Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 7, Issue 1, 14 January 1971
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Volume 7, Issue 1
14 January 1971
Observation of high-field domains in n type indium phosphide
- Author(s): P.M. Boers ; G.A. Acket ; D.H. Paxman ; R.J. Tree
- Source: Electronics Letters, Volume 7, Issue 1, p. 1 –2
- DOI: 10.1049/el:19710001
- Type: Article
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Transit-time oscillations involving dipole domains in long samples of InP are reported. Impact ionisation can occur within the domains. The domain velocity was determined by probe measurements. Under certain circumstances, oscillations at frequencies much higher than the transit-time frequency were observed. Conclusions concerning the velocity/field characteristic are presented.
Experimental hearing-aid circuit with an input-variable transfer function for the correction of cochlear deafness
- Author(s): E. Trinder
- Source: Electronics Letters, Volume 7, Issue 1, p. 2 –3
- DOI: 10.1049/el:19710002
- Type: Article
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An instantaneous compression circuit is described, designed to compensate for the distorted loudness function due to cochlear damage of a deaf ear. The system consists of a root-taking circuit, the root index being the dynamic range of the deaf ear over the dynamic range of the normal ear. The reference level and maximum output are just below the discomfort level of the ear.
Simultaneous generation of the partial derivatives of network polynomial coefficients: further details and results
- Author(s): O.P.D. Cutteridge and P.H. di mambro
- Source: Electronics Letters, Volume 7, Issue 1, p. 3 –4
- DOI: 10.1049/el:19710003
- Type: Article
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A method was described recently by the authors for the simultaneous evaluation of the coefficients of a number of network polynomials and the formation of the first and second partial derivatives of these coefficients with respect to the network elements. The present letter gives further details, with respect mainly to the evaluation of second partial derivatives, and results.
Loaded short-slot antenna with enhanced radiation or improved directivity
- Author(s): T.Z. Hsieh ; D.P. Nyquist ; K.M. Chen
- Source: Electronics Letters, Volume 7, Issue 1, p. 5 –7
- DOI: 10.1049/el:19710004
- Type: Article
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The circuit and radiation properties of a short-slot antenna doubly shunt loaded by lumped impedances are investigated experimentally. It is demonstrated that the electric-field distribution in the slot can be controlled by appropriate adjustment of the shunt impedances. Optimum capacitive loadings are determined to implement slot fields having either a nearly uniform distribution leading to enhanced radiation, or a reversed-phase distribution leading to improved directivity.
Conditions on the group delay of transmittances
- Author(s): J. Neirynck
- Source: Electronics Letters, Volume 7, Issue 1, p. 7 –8
- DOI: 10.1049/el:19710005
- Type: Article
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The necessary and sufficient conditions are given for a function to be the group delay of a passive 2-port transmittance. In some important particular cases, more stringent conditions must be imposed. It appears that the realisability of the classical Thomson and Abele families in these cases is purely incidental, and that the last family is actually restricted to low ripples.
Computer modelling of bipolar logic gates
- Author(s): N.B. Rabbat ; W.D. Ryan ; S.Q.A.M.A. Hossain
- Source: Electronics Letters, Volume 7, Issue 1, p. 8 –10
- DOI: 10.1049/el:19710006
- Type: Article
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A basic approach to the computer modelling of large arrays of bipolar gates using continuous analytic expressions is presented. A program has been written which applies this principle. It can handle complex situations and is justified on grounds of efficiency with l.s.i. circuits.
Online identification of a drifting system using generalised Kalman filtering
- Author(s): R.G. Witcomb
- Source: Electronics Letters, Volume 7, Issue 1, p. 10 –11
- DOI: 10.1049/el:19710007
- Type: Article
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The letter describes an online method for the identification of drifting parameters of a sampled-data system. The model used describes both the plant and the noise.
Yagi aerials and the Hansen-Woodyard condition
- Author(s): P. Miller
- Source: Electronics Letters, Volume 7, Issue 1, page: 11 –11
- DOI: 10.1049/el:19710008
- Type: Article
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The phase delay which gives maximum gain is considered, and expressions for it are obtained.
