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Electronics Letters

Issue 23 • November 13 1969

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Displaying Results 1 - 22 of 22
  • Self modulation at gigahertz frequencies of a diode laser coupled to an external cavity

    Publication Year: 1969, Page(s):571 - 572
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (311 KB)

    An external cavity coupled to a continuously operating GaAs diode laser has been found to cause modulation of the light output at a frequency within the range of 0.6¿2.2GHz. The modulation depth is close to 100% and the linewidth is 200kHz. View full abstract»

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  • Electromagnetic scattering by a helical sheath

    Publication Year: 1969, Page(s):572 - 574
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    The harmonic-series solution for the scattering by a unidirectionally conducting helical sheath is obtained when the medium external to the sheath is different from the internal one. The expressions for the scattering cross-sections and surface charge density are also given. View full abstract»

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  • First-order correction for zero-order hold distortion in sampled-data filters

    Publication Year: 1969, Page(s):574 - 575
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (193 KB)

    Three 1st-order equalisers for zero-order hold distortion are described. Two, with z transform transfer functions, are suitable for applications with a variable sampling frequency. The other, for fixed sampling-frequency applications such as p.c.m., provides better equalisation with a simple RC network. View full abstract»

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  • Current-mode circuits for ternary-logic realisation

    Publication Year: 1969, Page(s):575 - 577
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (301 KB)

    High-speed current-mode circuits for the realisation of ternary combinational logic expressions are described. View full abstract»

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  • Algorithms for majority-logic check equations of maximal-length codes

    Publication Year: 1969, Page(s):577 - 579
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (350 KB)

    Further properties of maximal-length codes are briefly descnbed. These are shown to be of value in deriving the majority-logic check equations. Examples illustrating the effectiveness of the algorithms are given for (15, 4) and (31, 5) maximal-length codes. View full abstract»

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  • Digital communication in fading channels using incoherent carriers

    Publication Year: 1969, Page(s):579 - 581
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (370 KB)

    Possibilities of efficient digital communication through a fading channel, using a narrowband noise carrier, have been investigated both theoretically and experimentally. It is shown that, for a carrier spread Bn ¿ 0.9 f2c (fc, being the mean carrier frequency in megahertz), the system performs better than a 4-fold equal-gain diversity system. Error rates against the channel carrier/noise ratio (... View full abstract»

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  • Equivalent circuit for the acoustoelectric oscillator

    Publication Year: 1969, Page(s):581 - 583
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    An equivalent circuit is proposed for the acoustoelectric oscillator, and results are presented which show that the circuit can provide a good analogue of a practical device. Suppression of oscillations and changes of the resonant frequency were observed when an oscillator was connected to a reactive load. Both of these effects may be explained in terms of the equivalent circuit. View full abstract»

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  • Low-frequency operation of avalanche diodes under large-signal conditions

    Publication Year: 1969, Page(s):583 - 585
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (478 KB)

    Application of basic Read theory to the operation of avalanche diodes at frequencies of fractions of the transit frequency is found to predict high-efficiency oscillations when a waveform consisting of a low-amplitude fundamental and a larger second harmonic in the appropriate phase is applied. The resultant-circuit current is such that the power output is essentially at the fundamental frequency. View full abstract»

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  • Unsymmetrical bandpass and bandstop digital filters

    Publication Year: 1969, Page(s):585 - 586
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    The letter describes a transformation yielding unsymmetrical bandpass and bandstop filter pulse-transfer functions (p.t.f.s) by transforming a reference lowpass p.t.f. This function turns out not to be directly realisable since it is not an allpass transformation. It is shown that this transformation is the application of the Zdunek transformation in the z¿1 plane. View full abstract»

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  • Mismatched linear active 2-ports

    Publication Year: 1969, Page(s):586 - 588
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (322 KB)

    A resistively mismatched linear active 2-port can be designed for a given performance factor, so that its power gain is optimum. In this process, a cubic equation has to be solved numerically by hand or machine. Simple and closely accurate analytic solutions for this equation have now been obtained with an error less than 1.5%. View full abstract»

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  • Controlled wide-range quadrature phase-shift network

