containing RC distributed lines. A numerical example proves the validity of the approach.
Schottky mixer diodes made by a new method
- Author(s): J. Lacombe ; J.P. Duchemin ; M. Bonnet ; D. Huyghe
- Source: Electronics Letters, Volume 13, Issue 16, p. 472 –473
- DOI: 10.1049/el:19770341
- Type: Article
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–473
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In the letter, preliminary results are reported on GaAs Schottky mixer diodes on material grown by means of a new method based on organometallic cracking at low pressures.
Synthesis of some partially symmetric Boolean functions by ternary algebra
- Author(s): M. Davio and J.-P. Deschamps
- Source: Electronics Letters, Volume 13, Issue 16, p. 473 –474
- DOI: 10.1049/el:19770342
- Type: Article
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p.
473
–474
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A Boolean function of 2n arguments f(x,y) endowed with the partial symmetries x1∼y1 may be described by a binary function ϕ(w) of n ternary variables w1 = x1 + y1. The resulting synthesis yields a 4-level design of a circuit computing f(x, y). The method is applied to the design of a b.c.d. adder-convertor.
Regenerative transistor power switch
- Author(s): D.G. Van Der Merwe and W.J. Louw
- Source: Electronics Letters, Volume 13, Issue 16, p. 474 –475
- DOI: 10.1049/el:19770343
- Type: Article
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A regenerative transistor power switch, capable of handling 30 A, is described. The switch behaves like a gate turn-off thyristor, and can easily be fabricated in hybrid form.
Model for charge propagation in a resistive-gate m.o.s. structure
- Author(s): R.M. Barsan
- Source: Electronics Letters, Volume 13, Issue 16, p. 475 –477
- DOI: 10.1049/el:19770344
- Type: Article
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A simple model is developed for the investigation of the charge-transport process in an m.o.s. transmission line. Closed-form solutions that compare well with numerical calculations are derived for the operational parameters of interest, by separating the propagation of charge into a transport step and a transfer step.
Stabilising circuit for a tuned-circuit magnetic levitator
- Author(s): M.R. Button and P.N. Murgatroyd
- Source: Electronics Letters, Volume 13, Issue 16, p. 477 –478
- DOI: 10.1049/el:19770345
- Type: Article
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A circuit is described for achieving dynamic stability in a low-powered tuned-circuit magnetic levitator. A field-effect transistor is used as a controllable resistance to give velocity-feedback damping. The circuit uses standard components only, and the system is particularly suitable for vacuum applications.
Effect of surface distortions on the crosspolarisation performance of paraboloidal reflectors
- Author(s): B. MACA. Thomas and P.T. Rayner
- Source: Electronics Letters, Volume 13, Issue 16, p. 478 –480
- DOI: 10.1049/el:19770346
- Type: Article
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The effects on the crosspolarisation and the radiation patterns of circular paraboloidal reflectors produced by (a) reflector distortions which are periodic in the circumferential direction and (b) a lateral offset of the feed have been evaluated for a wide range of reflector and feed parameters. It is shown that the use of a balanced hybrid-mode feed minimises crosspolarisation introduced by reflector distortions.
Nonlinear theory of long-range-interaction resonant generators
- Author(s): A.A. Shmat'Ko ; O.A. Tretiykov ; D.M. Vavriv
- Source: Electronics Letters, Volume 13, Issue 16, p. 480 –481
- DOI: 10.1049/el:19770347
- Type: Article
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A nonlinear self-consistent theory has been developed for resonant electronic generators of long-range interaction. The theory has been under development for devices whose electrodynamic system has a high Q-factor and a sufficiently rarefied spectrum. In accordance with the initial physical situation, the mathematical model under consideration has been obtained in the form of a system of differential equations, and an algorithm for its numerical solution has been proposed. The maximum amplitude of the generated oscillations in an open cavity with a Gaussian distribution of the field has been calculated analytically.
Wideband equalisation and signal averaging applied to the pulse echo return loss testing of telecommunication coaxial cables
- Author(s): P. Cochrane and J.K. Perkins
- Source: Electronics Letters, Volume 13, Issue 16, p. 481 –482
- DOI: 10.1049/el:19770348
- Type: Article
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A pulse echo return loss testing technique is described that has been developed as a maintenance aid for high-bit-rate digital transmission systems. Wideband equalisation and signal averaging have been used to achieve the high positional resolution coupled with the high sensitivity necessary to allow echo sources to be detected at any point in a regenerator section. A brief description of the equipment is given together with an example of the results achieved under laboratory conditions.
Radiation-induced degradation of ohmic contacts
- Author(s): R. Blundell ; D.V. Morgan ; M.J. Howes
- Source: Electronics Letters, Volume 13, Issue 16, p. 483 –484
- DOI: 10.1049/el:19770349
- Type: Article
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Ohmic contacts can be severely degraded by the introduction of small amounts of radiation damage at the metal-semiconductor interface. This can lead to failure of GaAs transferred-electron devices; a safe limit for proton bombardment of ohmic contacts is proposed.
