Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 11, Issue 1, 9 January 1975
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Volume 11, Issue 1
9 January 1975
n-user asynchronous arbiter
- Author(s): P. Corsini
- Source: Electronics Letters, Volume 11, Issue 1, p. 1 –2
- DOI: 10.1049/el:19750001
- Type: Article
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A very simple asynchronous arbiter is given for n concurrent asynchronous processors interconnected in a speed-independent way. The arbiter, based on the 2-user perfect asynchronous arbiter of Patil, is structured in a modular way. At every processor, a module is given. The arbiter takes shape by properly interconnecting the modules.
Optical coupling between thin films and circular fibres
- Author(s): P.J.R. Laybourn ; C.A. Millar ; G. Stewart ; C.D.W. Wilkinson
- Source: Electronics Letters, Volume 11, Issue 1, p. 2 –3
- DOI: 10.1049/el:19750002
- Type: Article
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Techniques are proposed for launching light into circular glass-fibre waveguides from prism couplers and thin-film optical waveguides. To make the evanescent field of core modes available, the fibre cladding is etched away, or its refractive index modified by ion exchange.
Some novel exclusive-OR/NOR circuits
- Author(s): C.R. Edwards
- Source: Electronics Letters, Volume 11, Issue 1, p. 3 –4
- DOI: 10.1049/el:19750003
- Type: Article
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Some novel exclusive-OR/NOR-gate circuits are described that employ very few circuit components. They are also easily made in integrated-circuit form.
Digital xy position indicator using Walsh functions
- Author(s): J. Gordon
- Source: Electronics Letters, Volume 11, Issue 1, p. 5 –6
- DOI: 10.1049/el:19750004
- Type: Article
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Elementary properties of Walsh functions are used to devise a digital system capable of providing the xy co-ordinates of a probe on a plane surface, to an accuracy of 1 part in 2m, using only 2m circuits.
Coaxial junction with 3-ports as a variable 2-port S parameter standard at microwave frequencies
- Author(s): D. Woods
- Source: Electronics Letters, Volume 11, Issue 1, p. 6 –8
- DOI: 10.1049/el:19750005
- Type: Article
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A simple method is described for generating standard values of S21 over a range of approximately 10 dB by a 3-port coaxial junction and an air–dielectric line of variable length at frequencies where λ/2 lines can be realised.
Pulse broadening in multimode graded-index fibres
- Author(s): J.A. Arnaud
- Source: Electronics Letters, Volume 11, Issue 1, p. 8 –9
- DOI: 10.1049/el:19750006
- Type: Article
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A closed-form expression is obtained for pulse broadening in graded-index fibres with k2(r)=1−r2+ε2r4+…+εnr2n. Pulse broadening for k2(r)=1−r2+0.615r4+70r6 and r<0.1 is 12 times smaller than for square-law fibres if material dispersion is neglected.
Multipurpose simulation network with a single amplifier
- Author(s): C.E. Schmidt and Man Shek lee
- Source: Electronics Letters, Volume 11, Issue 1, p. 9 –10
- DOI: 10.1049/el:19750007
- Type: Article
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A network consisting of an operational amplifier, one or two capacitors and several resistors can be connected to form several f.d.n.r. circuits or an inductance-simulation circuit.
Novel approach to the production of band branching filters for microwave frequencies
- Author(s): D.E.N. Davies ; A.Y. Niazi ; D. Lamensdorf
- Source: Electronics Letters, Volume 11, Issue 1, p. 10 –11
- DOI: 10.1049/el:19750008
- Type: Article
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A new type of microwave branching filter is proposed, using a curved slotted-waveguide array to focus different frequencies into different receiving apertures in a near-field focal plane. An example of a theoretical response for a 7-channel filter is given.
