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Electronics Letters

Issue 19 • Date September 18 1969

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Displaying Results 1 - 19 of 19
  • Logic hybrid computers: an essential operator

    Publication Year: 1969 , Page(s): 443 - 444
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (233 KB)  

    A class of sequential logic circuits that simulate dynamical systems is discussed, and it is shown that an augmentation operator is fundamental to such systems. The logic for this operator is presented for a specific instance of coding, and a simple simulation is described. View full abstract»

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  • Special class of symmetric Boolean functions: proof and comment

    Publication Year: 1969 , Page(s): 444 - 446
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (392 KB)  

    The existence of a special class of totally symmetric functions has been reported in an earlier letter. In this letter, a formal proof substantiating this existence is presented. It is also pointed out that in each ncube there are two such functions which are complements of each other. View full abstract»

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  • Computation of electric-field configurations in anisotropic electro-optic crystals

    Publication Year: 1969 , Page(s): 446 - 447
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (309 KB)  

    In electro-optic-light-modulator design, it is desirable to know the potential distribution with in the crystal. The cell is represented by a mathematical model, and it is pointed out that this type of problem can be analysed by means of recently developed computing techniques. Details of the method are discussed and, for a specific modulator, computed values are compared with those obtained in pr... View full abstract»

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  • Mean electron energy in a CO2 laser plasma

    Publication Year: 1969 , Page(s): 447 - 448
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (410 KB)  

    It is argued that measurements made using microwave radio-metric techniques represent a true mean electron energy for the CO2 laser plasma. They agree well with some other experimental values, and excellently with a theoretically calculated value. View full abstract»

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  • Short-term frequency stability of the HCN maser

    Publication Year: 1969 , Page(s): 448 - 449
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (342 KB)  

    Factors affecting the short-term fluctuations of the frequency of c.w. HCN masers have been investigated. Improving the plasma stability reduced these fluctuations to 10 kHz (1 in 108) for an observation time of 0.5 s. View full abstract»

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  • Technique for improving the frequency/temperature characteristics of 3cm-band Gunn oscillators

    Publication Year: 1969 , Page(s): 449 - 450
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (253 KB)  

    A Gunn oscillator was used to stabilise another by injection locking. Over an ambient temperature range of +50 to ¿20°C, the frequency drift of ¿0.46 MHz/degC was reduced to +1.4 kHz/degC. The practical limit to the stability is set by changes in the pulling of the control-source frequency, but some improvement is possible by increasing the isolation between the oscillators. View full abstract»

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  • Observation of Doppler-shifted acoustic cyclotron resonance in the frequency spectrum of the microwave emission from ntype InSb

    Publication Year: 1969
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (156 KB)  

    The frequency spectra between 1.8 and 3GHz of the microwave radiation emitted from ntype InSb samples orientated along the [110] direction showed maxima in a transverse magnetic field, which can be attributed to Doppler-shifted acoustic cyclotron resonance. View full abstract»

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  • General power-series description of multiplicative nonlinear systems

    Publication Year: 1969 , Page(s): 450 - 452
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (378 KB)  

    A method of generalising the linear concepts of state and state transition to include multiplicative nonlinearities is presented. Using the algebra of multidimensional arrays, nonlinearities are represented by power series of the Volterra form. The resulting index notation allows a direct translation into computer-program languages. View full abstract»

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  • Initial time constants of the Gunn-domain space-charge growth

    Publication Year: 1969 , Page(s): 452 - 453
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (252 KB)  

    The initial time constants of the space-charge growth are evaluated for the region of nonuniform donor density and roughly estimated for the space-charge region at the cathode. The space-charge growth rate determines the domain-voltage time constants. These time constants are smaller than the time constant of a domain growing from the random fluctuations of the electric field. View full abstract»

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  • Error-free identification using maximally orthogonal p.r.b.n. sequences

    Publication Year: 1969 , Page(s): 453 - 455
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (359 KB)  

    Crosscorrelation using pseudorandom binary noise as the test signal is a well established technique for the identification of linear systems, but there are several practical difficulties. We show that two of these difficulties, namely the necessity to have fast clock rates and a long p.r.b.n. period can be eliminated by using interclock sampling and by analytically removing folding errors. Further... View full abstract»

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  • Observation of multiple high-field domains in a dielectric-surface-loaded GaAs bulk element

    Publication Year: 1969 , Page(s): 455 - 456
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (290 KB)  

    By observing potential distributions and corresponding current waveforms of a partially dielectric-surface-loaded GaAs bulk element, it is found that a domain nucleated at the unloaded cathode region fades away under the loaded region, nucleating another new domain at the cathode. This fading decreases with time after the application of a bias voltage, and eventually several domains of the same si... View full abstract»

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  • Electrode interactions in acoustic surface-wave transducers

    Publication Year: 1969 , Page(s): 456 - 457
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (295 KB)  

    Results are given which show the importance of acoustic interactions in interdigital surface-wave transducers on piezoelectric materials. View full abstract»

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  • Stability of feedback systems containing a single monotonic nonlinearity

    Publication Year: 1969 , Page(s): 457 - 458
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (260 KB)  

    It is shown that the form of multiplier Z(s) developed by Narendra and Yo Sung Cho for establishing the stability of feedback systems containing a single odd monotonic non-linearity is equally applicable to systems with a monotonic nonlinear feedback. The constraints on the coefficients of Z(s) are further relaxed. View full abstract»

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  • Realisation of transfer functions using one amplifier

    Publication Year: 1969 , Page(s): 458 - 460
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (400 KB)  

    A new procedure is described for the realisation of a voltage transfer function C(s) by an earthed RC network incorporating a finite-gain amplifier. The method is applicable, barring a few minor restrictions, to a general G(s), and can realise zeros of transmission on the positive real axis. View full abstract»

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  • Electric strength of fluorocarbon liquids under repetitive pulse voltages

    Publication Year: 1969 , Page(s): 460 - 461
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (289 KB)  

    High-voltage pulses from a radar modulator have been used to determine the electric strength of two fluorocarbon insulating liquids. The effects of electrode spacing and pulse duration have been investigated. View full abstract»

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  • Switching mechanism in chalcogenide glasses

    Publication Year: 1969 , Page(s): 461 - 462
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (297 KB)  

    The characteristics of the switching phenomena observed in chalcogenide glasses are described in terms of the Joule heating within the material. Calculations for an infinite-slab geometry are given. The model is also used to explain the nonohmic behaviour observed in the low-conductance state. View full abstract»

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  • Anodic oxide electrets

    Publication Year: 1969 , Page(s): 462 - 463
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (276 KB)  

    Anodic oxide films on aluminium have been found to be electrets. The direction of the associated electric field implies a distribution of fixed negative charges within the oxide. View full abstract»

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  • Analysis of linear microstrip using an arbitrary ferromagnetic substance as the substrate

    Publication Year: 1969 , Page(s): 463 - 465
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (340 KB)  

    A Green's function of the vector potential for a microstrip is derived on the basis of the image theory after Silvester and the duality property of electric and magnetic fields of the TEM mode. It is also shown that the stationary equation similar to the variational equation for the electrostatic capacitance of the microstrip is given for its inductance with a magnetic substrate. View full abstract»

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  • Determination of pulse-transfer function of a digital filter from prescribed partial requirements

    Publication Year: 1969 , Page(s): 465 - 466
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (280 KB)  

    An integral formula is given which enables the unique determination of the pulse-transfer function (p.t.f.) of a linear-time-invariant (l.t.i.) digital filter from its real or imaginary part defined on the unit circle in the z¿1 plane. 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