Suppression of parasitic thick-field conduction mechanisms in silicon-gate m.o.s. integrated circuits
- Author(s): P. Richman
- Source: Electronics Letters, Volume 7, Issue 1, p. 12 –13
- DOI: 10.1049/el:19710009
- Type: Article
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In a silicon-gate m.o.s. integrated circuit, because of the presence of the additional polycrystalline-silicon interconnection layer, it is possible virtually to eliminate parasitic thick-field transistor action at certain critical points in the circuit by employing an earthed polycrystalline-silicon region as an electrostatic shield between metal and substrate.
Lithium metagermanate: a new material for acoustic-surface-wave applications
- Author(s): F.W. Ainger ; G.J. Rich ; D.S. Robertson ; A.F. Saunders ; A.S. Young
- Source: Electronics Letters, Volume 7, Issue 1, p. 13 –14
- DOI: 10.1049/el:19710010
- Type: Article
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Preliminary measurements of parameters of lithium germanate which are relevant to acoustic-surface-wave devices are presented. The material is cheap to produce compared with some other substrates and its electromechanical coupling factor is moderate (̃10%). The major fault is a lack of resistance to water.
Parametric beam-steering technique for acoustic waves with applications to signal processing
- Author(s): V.L. Newhouse
- Source: Electronics Letters, Volume 7, Issue 1, p. 14 –16
- DOI: 10.1049/el:19710011
- Type: Article
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It is predicted that two acoustic waves crossing at right angles in a suitably dispersive nonlinear medium will generate a sum-frequency beam in a direction determined by the ratio of their frequencies. This phenomenon makes possible new switching, variable-delay, filtering and correlation devices.
Narrow-beam antennas using an artificial dielectric medium with permittivity less than unity
- Author(s): K.C. Gupta
- Source: Electronics Letters, Volume 7, Issue 1, p. 16 –18
- DOI: 10.1049/el:19710012
- Type: Article
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Radiation from a line source of electric current placed inside a slab of artificial dielectric medium with a permittivity less than unity has been studied. It is found that radiation patterns with single or multiple narrow beams may be obtained by the proper choice of parameters. In a typical case for εr=0.1378, μr=1.322, a beamwidth of about 1° is obtained when the thickness of artificial dielectric slab is about 2.33 times the wavelength.
Dyadic modal control of multi-input time-invariant linear systems incorporating integral feedback
- Author(s): B. Porter and H.M. Power
- Source: Electronics Letters, Volume 7, Issue 1, p. 18 –19
- DOI: 10.1049/el:19710013
- Type: Article
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In the letter, the possibility of applying dyadic modal control to multi-input time-invariant linear systems incorporating integral-feedback action is investigated. In those cases for which such application is possible, simple closed-form formulas are obtained for the feedback-loop gains of the appropriate dyadic modal controller.
Algorithm for analysis of general linear active networks
- Author(s): C. Vidallon and J.C. Matheau
- Source: Electronics Letters, Volume 7, Issue 1, p. 19 –21
- DOI: 10.1049/el:19710014
- Type: Article
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The steady state of the most general active linear network can be obtained by methods using very frequently high-order matrices which contain a great number of zeros. A method is proposed which avoids this, the order of the ‘active’ matrix being equal to the number of controlled sources introduced in the network.
Q band GaAs Schottky-barrier IMPATT
- Author(s): J.M. Rodgers and Robina C. Pomeroy
- Source: Electronics Letters, Volume 7, Issue 1, page: 21 –21
- DOI: 10.1049/el:19710015
- Type: Article
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Microwave power at Q band is reported from GaAs Schottky-barrier avalanche diodes. A nickel-contacted epitaxial GaAs structure in a flipped mesa configuration was used. In a Q band waveguide cavity, 0.5 W was obtained at 26.7 GHz using a pulsed voltage source.
Transient analysis of modified t.t.l. gate
- Author(s): N.B. Rabbat ; W.D. Ryan ; S.Q.A.M.A. Hossain
- Source: Electronics Letters, Volume 7, Issue 1, p. 22 –24
- DOI: 10.1049/el:19710016
- Type: Article
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The letter derives expressions for the transient response of the modified t.t.l. NAND/NOR gate using a piecewise linear analysis. The expressions are presented in a form suitable for incorporation into a computer-aided circuit-analysis program based on the macromodelling concept and intended for the analysis of relatively large arrays of integrated-circuit logic gates. Results are compared with experimental observations.
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