    Publication Year: 1969, Page(s):588 - 589
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    A system is described which produces a 90° phase shift for a wide range of single-frequency input signals. Thus, whilst it will not handle wideband input signals, it may be useful for such applications as N-path and quadrature modulation filters where the provision of variable-frequency quadrature carrier signals allows the position of the passband to be continuously altered. In practice the phas... View full abstract»

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  • Simplified model for avalanche-resonance-pumped semiconductor diodes

    Publication Year: 1969, Page(s):590 - 592
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    A simplified model for avalanche-resonance pumped semiconductor diodes is presented in terms of its voltage/current relation and its equivalent circuit. All signal levels can be handled and the compatibility with lumped or transmission line circuits will be useful for circuit modelling. Small- and large-signal examples for degenerate pumping are described. View full abstract»

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  • Radiation pattern of a lens-corrected conical scalar horn

    Publication Year: 1969, Page(s):592 - 593
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    An expression for the radiation pattern of a lens-corrected conical scalar horn is derived. Computed radiation patterns are presented for scalar-horns feeds containing planoconvex and meniscus lenses in their apertures. The patterns and beamwidths are compared with those of an uncorrected wide-angle scalar horn and an open-ended corrugated waveguide. View full abstract»

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  • Modification of the p.r.b.n. crosscorrelation method to correct for the effect of nonlinearity

    Publication Year: 1969, Page(s):594 - 595
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (241 KB)

    A 4-level test signal is formed from a 2-level pseudorandom binary sequence by replacing the zero-order hold waveform by a suitably chosen but simple 2-level waveform. By this device, pseudorandom binary crosscorrelation may be made insensitive to a nonlinear input-output path formed from a zero-memory nonlinearity followed by linear dynamics. View full abstract»

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  • Generalisation of the unstiffening process for stiff nonlinear systems

    Publication Year: 1969, Page(s):595 - 597
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (342 KB)

    It has been found that a different formulation of the unstiffening process recently described is preferable in more general applications, as it reduces the number of equations which need to be solved. View full abstract»

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  • Simple analysis method for a class of nonlinear networks of arbitrary order of complexity

    Publication Year: 1969, Page(s):597 - 598
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    The letter presents a method for determining solutions equivalent to the transfer functions of linear ladder networks extending to arbitrary nonlinear constant-k type ladders. View full abstract»

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  • Thin-film coaxial-cable equaliser

    Publication Year: 1969, Page(s):598 - 597
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (237 KB)

    A theoretical study of the matching accuracy of a thin-film coaxial-cable equaliser is presented in this letter. View full abstract»

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  • Efficient evaluation of transient response for high-order systems of wide bandwidth

    Publication Year: 1969, Page(s):599 - 601
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (346 KB)

    Inverse Laplace transforms of stiff systems can be efficiently computed provided the system is of moderate order. A process is described whereby similar efficiency can be obtained for high-order systems. View full abstract»

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  • Optimum pole positions for Laguerre-function models

    Publication Year: 1969, Page(s):601 - 602
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    When modelling a linear system with a series of Laguerre functions, the model may be optimised with respect to the pole position of the Laguerre functions. A concise proof of the optimality conditions is presented, which is much shorter and less tedious than any previous proof. View full abstract»

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  • Difference between the TM11 mode in a circular and elliptical waveguide

    Publication Year: 1969, Page(s):602 - 604
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (363 KB)

    The letter deals with the stability and field configuration of the TM11 mode in a circular and elliptical waveguide. Some numerical results illustrate the variation of the position and value of the maximum electric field in the longitudinal direction as a function of the eccentncity of the cross-section. View full abstract»

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  • Influence de la réduction de mobilite due au champ transversal sur les caractéristiques des transistors m.o.s. (Influence on the characteristics of m.o.s. transistors of the mobility reduction due to a transverse electric field

    Publication Year: 1969, Page(s):604 - 605
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (238 KB)

    La lettre analyse l'effet de la réduction de mobilité des porteurs, sous l'action du champ transversal, surles caractéristiques des transistors m.o.s. On y détermine l'expression du courant de drain en utilisant une dépendence hyperbolique entre la mobilité et le champ transversal. Cette expression est en bonne concordance avec les résultats expérimentaux. Les méthodes de détermination d... View full abstract»

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  • Erratum: Comment on efficient method for the calculation of first- and second-order network sensitivities

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (89 KB)

    First Page of the Article
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Aims & Scope

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