Small-area, high-radiance c.w. InGaAsP l.e.d.s emitting at 1.2 to 1.3 μm
- Author(s): A.G. Dentai ; T.P. Lee ; C.A. Burrus ; E. Buehler
- Source: Electronics Letters, Volume 13, Issue 16, p. 484 –485
- DOI: 10.1049/el:19770350
- Type: Article
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Double-heterostructure InP/lnGaAsP/lnP high-radiance l.e.d.s have been fabricated by liquid-phase epitaxy on the <IIIB> face of commercially available InP substrates. The best small-area l.e.d.s had a useful external power efficiency of 1.5% and a 900 Å-wide emission spectrum centred at 1.23 μm. emitting ∼3 mW into the air at 100 mA and 2 V; essentially similar results were obtained with devices operating al 1.30 μm.
Synthesis of cutpoint cellular arrays with exclusive-OR collector row
- Author(s): G. Papakonstantinou
- Source: Electronics Letters, Volume 13, Issue 16, p. 486 –487
- DOI: 10.1049/el:19770351
- Type: Article
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A method is given for obtaining minimal realisation of cutpoint cellular arrays, with exclusive-OR collector row, for a given arbitrary switching function with less than six variables.
Submicrometre Al0.5Ga0.5As heterojunction gate GaAs f.e.t.
- Author(s): H. Morkoc ; S.G. Bandy ; G.A. Antypas ; R. Sankaran
- Source: Electronics Letters, Volume 13, Issue 16, p. 487 –488
- DOI: 10.1049/el:19770352
- Type: Article
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Preliminary results on the d. c. and microwave performance of Al0.5Ga0.5 As gate heterojunction GaAs field-effect transistors (h.j.f.e.t.) with submicrometre gate lengths are reported. The structure is of a 3-layer sandwich formed by an n-type 1017 cm3 Sn-doped active layer on a Cr-doped substrate, a p-type 1015 cm−3 Ge-doped Al0.5Ga0.5As gate layer and a p+-type 5 × 1013 cm-3 Ge-doped GaAs ‘cap' layer on the top of the gate. Selective etching of the p+ GaAs and p-Al0.5Ga0.5As provides the necessary overhang for self-aligned device fabrication. Experimental devices with sub-micrometre gate lengths and with a gate periphery of 300 μm have exhibited a d. c. transconductance of 20 to 30 mS and an m.a.g. of 9.5 dB at 8 GHz. To our knowledge, this is the first time a submicrometre gate h.j.f.e.t. has been fabricated to give amplification of power at X-band.
Correlation parameters of random binary sequences
- Author(s): H.F.A. Roefs and M.B. Pursley
- Source: Electronics Letters, Volume 13, Issue 16, p. 488 –489
- DOI: 10.1049/el:19770353
- Type: Article
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The asymptotic properties of aperiodic and related correlation parameters are investigated for random binary sequences. Performance parameters for synchronous and asynchronous multiple-access systems are comapared.
Phase of crosspolarised signals on microwave satellite links
- Author(s): N.J. McEwan
- Source: Electronics Letters, Volume 13, Issue 16, p. 489 –491
- DOI: 10.1049/el:19770354
- Type: Article
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For a linearly polarised satellite link in the 4–30 GHz range, ‘anomalously high’ crosspolar signals caused by differential phase shift should always exhibit a phase of nearly ±90 relative to the wanted polarisation. This principle might permit an adaptive cancellation system using only one variable parameter (amplitude); it does not necessarily apply for circular polarisation, a possible advantage of linear over circular polarisation on practical links.
Erratum: Diffraction-optimised shaped-beam reflector antennas
- Author(s): R.D. Elliot and G.T. Poulton
- Source: Electronics Letters, Volume 13, Issue 16, page: 491 –491
- DOI: 10.1049/el:19770355
- Type: Article
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Erratum: Analogue c.c.d. correlator using monolithic m.o.s.t. multipliers
- Author(s): J. Mavor ; J.W. Arthur ; P.B. Denyer
- Source: Electronics Letters, Volume 13, Issue 16, page: 491 –491
- DOI: 10.1049/el:19770356
- Type: Article
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Erratum: Matrix formulation of corrugated feeds by using impedance boundary conditions
- Author(s): L. Shafai and J.E. Hansen
- Source: Electronics Letters, Volume 13, Issue 16, page: 491 –491
- DOI: 10.1049/el:19770357
- Type: Article
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Erratum: Estimating the correlation coefficient of highly correlated clutter
- Author(s): W.J. Szajnowski
- Source: Electronics Letters, Volume 13, Issue 16, page: 491 –491
- DOI: 10.1049/el:19770358
- Type: Article
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Erratum: Unified active structure for an arbitrary 2-port network realisation
- Author(s): C. Andrzej ; F. Stephan ; O. Stanislaw
- Source: Electronics Letters, Volume 13, Issue 16, page: 491 –491
- DOI: 10.1049/el:19770359
- Type: Article
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Comment on ‘Design of stable 2-dimensional discrete recursive filters’ [and reply]
- Author(s): K.P. Prasad ; P.S. Reddy ; P.A. Ramamoorthy ; L.T. Bruton
- Source: Electronics Letters, Volume 13, Issue 16, p. 491 –492
- DOI: 10.1049/el:19770360
- Type: Article
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