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Electronics Letters

Issue 17 • Date August 21 1969

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Displaying Results 1 - 25 of 29
  • Proposed high-efficiency diode oscillator

    Publication Year: 1969, Page(s):387 - 388
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    A high-efficiency oscillator using an avalanche diode is proposed. View full abstract»

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  • Discharge repetition in an air-filled cavity in high-density polythene under high direct electric stresses at elevated temperatures

    Publication Year: 1969, Page(s):388 - 389
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (325 KB)

    The discharge-repetition rate is appreciably smaller, and the electric strength significantly larger, with high-density than with low-density polythene. This behaviour is consistent with the greater volume resistivity of the high-density material View full abstract»

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  • Polarisation of waves reflected from the ionosphere

    Publication Year: 1969, Page(s):389 - 390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (318 KB)

    The effect of electron collisions on the polarisation of waves reflected from the ionosphere is calculated by an iteration procedure and shown to be relatively small at night for both normal and oblique incidence, at frequencies above 0.5 MHz. View full abstract»

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  • Design algorithms for minimal-order Luenberger observers

    Publication Year: 1969, Page(s):390 - 392
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    A simple method for designing an (n ¿ m)-order Luenberger observer for an nth-order linear deterministic system with m independent outputs is outlined and compared with the observer design method recently suggested by Cumming. View full abstract»

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  • Phase-locked degenerate parametric amplifier

    Publication Year: 1969, Page(s):392 - 393
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (339 KB)

    The phase-locked degenerate parametric amplifier can now be realised in a relatively simple form by making use of the phase-locking properties of Gunn oscillators. The device has applicacation as a low-noise amplifier (having a significantly lower noise figure than nondegenerate amplifiers using the same varactors), as a phase indicator for static phase measurements and as a phase discriminator fo... View full abstract»

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  • Degenerate amplification with semiconductor diodes due to a self-generated avalanche-resonance pump

    Publication Year: 1969, Page(s):393 - 395
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    The features of parametric degenerate and quasidegenerate amplification in silicon avalanche diodes are described for conditions of an optimised self-generated pumping component in the region of the characteristic avalanche-resonance frequency. The signal-frequency gain was observed to be strongly dependent on the pump-voltage amplitude. View full abstract»

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  • High-efficiency self-pulsed IMPATT oscillator circuit

    Publication Year: 1969, Page(s):395 - 396
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (311 KB)

    A circuit is described which uses the d.c. negative resistance of an IMPATT diode, in a microwave anomalous-mode circuit, to operate the diode simultaneously as a low-frequency relaxation oscillator. When operated in this way, the diode produces microwave power in the form of high-efficiency pulses having a high repetition rate. A mean output power of 1.5W with 25% mean efficiency has been achieve... View full abstract»

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  • Nonlinear frequency modulation by noise

    Publication Year: 1969, Page(s):396 - 398
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (413 KB)

    Prior analyses of frequency modulation by noise have assumed a perfectly linear modulator. The effect of nonlinearity on spectral shape and bandwidth is exhibited in one specific case of interest. In the linear case, a discrete spectral line may exist at carrier frequency; it is shown that such a line can never exist under nonlinear modulation. View full abstract»

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  • Second-derivative sensitivity using the concept of the adjoint network

    Publication Year: 1969, Page(s):398 - 399
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (235 KB)

    Second-derivative sensitivities for linear time-invariant networks are derived by an extension of the method used by Director and Rohrer to calculate first-derivative sensitivities. View full abstract»

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  • New analysis tool for graphs

    Publication Year: 1969, Page(s):399 - 401
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    The variable incidence set of a graph is defined and its usefulness demonstrated in reducing a graph by identifying specified vertices and removing self loops, testing for connectedness, and generating specified segs, cosegs and cutsets. View full abstract»

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  • Highly stable RC active filters

    Publication Year: 1969, Page(s):401 - 402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The letter deals with an RC active filter of the feedback kind. The principle of the proposed circuit is based on Bangert's method. To compare this method with Yanagisawa's method, the same transfer function is used in the letter as is illustrated in Yanagisawa's paper. View full abstract»

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  • Dispersive Rayleigh waves on quartz

    Publication Year: 1969, Page(s):402 - 403
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    The dispersive properties of Rayleigh waves propagating in the xdirection of ycut quartz have been measured with thin films of gold, copper and silver deposited on the free surface. It is found that the attenuation of the surface waves increases sharply with increasing thickness of the metallic films. View full abstract»

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  • Program for selecting a tree of a connected network and for finding the corresponding F matrix

    Publication Year: 1969, Page(s):403 - 404
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    In network-analysis procedures, particularly those using the state-variable formulation of the problem, the selection of a tree and the formation of the corresponding F matrix is of considerable importance. An algorithm has been devised to perform the tree selection and F matrix formation and has been embodied in a FORTRAN IV subroutine. The letter describes the specification of this program. View full abstract»

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  • Computation of near-field aperture diffraction by a cylinder

    Publication Year: 1969, Page(s):404 - 406
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (379 KB)

    A method of computing the effect of a cylindrical obstacle in the near field of an aperture antenna is described. The measured and calculated results for a typical case are then presented and other results discussed. View full abstract»

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  • Two-dimensional solution of the d.c. characteristics for the m.o.s.t.

    Publication Year: 1969, Page(s):406 - 408
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (450 KB)

    A method is outlined for the determination of a 2-dimensional solution of the potential distribution in the substrate of the m.o.s.t., based on the complete depletion-neutral approximation. Channel current is derived from a 1-dimensional solution of the continuity equation along the silicon-silicon dioxide interface, for given values of extrinsically applied electrode potentials. Theoretical chara... View full abstract»

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  • Dynamic elastance of a Gunn diode

    Publication Year: 1969, Page(s):408 - 409
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (297 KB)

    The time-varying elastance of a Gunn diode is deduced by the application of a simple domain-growth and decay model. The time variation of the elastance is seen to be significantly different from the previously assumed ideal pulsed nature. View full abstract»

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  • Tolerance of nonlinearities in linear optical regulators with integral feedback

    Publication Year: 1969, Page(s):409 - 410
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (265 KB)

    The letter generalises some of the known theory of optimal regulators with proportional plus integral feedback. It is also shown that the fact of optimality implies that the regulators have some very desirable properties from an engineering point of view. View full abstract»

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  • Cutoff wavelengths and frequencies of standard rectangular waveguides

    Publication Year: 1969, Page(s):410 - 412
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (421 KB)

    The errors arising from the customary assumption that standard rectangular waveguides have perfectly rectangular cross-sections and are operated in vacua are discussed. Correct cutoff wavelengths and frequencies for 36 standard waveguides in air are tabulated; the values given deviate from the customary ideal values by as much as 0.9%. View full abstract»

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  • Output saturation in GaP red lamps

    Publication Year: 1969, Page(s):412 - 413
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (301 KB)

    The variation of light output with current in a diode lamp is analysed. It is assumed that, while luminescent recombination processes saturate at high current, competing nonluminescent processes do not. The derived relationship is compared with published experimental work. View full abstract»

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  • High-resolution laser interferometer for measurement of electron density in transient plasma

    Publication Year: 1969, Page(s):413 - 415
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    A laser interferometer of the Mach-Zehnder type based on the use of a single-mode frequency-stabilised He-Ne gas laser, 6329 Å in wavelength and with 100 ¿V output, has been used to measure accurately electron densities in the range 1014¿1015cm¿3 in a transient mercury-vapour plasma. An `amplitude¿ (intensity) modulation system is employed in order to obtain a wide dynamic range. The interfer... View full abstract»

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  • Equivalent circuit of an evanescent-mode inductive element

    Publication Year: 1969, Page(s):415 - 416
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    By the use of a partial-fraction expansion of the propagation constant in terms of the angular frequency, a successive series of equivalent-circuit approximations is obtained for the parallel element in the II representation of a length of evanescent-mode waveguide. The first of these approximations simply adds a parallel capacitance to the low-frequency inductance, an element which can be readily... View full abstract»

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  • Rayleigh hypothesis in scattering problems

    Publication Year: 1969, Page(s):416 - 417
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (434 KB)

    It is shown that the validity of the Rayleigh hypothesis is dependent on the distribution of singularities in the analytic continuation of the exterior scattered field; the hypothesis is fulfilled if, and only if, these are concentrated in a sufficiently small domain. Conclusions reached by Burrows in a recent letter are criticised. View full abstract»

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  • Resonance-frequency behaviour of a cavity with an evanescent section

    Publication Year: 1969, Page(s):418 - 419
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    The resonance frequency fr of a waveguide cavity, with an evanescent air gap of length d and symmetrically loaded with dielectric (length t), has two distinct types of behaviour that depend on t. If for d = 0, fr0 ¿ fr0 > fc0, where fca is the cutoff frequency of the air section, fr decreases for increasing d and approaches fca. However, if fr0 < fca, fr increases and approaches a constant value ... View full abstract»

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  • Un resultat sur l'application de procédés limites de synthèse à des fonctions booléennes (Result of limited synthesis procedures applied to switching)

    Publication Year: 1969, Page(s):419 - 420
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    Lors de l'essai de synth¿¿se d'une fonction Bool¿¿enne par une m¿¿thode qui ne permet pas d'atteindre toutes les fonctions compl¿¿tes, la probabilit¿¿ de succ¿¿s est plus ¿¿lev¿¿e si la fonction est quelconque (et, en particulier, incompl¿¿te) que si elle est compl¿¿te. On donne ici une limite inf¿¿rieure du gain moyen. When it is attempted to synthetise a switching function by a given limited met... View full abstract»

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  • New analysis of f.e.t. saturation

    Publication Year: 1969, Page(s):420 - 422
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (333 KB)

    A new study of the saturation phenomenon of a junction, f.e.t. including the rise of voltage outside the channel, is proposed. This study is based on an approximate solution of the bidimensional Poisson equation with appropriate boundary conditions. Experimental evidence is also presented. 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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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