Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 23, 13 November 1969
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Volume 5, Issue 23
13 November 1969
Self modulation at gigahertz frequencies of a diode laser coupled to an external cavity
- Author(s): R.F. Broom
- Source: Electronics Letters, Volume 5, Issue 23, p. 571 –572
- DOI: 10.1049/el:19690430
- Type: Article
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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.
Electromagnetic scattering by a helical sheath
- Author(s): E. Borchi
- Source: Electronics Letters, Volume 5, Issue 23, p. 572 –574
- DOI: 10.1049/el:19690431
- Type: Article
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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.
First-order correction for zero-order hold distortion in sampled-data filters
- Author(s): R.K.P. Galpin
- Source: Electronics Letters, Volume 5, Issue 23, p. 574 –575
- DOI: 10.1049/el:19690432
- Type: Article
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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.
Current-mode circuits for ternary-logic realisation
- Author(s): H. Dunderdale
- Source: Electronics Letters, Volume 5, Issue 23, p. 575 –577
- DOI: 10.1049/el:19690433
- Type: Article
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High-speed current-mode circuits for the realisation of ternary combinational logic expressions are described.
Algorithms for majority-logic check equations of maximal-length codes
- Author(s): N.Q. Duc and L.V. Skattebol
- Source: Electronics Letters, Volume 5, Issue 23, p. 577 –579
- DOI: 10.1049/el:19690434
- Type: Article
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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.
Digital communication in fading channels using incoherent carriers
- Author(s): J. Das and S.C. Bose
- Source: Electronics Letters, Volume 5, Issue 23, p. 579 –581
- DOI: 10.1049/el:19690435
- Type: Article
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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 (c.n.r.) and channel separation (for multiplexed systems) are also shown.
Equivalent circuit for the acoustoelectric oscillator
- Author(s): F.G. Marshall
- Source: Electronics Letters, Volume 5, Issue 23, p. 581 –583
- DOI: 10.1049/el:19690436
- Type: Article
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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.
Low-frequency operation of avalanche diodes under large-signal conditions
- Author(s): B. Culshaw
- Source: Electronics Letters, Volume 5, Issue 23, p. 583 –585
- DOI: 10.1049/el:19690437
- Type: Article
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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.
Unsymmetrical bandpass and bandstop digital filters
- Author(s): W. Winkelnkemper
- Source: Electronics Letters, Volume 5, Issue 23, p. 585 –586
- DOI: 10.1049/el:19690438
- Type: Article
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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.
Mismatched linear active 2-ports
- Author(s): S. Venkateswaran and V.P. Namjoshi
- Source: Electronics Letters, Volume 5, Issue 23, p. 586 –588
- DOI: 10.1049/el:19690439
- Type: Article
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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%.
Controlled wide-range quadrature phase-shift network
- Author(s): A.K.H. Miller
- Source: Electronics Letters, Volume 5, Issue 23, p. 588 –589
- DOI: 10.1049/el:19690440
- Type: Article
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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 phase shift through the system can be maintained at 90° ±0.15° for a 10: 1 range of signal frequencies.
Simplified model for avalanche-resonance-pumped semiconductor diodes
- Author(s): B. Hoefflinger ; F. Zappert ; C.P. Snapp
- Source: Electronics Letters, Volume 5, Issue 23, p. 590 –592
- DOI: 10.1049/el:19690441
- Type: Article
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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.
Radiation pattern of a lens-corrected conical scalar horn
- Author(s): P.J.B. Clarricoats and P.K. Saha
- Source: Electronics Letters, Volume 5, Issue 23, p. 592 –593
- DOI: 10.1049/el:19690442
- Type: Article
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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.
Modification of the p.r.b.n. crosscorrelation method to correct for the effect of nonlinearity
- Author(s): R.F. Brown
- Source: Electronics Letters, Volume 5, Issue 23, p. 594 –595
- DOI: 10.1049/el:19690443
- Type: Article
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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.
Generalisation of the unstiffening process for stiff nonlinear systems
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 23, p. 595 –597
- DOI: 10.1049/el:19690444
- Type: Article
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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.
Simple analysis method for a class of nonlinear networks of arbitrary order of complexity
- Author(s): A.G.J. Holt and C. Nightingale
- Source: Electronics Letters, Volume 5, Issue 23, p. 597 –598
- DOI: 10.1049/el:19690445
- Type: Article
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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.
Thin-film coaxial-cable equaliser
- Author(s): I.W. Stanley and T.J. Burslem
- Source: Electronics Letters, Volume 5, Issue 23, p. 598 –599
- DOI: 10.1049/el:19690446
- Type: Article
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A theoretical study of the matching accuracy of a thin-film coaxial-cable equaliser is presented in this letter.
Efficient evaluation of transient response for high-order systems of wide bandwidth
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 23, p. 599 –601
- DOI: 10.1049/el:19690447
- Type: Article
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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.
Optimum pole positions for Laguerre-function models
- Author(s): J.J. King and T. O'canainn
- Source: Electronics Letters, Volume 5, Issue 23, p. 601 –602
- DOI: 10.1049/el:19690448
- Type: Article
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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.
Difference between the TM11 mode in a circular and elliptical waveguide
- Author(s): J.G. Kretzschmar
- Source: Electronics Letters, Volume 5, Issue 23, p. 602 –604
- DOI: 10.1049/el:19690449
- Type: Article
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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.
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
- Author(s): P. Rossel
- Source: Electronics Letters, Volume 5, Issue 23, p. 604 –605
- DOI: 10.1049/el:19690450
- Type: Article
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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 des parametrés intervenant dans la relation IO(VG.VD) sont exposees.The letter deals with the effect of the reduction of the carrier mobility on the characteristics of an m.o.s. transistor when a transverse field is applied. The expression for the drain current is developed by the use of a hyperbolic relation between the mobility and the transverse field, and gives good agreement with the experiment. The determination of the parameters used in the IO(VG.VD) relation is presented.
Erratum: Comment on efficient method for the calculation of first- and second-order network sensitivities
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 23, page: 606 –606
- DOI: 10.1049/el:19690451
- Type: Article
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