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Electronics Letters

Issue 26 • Date December 27 1969

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Displaying Results 1 - 25 of 37
  • Analogue conductivity switch

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (161 KB)

    The current/voltage characteristics of Au-CaF2-n GaAs diodes have been found to exhibit a continuum of memory states, switchable with forward or reverse voltage pulses. The phenomenon is described and a possible charge-trapping mechanism indicated as being responsible. View full abstract»

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  • Admittance of a phase-locked Gunn oscillator at high input powers

    Publication Year: 1969, Page(s):672 - 673
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (275 KB)

    A phase-locked Gunn oscillator can become passive at high input powers. The `reflection¿ coefficient, defined by r=¿(Pout/Pin), can drop to zero. Experiments on this behaviour are compared with a simple theoretical calculation. View full abstract»

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  • Dispersive effects in microstrip on alumina substrates

    Publication Year: 1969, Page(s):673 - 674
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    The effect of dispersion on the phase velocity of microstrip transmission line on 99.5% alumina has been investigated by various methods. A comparison of these methods, together with a sample of the results obtained, is presented. The observed dispersion is discussed, and a simple empirical correction to the TEM approximation is outlined which accounts for this effect in 0.025 in-thick substrates. View full abstract»

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  • Systems with generalised Riccati-Bernoulli nonlinearities

    Publication Year: 1969, Page(s):674 - 675
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (263 KB)

    1st-order nonlinear systems described by a generalised form of Riccati-Bernoulli ordinary differential equations are shown to be reducible to equivalent linear systems of higher order through a nonlinear differential transformation. The method is generalised further to cover systems governed by partial differential equations with Riccati-Bernoulli-type nonlinearities. View full abstract»

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  • Diffraction by an infinite dielectric cylinder due to a normally incident cylindrical wave

    Publication Year: 1969, Page(s):675 - 676
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    The asymptotic value of the electric field diffracted by an infinitely long dielectric cylinder due to a normally incident cylindrical wave is computed by the geometrical theory of diffraction and shows excellent agreement with previous experimental results as well as the exact solution. View full abstract»

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  • Iterative scheme for 1- and 2- dimensional d.c.-transistor simulation

    Publication Year: 1969, Page(s):677 - 678
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    A numerical iterative scheme is presented for the solution of the 1- and 2-dimensional semiconductor d.c. transport equations. This scheme is applied to an n-p-n transistor structure. Input data are geometry, doping profile, boundary conditions and, optionally, mobility dependencies and generation-recombination law. View full abstract»

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  • Simple technique for the accurate determination of delay-time variations in acoustic-surface-wave structures

    Publication Year: 1969, Page(s):678 - 680
    Cited by:  Papers (42)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    A method of determining small variations in delay time of acoustic surface waves is described which is both simple and accurate. As an example, the technique is applied to determining the temperature vanation of delay time of surface waves propagating in the z direction on a y face of lithium niobate. View full abstract»

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  • Simple criterion for the global regularity of vector-valued functions

    Publication Year: 1969, Page(s):680 - 681
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    In the analysis of nonlinear networks it is usually necessary to perform functional inversion. The letter gives a compact and easily applicable criterion for the existence of a unique inverse of an important class of vector-valued functions, referred to as globally regular functions. The criterion is then used to establish global regularity of a few classes of functions in a very simple manner. View full abstract»

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  • Positive network elements, a new class of elements possessing arbitrary hybrid description

    Publication Year: 1969, Page(s):681 - 683
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (469 KB)

    A new class of positive network elements is defined. It is a subclass of nonlinear resistive, capacitive and inductive (and possibly locally active) n-port [or (n+1)-terminal] elements. A positive network element possesses all possible hybrid descriptions. Also, all incremental driving-point resistances for a positive resistive element are themselves positive, as are capacitive and inductive eleme... View full abstract»

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  • Suboptimal control of plants with uncertain parameters

    Publication Year: 1969, Page(s):683 - 684
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    A two-level technique for optimal system design is proposed, in which trajectory sensitivity cost is included with state and control variable terms. The resulting optimal system would be less sensitive to plant-parameter variations than one designed without such a trajectory-sensitivity cost term. View full abstract»

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  • Eigenvalues for higher-order conical-horn modes

    Publication Year: 1969, Page(s):684 - 685
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    Macdonald's formula, which is used to relate the associated Legendre and Bessel functions, is employed to find the approximate eigenvalues for TE and TM modes in a conical horn. Although the formula is restricted to small angles ¿, it nevertheless provides a very simple and accurate method for calculating the eigenvalues of the fundamental and higher-order modes, even for large values of ¿. View full abstract»

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  • Propagation characteristics of inhomogeneous dielectric-filled coaxial cables

    Publication Year: 1969, Page(s):685 - 686
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    A general program has been written for calculating the attenuation and phase characteristics of the first TM surface-wave mode in an inhomogeneous dielectric-filled coaxial cable. As an example, the program has been used to study the special case of a coaxial cable with a very thin dielectric layer on the inner conductor. View full abstract»