Calculation of the far-field halfpower width and mirror reflection coefficients of double-heterostructure lasers
- Author(s): P.J. De Waard
- Source: Electronics Letters, Volume 11, Issue 1, p. 11 –12
- DOI: 10.1049/el:19750009
- Type: Article
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A comparison is made between theoretical and experimental values of the beamwidth of a d.h. injection laser. The importance of the obliquity factor is pointed out. The good agreement between theory and experiment permits the determination of material properties from laser-diode measurements. Further, mirror reflection coefficients for lasers immersed in different liquids are calculated. Marked differences in the values of the Fresnel reflection coefficients, for normal incidence, are found.
Transit modes of InP transferred-electron devices
- Author(s): D. Jones and H.D. Rees
- Source: Electronics Letters, Volume 11, Issue 1, p. 13 –14
- DOI: 10.1049/el:19750010
- Type: Article
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The characteristics of accumulation transit oscillations in InP n+-n-n+ transferred-electron oscillators and the dependence of device efficiency on the injection properties of the cathode contact have been analysed by computer simulation.
Translinear circuits: a proposed classification
- Author(s): B. Gilbert
- Source: Electronics Letters, Volume 11, Issue 1, p. 14 –16
- DOI: 10.1049/el:19750011
- Type: Article
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An important and expanding branch of analogue circuits is the ‘translinear’ group. Their primary function arises from the exploitation of the precise proportionality of transconductance to collector current in bipolar transistors so as to result in fundamentally exact, temperature-insensitive behaviour. The basic translinear principle is derived and several examples given.
Simplified method for establishing determinacy in a directed-graph control structure
- Author(s): F.G. Heath
- Source: Electronics Letters, Volume 11, Issue 1, p. 16 –17
- DOI: 10.1049/el:19750012
- Type: Article
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The only analytical method so far proposed for establishing determinacy in a model for parallel computation is due to Karp and Miller. It involves growing a tree of every machine state, which is typically very large and needs much computation. The letter describes a very much simpler method suitable for nonpipelined hardware.
Suboptimal method of feature selection and ordering for multiclass problems
- Author(s): P.J. Horne and E.H. Mamdani
- Source: Electronics Letters, Volume 11, Issue 1, p. 17 –18
- DOI: 10.1049/el:19750013
- Type: Article
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Feature extraction remains a problem in pattern recognition, and the letter describes a method of weighting features so that the significant parameters of the input patterns are emphasised. This enables dimensionality reduction to take place without loss of information necessary to distinguish between classes.
Transient response of antennas with nonlinear loads
- Author(s): F.M. Tesche and T.K. Liu
- Source: Electronics Letters, Volume 11, Issue 1, p. 18 –19
- DOI: 10.1049/el:19750014
- Type: Article
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A method for determining the current flowing through a nonlinear load on an antenna is discussed. This method uses the results of a frequency-domain analysis for the linear portion of the problem. A time-marching procedure then is devised to take account of the effects of the nonlinear element. Sample calculations are illustrated for a step-excited antenna having a nonlinear resistive load.
Linear quadratic optimal estimation and control with receding horizon
- Author(s): Y.A. Thomas
- Source: Electronics Letters, Volume 11, Issue 1, p. 19 –21
- DOI: 10.1049/el:19750015
- Type: Article
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Implementation of linear quadratic optimal regulators and Kalman estimators is not straightforward where industrial process control is concerned. This is mainly due to the requirement that many parameters (Q and R matrices, spectral-density matrices) having no direct physical meaning must be chosen a priori. The letter contains simplified optimal algorithms that lead to stationary gains, given by explicit expressions.
Subnanosecond-pulse generator with variable pulsewidth using avalanche transistors
- Author(s): H.-M. Rein and M. Zahn
- Source: Electronics Letters, Volume 11, Issue 1, p. 21 –23
- DOI: 10.1049/el:19750016
- Type: Article
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The letter describes a pulse generator with epitaxial silicon planar transistors working in the avalanche-breakdown mode. The risetime is 150 ps and the fall time 200 ps. The pulse-width can be varied continuously between 0.3 and 120 ns, without changing the maximum amplitude of about 15 V. Simple rules for the exact design of the circuitry are given.
Influence of active-layer width on the performance of homojunction and single-heterojunction GaAs light-emitting diodes
- Author(s): W. Harth ; J. Heinen ; W. Huber
- Source: Electronics Letters, Volume 11, Issue 1, p. 23 –24
- DOI: 10.1049/el:19750017
- Type: Article
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For epitaxial GaAs homojunction and single-heterojunction (s.h.) l.e.d.s, light power output and risetime as a function of active-layer width were investigated. Narrow-base homojunction diodes can be markedly faster than s.h. diodes, the rise time of which is limited by the electron lifetime. However, for equal width of the active layer and equal injection level, the light power output of s.h. diodes is superior, compared with that of homojunction diodes.
Optical-fibre connector
- Author(s): J.F. Dalgleish and H.H. Lukas
- Source: Electronics Letters, Volume 11, Issue 1, p. 24 –26
- DOI: 10.1049/el:19750018
- Type: Article
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A connector for joining plastics-coated, multimode fibres has low insertion loss and good environmental stability. The connector is suitable for field installation by a portable installation fixture and using simple tools.
High-dynamic-range bulk-elastic-wave correlator
- Author(s): E. Bridoux ; J.M. Rouvaen ; F. Haine ; R. Torguet
- Source: Electronics Letters, Volume 11, Issue 1, p. 26 –27
- DOI: 10.1049/el:19750019
- Type: Article
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The nonlinear interaction between two bulk elastic waves of different polarisations is used to generate a propagating elastic wave carrying a correlation of the two input waveforms. Measurements show the high efficiency and dynamic range of the device and a variable-delay capability is demonstrated.
Disturbance-rejection characteristics of linear discrete-time systems incorporating integral feedback
- Author(s): B. Porter and A. Bradshaw
- Source: Electronics Letters, Volume 11, Issue 1, p. 27 –28
- DOI: 10.1049/el:19750020
- Type: Article
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Explicit criteria are derived that indicate clearly the extent to which constant disturbances can be rejected by the judicious introduction of integral feedback in discrete-time systems.
Upper bound on signal/quantising-noise ratio for television d.p.c.m. systems
- Author(s): Z.S. Bojković
- Source: Electronics Letters, Volume 11, Issue 1, p. 29 –30
- DOI: 10.1049/el:19750021
- Type: Article
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Consideration is given to an upper bound on signal/quantising-noise ratio for television d.p.c.m. systems. The 7.2 dB gain for entropy coding assumes ε entropy of the bit stream of the quantiser output. The calculations are based on Laplacian signals, because television signals at d.p.c.m. quantiser inputs are approximately Laplacian.
Radiation losses from sinusoidal serpentine bends in optical waveguides
- Author(s): A. Ankiewicz
- Source: Electronics Letters, Volume 11, Issue 1, p. 30 –31
- DOI: 10.1049/el:19750022
- Type: Article
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Radiation losses due to curvature in optical waveguides with sinusoidal bends are found in terms of the amplitude and period of the fluctuation. For tolerable loss, the critical factor is the minimum radius of curvature, i.e. the radius of curvature at a point of maximum deviation.
Scintillation limitations on the 2nd-phase-difference range measurement
- Author(s): E. Vilar
- Source: Electronics Letters, Volume 11, Issue 1, p. 31 –32
- DOI: 10.1049/el:19750023
- Type: Article
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The letter investigates the effect of the partly random character of Δ2φ on the 2nd-phase-difference range-measurement technique devised by Burns and Fremow.
Erratum: Numerical test of stability of large sparse matrices and dynamical systems
- Author(s): V. Zakian and C. Papaconstantinou
- Source: Electronics Letters, Volume 11, Issue 1, page: 32 –32
- DOI: 10.1049/el:19750024
- Type: Article
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Erratum: Basic T matrix patterns for 2-port linear transformation networks in the real domain
- Author(s): J. Glover
- Source: Electronics Letters, Volume 11, Issue 1, page: 32 –32
- DOI: 10.1049/el:19750025
- Type: Article
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