Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 24, 28 November 1974
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Volume 10, Issue 24
28 November 1974
Normally-off m.e.s.f.e.t. with fast switching behaviour
- Author(s): E. Kohn
- Source: Electronics Letters, Volume 10, Issue 24, page: 505 –505
- DOI: 10.1049/el:19740401
- Type: Article
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Normally-off m.c.s.f.e.t.s, fabricated on an insulating GaAs substrate with a vapour-phase-grown double layer (n−/n), showed a d.c. characteristic with a good saturation range and a switching response of 35 ps risetime.
Best approximation for design of natural resonance frequencies of microwave dielectric disc resonators
- Author(s): Y. Garault and P. Guillon
- Source: Electronics Letters, Volume 10, Issue 24, p. 505 –507
- DOI: 10.1049/el:19740402
- Type: Article
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Une méthode nouvelle pour le calcul des fréquences de résonance des résonateurs diélectriques cylindriques est présentée. La condition de court-circuit magnétique imparfait appliquée successivement à toutes les parois augmente considérablement la précision. Les valeurs théoriques et expérimentales diffèrent au plus de 1%.We present a new method for efficient computation of the resonance frequencies of dielectric disc resonators. Successive applications of imperfect open-circuit boundary conditions to all walls greatly improve the accuracy for resonance frequencies. Theoretical values agree within 1% of experimental results.
Equivalent network for bridged crystal filters
- Author(s): Man Shek Lee
- Source: Electronics Letters, Volume 10, Issue 24, p. 507 –508
- DOI: 10.1049/el:19740403
- Type: Article
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An equivalent circuit for a capacitively bridged coupled resonator is described. Bridged T networks may be obtained from ladder networks by using this transformation.
High-speed electro-optic analogue-digital conversion
- Author(s): S. Wright ; I.M. Mason ; M.G.F. Wilson
- Source: Electronics Letters, Volume 10, Issue 24, p. 508 –509
- DOI: 10.1049/el:19740404
- Type: Article
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An experimental electro-optic analogue-digital convertor based on a diffraction modulator is described to illustrate the principle that direct analogue-digital conversion can be performed at high speeds with electro-optic devices.
Thin-film acousto-optic interaction in LiNbO3
- Author(s): J.M. White ; P.F. Heidrich ; E.G. Lean
- Source: Electronics Letters, Volume 10, Issue 24, p. 510 –511
- DOI: 10.1049/el:19740405
- Type: Article
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100% Bragg diffraction of guided optical waves by surface acoustic waves in metal-diffused layers in LiNbO3 substrates has been observed. The predicted efficiency, which compares favourably with experimental measurement, is shown to arise mainly from the electro-optic contribution of the electric field associated with the yz acoustic surface waves instead of the clasto-optic contribution due to the strain or from the surface ripple components.
Synthesis of acoustic-surface-wave filters using double electrodes
- Author(s): R.F. Mitchell and D.W. Parker
- Source: Electronics Letters, Volume 10, Issue 24, page: 512 –512
- DOI: 10.1049/el:19740406
- Type: Article
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An extra degree of freedom becomes available in the design of s.a.w. bandpass filters using double electrodes if the electrodes are individually weighed. This procedure also removes fundamental synthesis problems encountered with more conventional structures.
Disturbance localisation in linear time-invariant multivariable systems
- Author(s): S.L. Shah ; D.G. Fisher ; D.E. Seborg
- Source: Electronics Letters, Volume 10, Issue 24, page: 513 –513
- DOI: 10.1049/el:19740407
- Type: Article
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A simple algebraic approach is used to derive necessary and sufficient conditions for the existence of a state feedback matrix to localise disturbances and which some of the closed-loop-system eigenvectors must satisfy for disturbance localisation. This latter result provides valuable insight as to how the state feedback matrix may be synthesised.
Second-order approximation for the design of broadband couplers using nonuniform lines
- Author(s): Y. Garault and J.P. Villotte
- Source: Electronics Letters, Volume 10, Issue 24, p. 514 –515
- DOI: 10.1049/el:19740408
- Type: Article
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The purpose of the letter is to present an analytical response of asymmetric nonuniform coupled-transmission-line directional couplers in a 2nd-order approximation. It is based on the equivalence between directional couplers and even-mode nonuniform transmission lines.
Noise immunity for continuous-phase pulse-frequency modulation in the presence of low-intensity noise
- Author(s): S. Bellini and G. Tartara
- Source: Electronics Letters, Volume 10, Issue 24, p. 515 –516
- DOI: 10.1049/el:19740409
- Type: Article
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The minimum mean-square error that can be attained in demodulating a c.p.p.f.m. wave is determined for weak additive Gaussian-noise channels.
Transistor improvements using an IMPATT collector
- Author(s): A.M. Winstanley and J.E. Carroll
- Source: Electronics Letters, Volume 10, Issue 24, p. 516 –518
- DOI: 10.1049/el:19740410
- Type: Article
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Improvements in the operation of a transistor-like structure with an IMPATT collector are examined. The proposed name for the device is an IMPISTOR. For a given emitter stripewidth in a transistor-like structure, the IMPISTOR should operate at a frequency between five and ten times higher than for a normal transistor.
Acousto-optic diffraction by an acoustic surface wave in an ion-exchanged waveguide
- Author(s): M. Kondo ; Y. Ohta ; F. Saito ; H. Sasaki ; N. Chubachi ; K. Koizumi
- Source: Electronics Letters, Volume 10, Issue 24, p. 518 –519
- DOI: 10.1049/el:19740411
- Type: Article
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We have investigated acousto-optic diffraction by an acoustic surface wave generated by a ZnO-thin-film transducer in an ion-exchanged waveguide. A diffraction efficiency of 70% was obtained with 2 W of electric power.
Electrically controlled acoustic-surface-wave filters
- Author(s): M.I. Borisov ; D.V. Stojanov ; V.V. Velkov ; J.I. Burov
- Source: Electronics Letters, Volume 10, Issue 24, p. 519 –520
- DOI: 10.1049/el:19740412
- Type: Article
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The field-effect transistor is used for a linear control of the acoustic radiation of single-electrode section of the surface-wave transducer. The electrically controlled surface-wave filters and delay lines, the characteristics of which may be specified by a set of constant control voltages, are described on this basis.
Computer analysis of edge-coupled planar structures
- Author(s): R. Jansen
- Source: Electronics Letters, Volume 10, Issue 24, p. 520 –522
- DOI: 10.1049/el:19740413
- Type: Article
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Eigensolutions of the wave equation are computed for interacting multiply connected microstrip structures of arbitrary contour. This is done by the application of Galerkin's method to an integral eigenvalue equation governing the surface current density on the planar metallic configuration. Numerical examples presented concern the coupled microstrip line, concentric resonating rings and a circular disc embedded in a ring.
Multiphase oscillator and multivibrator using improved unijunction transistors
- Author(s): K. Da'koku and T. Tamama
- Source: Electronics Letters, Volume 10, Issue 24, p. 522 –523
- DOI: 10.1049/el:19740414
- Type: Article
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The properties of multiphase oscillator and multivibrator using an improved unijunction transistor, fabricated by planar technology, were investigated. The 3-phase oscillator is very useful as the transfer pulse generator for recently developed c.c.d. and p.c.d. devices.
Electron-drift-velocity measurements in silicon at high temperatures and their empirical relation to electric field
- Author(s): C. Canali ; G. Majni ; R. Minder ; G. Ottaviani
- Source: Electronics Letters, Volume 10, Issue 24, p. 523 –524
- DOI: 10.1049/el:19740415
- Type: Article
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The drift velocity of electrons in silicon has been measured over a wide range of electric fields (from 3×102 to 6×104 V/cm) at temperatures of up to 430 K. The experimental data have been fitted to a simple formula for the temperatures of interest. The mean-square deviation was, in all cases, less than 3·8%.
Erratum: Comparative performance of equal-valued-capacitor active RC structures
- Author(s): F.W. Stephenson
- Source: Electronics Letters, Volume 10, Issue 24, page: 524 –524
- DOI: 10.1049/el:19740416
- Type: Article
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