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  • B.C.D. serial adder/subtractor

    Publication Year: 1969, Page(s):686 - 687
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    For the pure serial addition or subtraction of binary-coded decimal numbers, a simple network is proposed. It consists of a binary adder and a correction system using another adder. In an arithmetic unit, the position of this adder/subtractor at the beginning of the input/output register simplifies the design. View full abstract»

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  • Enhanced photoemission into n hexane

    Publication Year: 1969, Page(s):687 - 688
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (239 KB)

    A gap between a photocathode and the liquid into which charge emission is directed considerably enhances the magnitude of photocurrent normally obtained. It also makes the process relatively insensitive to electronegative contaminants such as oxygen, even at stresses as low as a few tens of volts per centimetre. View full abstract»

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  • Induced spiking in an ammonia-maser oscillator

    Publication Year: 1969, Page(s):688 - 689
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (311 KB)

    Oscillation pulsations (spiking) have been observed in the operation of an ammonia maser subjected to a periodic modulation of the oscillation condition. View full abstract»

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  • Simulated inductance with a transistor and RC elements

    Publication Year: 1969, Page(s):689 - 691
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (453 KB)

    An active RC circuit with a single transistor can realise a simulated inductance with even infinite Q factor. A design procedure is developed to realise a simulated inductance with infinite Q factor. Examples based on a particular transistor are included. View full abstract»

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  • Influence of second-harmonic frequency termination on Gunn-oscillator performance

    Publication Year: 1969, Page(s):691 - 693
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    Variations of the 2nd-harmonic frequency termination cause the output power of Gunn oscillators to change by a factor of up to five, accompanied by a frequency pulling of a few percent. From detailed impedance measurements it is concluded that the maximum fundamental power occurs if the 2nd-harmonic circuit is tuned near an open-circuit resonance, the total circuit susceptance apparently being som... View full abstract»

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  • Batch fabrication of integral-heat-sink IMPATT diodes

    Publication Year: 1969, Page(s):693 - 694
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (331 KB)

    A new technique for IMPATT-diode fabrication is described, in which the critical portion of the diode heat-flow path is formed as an integral part of the diode. The technique has economic advantages over conventional methods in that all processing steps are performed while diodes are still in wafer form. In addition, the technique permits passivation using standard dielectric deposition techniques... View full abstract»

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  • Example of the generalised-function validity of the Rayleigh hypothesis

    Publication Year: 1969, Page(s):694 - 695
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    The electromagnetic field scattered by a conducting circular cylinder is expressed as an outward-going wave expansion in an eccentrically placed polar-co-ordinate system. It is shown that the expansion is always valid on the cylinder surface in the generalised-function sense but not in the conventional-function sense. View full abstract»

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  • Digital computation of frequency response of multiloop systems

    Publication Year: 1969, Page(s):696 - 697
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    An application-oriented program is described for the digital computation of the frequency response of linear multiloop systems. The main advantage of the program lies in the extreme simplicity of the data requirements and the consequent ease of application. Apart from the values of the parameters of the individual transfer functions comprising the overall system, the only other data required are a... View full abstract»

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  • Variation of microstrip impedance with strip thickness

    Publication Year: 1969, Page(s):697 - 698
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (299 KB)

    The letter indicates the way in which the characteristic impedance of single and coupled microstrip can vary with strip thickness, and points out that, in many cases of current practical interest, in both computer-circuit and microwave technologies, such variation is too large to be ignored without giving rise to serious error. Some typical graphs are given to illustrate this. View full abstract»

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  • Linearly scaled power-factor meters employing solid-state switching circuits

    Publication Year: 1969, Page(s):698 - 700
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (435 KB)

    The letter describes two simple and novel linearly scaled power-factor meters. Solid-state devices are employed as switching elements and a precise indication of power factor is achieved over wide ranges of both current and voltage. View full abstract»

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  • Stability of the damped Mathieu equation

    Publication Year: 1969, Page(s):700 - 701
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    A method developed to generate Lyapunov functionals for distributed-parameter systems is applied to the damped Mathieu equation, the resulting Lyapunov functions giving rise to an improvement in the known stability boundaries. View full abstract»

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  • General least-squares program for fitting functions to data

    Publication Year: 1969, Page(s):701 - 703
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (322 KB)

    A program is described which attempts to fit any function specified in a procedure, to a set of data. The values of a fixed number of disposable constants are systematically adjusted to minimise the sum of squares of differences between values and corresponding points of the function. An example is given of the use of the program in the analysis of an experimental autocorrelation function. View full abstract»

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  • Contribution to the theory of phase-angle loci

    Publication Year: 1969, Page(s):703 - 704
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (311 KB)

    Phase-angle loci for a rational function which has two zeros or two poles only are shown to be portions of rectangular hyperbolas. Simple rules are given for selecting appropriate portions from a prepared family of such curves. An application to root-locus plotting is described. View full abstract»

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Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK