Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 13, 24 June 1976
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Volume 12, Issue 13
24 June 1976
Generation of 880 MHz surface acoustic wave by transduction from bulk wave using corrugation grating on GaAs
- Author(s): M. Yamanishi ; M. Ameda ; T. Kawamura ; N. Mikoshiba ; K. Tsubouchi
- Source: Electronics Letters, Volume 12, Issue 13, p. 317 –318
- DOI: 10.1049/el:19760243
- Type: Article
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–318
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Efficient transduction from bulk to surface waves by a holographic grating on a GaAs crystal has been demonstrated. The beam profiles for 880 MHz surface waves propagating on the GaAs were measured by an optical probing method.
Comparison of quasifeedforward- and feedback-controlled amplifier
- Author(s): K.B. Klaassen ; R.J. de Kok ; J.C.L. van Peppen
- Source: Electronics Letters, Volume 12, Issue 13, p. 318 –319
- DOI: 10.1049/el:19760244
- Type: Article
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p.
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–319
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In systems with signal-error feedforward, the recently suggested method of compensated signal takeoff can be used to extend the improvement of feedforward control to the output signal adder. A system using this quasifeedforward is compared with a feedback system consisting of similar components. The dynamic stability and the improvement obtained with both control methods are analysed.
Electric-field control in planar Gunn-effect device with Schottky-barrier anode
- Author(s): O. Wada ; S. Yanagisawa ; H. Takanashi
- Source: Electronics Letters, Volume 12, Issue 13, p. 319 –321
- DOI: 10.1049/el:19760245
- Type: Article
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–321
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The use of a Schottky-barrier anode contact has been proposed to improve the operating characteristics of a d.c.-biased planar Gunn-effect device. It has been confirmed experimentally that the high-field region appearing near the usual ohmic anode can be eliminated by using a Schottky-barrier anode.
Crystallisation phenomena of native anodic oxides for GaAs devices
- Author(s): B.L. Weiss and H.L. Hartnagel
- Source: Electronics Letters, Volume 12, Issue 13, p. 321 –322
- DOI: 10.1049/el:19760246
- Type: Article
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–322
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Results are presented which show the crystallisation processes and changes in the composition of native anodic oxides produced by annealing in a nitrogen atmosphere.
Analysis of multicomponent thin films on GaAs by anodic processes
- Author(s): A.F.A.B. El-Safti ; B.L. Weiss ; H.L. Hartnagel
- Source: Electronics Letters, Volume 12, Issue 13, p. 322 –324
- DOI: 10.1049/el:19760247
- Type: Article
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Results arc presented which show that Ge ions diffuse to the surface rather than the OH− ions diffusing into the sample during the anodisation of Ge and Al on GaAs. Anodisatiort has also been used to show the growth of GaAs during the alloying of t.f.e. ohmic contacts to GaAs.
Linear system reduction using Schwarz canonical form
- Author(s): A.M. Davidson and T.N. Lucas
- Source: Electronics Letters, Volume 12, Issue 13, page: 324 –324
- DOI: 10.1049/el:19760248
- Type: Article
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A system reduction method based on Schwarz canonical form has recently been observed to have certain moment-matching properties. By reformulating the method, these properties are proved and extended and the stability of the reduced models assessed.
Attenuation coefficient for tunnelling leaky rays in graded fibres
- Author(s): A.W. Snyder and J.D. Love
- Source: Electronics Letters, Volume 12, Issue 13, p. 324 –326
- DOI: 10.1049/el:19760249
- Type: Article
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A simple derivation is given for the attenuation coefficient of leaky rays in a graded fibre of circular cross-section, requiring only geometric-optics and plane-wave concepts in a 2-dimensional medium.
Addressing scheme for the multiplexing of complex liquid-crystal displays
- Author(s): C.J. Alder and I.A. Shanks
- Source: Electronics Letters, Volume 12, Issue 13, p. 326 –327
- DOI: 10.1049/el:19760250
- Type: Article
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–327
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A description and assessment are given of a novel technique for multiplexing cholesteric/nematic-phase-change liquid-crystal displays of high complexity (>30 rows of elements). The scheme offers some relaxation of the previously precise tolerances required to multiplex these displays at a low duty cycle.
Computation of time-domain response of URC networks
- Author(s): M. Milić and M. Gmitrović
- Source: Electronics Letters, Volume 12, Issue 13, p. 327 –328
- DOI: 10.1049/el:19760251
- Type: Article
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–328
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Computer-simulation results of the evaluation of the step response of uniformly distributed RC networks (URC networks) are presented, using Liou's procedure. The advantages of using the procedure include obviating the finding of poles of the transfer function and ease of accommodating boundary conditions, as well as good numerical control.
Design criteria for the ‘hi’ doping density in hi-lo high-efficiency impatts
- Author(s): P.A. Blakey
- Source: Electronics Letters, Volume 12, Issue 13, p. 329 –330
- DOI: 10.1049/el:19760252
- Type: Article
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–330
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The influence of the ‘hi’ doping level on the performance of hi-lo high-efficiency structures is considered. Computed results show the variations of various quantities as functions of ‘hi’-region doping density. These results enable estimates to be made of the maximum permissible ‘hi’ doping level for a range of frequencies, current densities and applications.
New complex-pole single-amplifier allpass filter with reduced active-element sensitivities
- Author(s): G. Wilson
- Source: Electronics Letters, Volume 12, Issue 13, p. 330 –331
- DOI: 10.1049/el:19760253
- Type: Article
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p.
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–331
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A new complex-pole allpass network is described which is based on the minimum-transmission properties of an RC parallel-T network. The proposed structure is compared with the canonic Deliyannis arrangement, and analytical and experimental evidence is presented which indicates an improved sensitivity to finite-amplifier-gain effects.
Multivariable parameter estimation using a 2-step least-squares estimator
- Author(s): B.A. Abaza
- Source: Electronics Letters, Volume 12, Issue 13, p. 331 –333
- DOI: 10.1049/el:19760254
- Type: Article
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–333
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A 2-step least-squares technique is extended to deal with the problem of estimating the parameters of the transfer-function matrix of a multivariable linear discrete system. The method does not require assumptions such as common dynamics and a single noise source. Results on its performance are presented.
Isolated locked hybrid junction power combiner
- Author(s): J. Nigrin
- Source: Electronics Letters, Volume 12, Issue 13, p. 333 –334
- DOI: 10.1049/el:19760255
- Type: Article
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p.
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–334
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The isolated locked hybrid junction power combiner, consisting of a single hybrid junction, appropriate phase-shifting element and circulator, combines three 1-port oscillators (one master oscillator strongly locking the other oscillators). Combiner frequency, noise and locking properties are controlled by the master oscillator, and combining efficiency close to 100%, can be achieved. The combiner can be extended in a modular fashion.
New π equivalent circuit for high-frequency bipolar transistors
- Author(s): A.H. Kwesah and M.K. McPhun
- Source: Electronics Letters, Volume 12, Issue 13, p. 334 –335
- DOI: 10.1049/el:19760256
- Type: Article
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–335
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A simplified equivalent circuit having the whole of Cob, between the base terminal and the collector junction is derived, and conditions for its validity are given. This simplification is shown to apply to integrated bipolar transistors having fr≃2.5 GHz.
Computation of group delay and its sensitivities
- Author(s): I.N. Hajj
- Source: Electronics Letters, Volume 12, Issue 13, p. 336 –337
- DOI: 10.1049/el:19760257
- Type: Article
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p.
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–337
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A method is given for the efficient computation of group delay and its sensitivities for active or passive lumped and/or distributed networks. The method is based on solving a transpose system of equations.
Dual formulation of Youla's theory of broadband matching
- Author(s): Wai-Kai Chen
- Source: Electronics Letters, Volume 12, Issue 13, p. 337 –338
- DOI: 10.1049/el:19760258
- Type: Article
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p.
337
–338
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It is shown that Youla's theory of broadband matching is equally valid in terms of the load admittance. Using this result, explicit formulas for the synthesis of an optimum broadband impedance-matching network having Butterworth power/gain characteristic of arbitrary order are presented, which reduce the design to simple arithmetic.
Conditions for jitter-free timing in a p.a.m. timing recovery circuit
- Author(s): G. Petrović
- Source: Electronics Letters, Volume 12, Issue 13, p. 338 –340
- DOI: 10.1049/el:19760259
- Type: Article
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–340
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The problem of error-free timing recovery is discussed for a p.a.m. timing recovery scheme. The general conditions were carried out by considering the timing signal as narrow-band-pass process and searching for a condition when the component of phase modulation does not exist.
Contributions of optical-waveguide manufacturing variations to joint loss
- Author(s): F.L. Thiel and D.H. Davis
- Source: Electronics Letters, Volume 12, Issue 13, p. 340 –341
- DOI: 10.1049/el:19760260
- Type: Article
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340
–341
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The contributions of manufacturing variations in optical-waveguide core diameter, numerical aperture and refractive-index profile exponent to loss in splices and connections are investigated by computer simulation. Expressions allowing predictions of loss from a knowledge of fibre population parameters are developed.
Pole sensitivity of the quadratic optimal regulator
- Author(s): Y. Bar-Ness
- Source: Electronics Letters, Volume 12, Issue 13, p. 341 –343
- DOI: 10.1049/el:19760261
- Type: Article
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–343
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A matrix associated with the quadratic optimal linear regulator and containing, as elements, the performance-index matrices is used to derive sensitivity formulas for the closed-loop poles of the system. The dependence of these poles on the performance-index matrices is established for both continuous and discrete systems.
Minimal transfer c.c.d. structures
- Author(s): L.F. Lind and W.S. Matheson
- Source: Electronics Letters, Volume 12, Issue 13, p. 343 –344
- DOI: 10.1049/el:19760262
- Type: Article
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p.
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–344
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The letter introduces a new store structure, the double binary tree, which minimises the charge loss due to intercell transfers in charge-coupled-device stores. This structure offers a significant improvement over the series-parallel-series structure (currently in use) in this respect. Modification of a design parameter converts this structure to a shift register at one extreme and a random-access store at the other. Under some design constraints, a topologically efficient configuration is possible, but, with additional constraints, it is shown that the series-parallel-series structure remains optimal.
Edge diffraction beyond a caustic
- Author(s): G.L. James ; G.T. Poulton ; A. Rifai
- Source: Electronics Letters, Volume 12, Issue 13, p. 344 –346
- DOI: 10.1049/el:19760263
- Type: Article
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–346
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A uniform edge-diffraction formulation is given when a caustic of the incident or reflected field occurs in the vicinity of the optical boundary. The solution gives consistent behaviour of the edge-diffracted field on either side of the caustic.
Low-frequency radio transmission in a circular tunnel containing a wire conductor near the wall
- Author(s): J.R. Wait and D.A. Hill
- Source: Electronics Letters, Volume 12, Issue 13, p. 346 –347
- DOI: 10.1049/el:19760264
- Type: Article
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The general theory for transmission in a circular tunnel containing a thin axial conductor is employed to calculate the attenuation rate of the propagating mode. The remarkable property is that the attenuation rate is approximately pro-portional to frequency and it does not depend critically on the wall conductivity for typical conditions.
Comment on ‘Illumination of graded-core fibres’ [and reply]
- Author(s): C. Pask ; A.W. Synder ; C.G. Someda ; M. Zoboli
- Source: Electronics Letters, Volume 12, Issue 13, p. 347 –348
- DOI: 10.1049/el:19760265
- Type: Article
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Erratum: Correction factors for the determination of optical-fibre refractive-index profiles by the near-field scanning technique
- Author(s): M.J. Adams ; D.N. Payne ; F.M.E. Sladen
- Source: Electronics Letters, Volume 12, Issue 13, page: 348 –348
- DOI: 10.1049/el:19760266
- Type: Article
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