Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 5, 6 March 1969
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Volume 5, Issue 5
6 March 1969
Adaptive-logic trees for use in multilevel-circuit design
- Author(s): D.H. Green and P.W. Foulk
- Source: Electronics Letters, Volume 5, Issue 5, p. 83 –84
- DOI: 10.1049/el:19690059
- Type: Article
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p.
83
–84
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A logic tree employing only 2-input gates is described which is capable of mechanising any desired function of the variable set. The tree can therefore represent either a fixed relationship, or vary adaptively by adjusting the input parameters. It is shown that this structure can be used to derive economic multilevel representations of functions directly from the canonical form which require only 2-input gates. The design procedure can operate effectively with only a simple set of design rules.
Measurement of ferrite parameters at microwave frequencies
- Author(s): F.W. Schott and T.F. Tao
- Source: Electronics Letters, Volume 5, Issue 5, p. 84 –86
- DOI: 10.1049/el:19690060
- Type: Article
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p.
84
–86
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A method for determining, at microwave or millimetre-wave frequencies, the relative permittivity and the saturation magnetisation of a ferrite is described. The method is based on the measurement of the guide wavelength in a rectangular guide completely filled with the ferrite and magnetised transversely. Tentative results are presented.
New feedback-stabilised analogue multiplier
- Author(s): H. Brüggemann
- Source: Electronics Letters, Volume 5, Issue 5, p. 86 –88
- DOI: 10.1049/el:19690061
- Type: Article
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p.
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–88
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An analogue multiplier consisting of controlled current-splitting devices and a feedback technique to stabilise its transfer characteristics is presented. An implementation of the technique making use of the exponential characteristics of the bipolar transistor is described. Results showing good agreement with theory are given. The features of the multiplier are:(i) Independence of transistor parameters(ii) Essential temperature independence(iii) Broadband application(iv) Designability(v) Potentially realisable in i.c. form
Frequency response of a thin-film transmission line
- Author(s): I.W. Stanley and T.J. Burslem
- Source: Electronics Letters, Volume 5, Issue 5, p. 88 –89
- DOI: 10.1049/el:19690062
- Type: Article
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88
–89
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This letter presents experimental and theoretical results for the attenuation of a terminated thin-film transmission line at frequencies up to 1 MHz.
Gain stabilisation of parametric amplifiers
- Author(s): J.C. Vokes and K.R. Heath
- Source: Electronics Letters, Volume 5, Issue 5, p. 89 –90
- DOI: 10.1049/el:19690063
- Type: Article
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–90
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A method of stabilising the gain of a parametric amplifier from the pumped conduction current of a varactor diode is described. Long-term stabilities of 0.1dB/week have been achieved on a 13dB-gain amplifier with diode currents of less than 1 μA.
New principle for wideband mode coupling
- Author(s): A.L. Cullen and O.J. Davies
- Source: Electronics Letters, Volume 5, Issue 5, p. 90 –91
- DOI: 10.1049/el:19690064
- Type: Article
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–91
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A new principle using quasiperiodic coupling is put forward as a possibility for broadband mode coupling. An example is given with computed results to illustrate the principle.
Rectangular-pulse generator and memory element with a Gunn diode
- Author(s): D. Boccon-Gibod
- Source: Electronics Letters, Volume 5, Issue 5, p. 91 –92
- DOI: 10.1049/el:19690065
- Type: Article
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91
–92
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A circuit which utilises a Gunn diode with a coaxial line to generate rectangular waves is described. This circuit operating in the frequency range up to 200MHz can also behave as a memory element.
Thermal effects in modulated IMPATT oscillators
- Author(s): G. Weidmann and H.J. Thaler
- Source: Electronics Letters, Volume 5, Issue 5, p. 92 –94
- DOI: 10.1049/el:19690066
- Type: Article
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–94
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The modulation sensitivity and the inherent a.m. percentage of IMPATT oscillators with internal current modulation were measured as a function of the modulation frequency in the range 10Hz-1 MHz. Although constant above 100kHz, both quantities were found to vary with the modulation frequency below 100kHz. Assuming thermal effects as the origin of these variations, the possible relative change of the modulation sensitivity was calculated to be about 20%, taking into account the temperature dependence of the ionisation coefficient and of the drift velocity. With Q factors ranging between 20 and 150, the modulation sensitivity varied between 3 and 0.3 MHz/mA, and the ratio of a.m. percentage and modulating current varied between 7 and 10% per mA.
Series operation of avalanche transistors
- Author(s): T.H. O'Dell
- Source: Electronics Letters, Volume 5, Issue 5, p. 94 –95
- DOI: 10.1049/el:19690067
- Type: Article
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–95
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A switch made up from four avalanche transistors is described It produces 80V across a 50Ω load in less than 1ns, and the jitter with respect to the trigger pulse is less than 30ps.
Mode coefficients in a sectoral horn by ray theory
- Author(s): M.A.K. Hamid
- Source: Electronics Letters, Volume 5, Issue 5, p. 95 –96
- DOI: 10.1049/el:19690068
- Type: Article
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–96
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The geometrical-optics field incident at the waveguide-feed junction of a sectoral horn is expanded in terms of the horn eigenfunction, and an approximate expression in terms of the horn eigenfunctions, and an approximate expression for the excited modes is derived.
Comment: Criterion for the stability of a fourth-order position control system
- Author(s): J.L. Willems
- Source: Electronics Letters, Volume 5, Issue 5, p. 96 –97
- DOI: 10.1049/el:19690069
- Type: Article
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–97
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It is shown that a result of a recent letter on the global stability of a fourth-order nonlinear position control system is incorrect. Further results on this system are obtained.
Reply: Criterion for the stability of a fourth-order position control system
- Author(s): R.W. McGee
- Source: Electronics Letters, Volume 5, Issue 5, page: 97 –97
- DOI: 10.1049/el:19690070
- Type: Article
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Approximation theorem for establishing root-locus topology
- Author(s): H.M. Power
- Source: Electronics Letters, Volume 5, Issue 5, p. 97 –99
- DOI: 10.1049/el:19690071
- Type: Article
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p.
97
–99
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An algebraic approximation theorem is formulated which enables topologies of root-locus plots to be established by grouping poles and zeros into regions R1 and R2 so that, for points s1 in R1 and s2 in R2, |s1| ≪ |s2|.
Partial-fraction expansion and inversion of rational Laplace transforms
- Author(s): R. Piessens
- Source: Electronics Letters, Volume 5, Issue 5, p. 99 –100
- DOI: 10.1049/el:19690072
- Type: Article
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p.
99
–100
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A general method is given for partial-fraction expansion and inversion of rational Laplace transforms. The method produces small roundoff errors and saves computing time. A program based on the method has been written.
Transistor thermal-resistance measurement using the ultralinear-thermometer principle
- Author(s): A. Ambrózy
- Source: Electronics Letters, Volume 5, Issue 5, p. 100 –101
- DOI: 10.1049/el:19690073
- Type: Article
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–101
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To determine the transistor thermal resistance, one of the temperature-dependent parameters of the transistor (e.g. VEB must be measured. Unfortunately, this also depends on VCB, which alters, changing the heating power. A relatively simple and accurate ΔVEB method is proposed, insensitive to collector-voltage variations.
Recovery of random data from additive noise using real-time correlation of probability functions
- Author(s): L.E. Schnurr
- Source: Electronics Letters, Volume 5, Issue 5, p. 101 –103
- DOI: 10.1049/el:19690074
- Type: Article
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p.
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–103
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A method of random-data detection applicable to cases of low-voltage signal/noise ratios is described. The characteristics of noise, with and without the signal present, are discussed, and an outline of the detection principle and the practical detection system is given. System performance is considered.
Pulsed J band (12.4–18 GHz) Gunn-effect oscillators
- Author(s): A.L. Edridge ; F.A. Myers ; B.J. Davidson ; J.C. Bass
- Source: Electronics Letters, Volume 5, Issue 5, p. 103 –104
- DOI: 10.1049/el:19690075
- Type: Article
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–104
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The performance is discussed of J band pulsed Gunn-effect oscillators with typical power outputs of 7 W and efficiencies of 9%. It is concluded that, in view of the high biasing fields used and their comparatively high efficiencies, the devices are operating in the hybrid domain mode.
Electromagnetic resonances of a free ferrite sphere
- Author(s): I. Wolff
- Source: Electronics Letters, Volume 5, Issue 5, p. 104 –106
- DOI: 10.1049/el:19690076
- Type: Article
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104
–106
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Calculation of the axial-symmetric modes of the electromagnetic resonances in an open ferrite sphere is described. The diameter of the sphere and the wavelength of the field are of the same order, and the electric field cannot be neglected, necessitating the solution of an eigenvalues problem subject to Maxwell's equations.
Phase variability of omega navigational transmissions
- Author(s): J. Galejs
- Source: Electronics Letters, Volume 5, Issue 5, p. 106 –107
- DOI: 10.1049/el:19690077
- Type: Article
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p.
106
–107
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Field-strength and phase-delay measurements made on a transatlantic propagation path are compared with calculations where the effective attenuation rate is decreased as the propagation is changed from the south-north direction to the general west-east direction.
Gunn-effect cavity-controlled generator
- Author(s): T.G. Shevchenko and Yu.A. Tsvirko
- Source: Electronics Letters, Volume 5, Issue 5, p. 107 –109
- DOI: 10.1049/el:19690078
- Type: Article
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p.
107
–109
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Equations describing oscillations of a Gunn generator coupled to an external resonant circuit in some cases coincide with the equations of motion of a 1-dimensional harmonic oscillator changing its equilibrium point and friction coefficient by jumping. The condition for the phase trajectory to be closed results in a simple dependence between the resonant-mode parameters and gives also tuning limits for such a mode.
Erratum: High-Q factor circuit with reduced sensitivity
- Author(s): T. Deliyannis
- Source: Electronics Letters, Volume 5, Issue 5, page: 109 –109
- DOI: 10.1049/el:19690079
- Type: Article
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Erratum: Spectral response of a point-contact diode in the submillimetre range
- Author(s): E.J. Becklake ; L. Cram ; B. Prewer
- Source: Electronics Letters, Volume 5, Issue 5, page: 109 –109
- DOI: 10.1049/el:19690080
- Type: Article
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Erratum: Suggestion for an i.c. fast parallel multiplier
- Author(s): R. De Mori
- Source: Electronics Letters, Volume 5, Issue 5, page: 109 –109
- DOI: 10.1049/el:19690081
- Type: Article
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Erratum: Small-hole couplers
- Author(s): C.G. Someda
- Source: Electronics Letters, Volume 5, Issue 5, page: 109 –109
- DOI: 10.1049/el:19690082
- Type: Article
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Erratum: Effet du sens de croissance du champ électrique sur les conditions de claquage par avalanche (Directional effect of electric-field growth on a avalanche-breakdown conditions)
- Author(s): J. Urgell
- Source: Electronics Letters, Volume 5, Issue 5, page: 109 –109
- DOI: 10.1049/el:19690083
- Type: Article
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