Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 18, 5 September 1974
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Volume 10, Issue 18
5 September 1974
Reply to ‘Comment on Low-frequency noise in incandescent filaments’
- Author(s): E.J.P. May and H.M. Aniagyei
- Source: Electronics Letters, Volume 10, Issue 18, page: 369 –369
- DOI: 10.1049/el:19740292
- Type: Article
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p.
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(1)
Acoustic-surface-wave properties of Bi12SiO20 and related compounds
- Author(s): R.G. Pratt ; G. Simpson ; C.W. O'Connor
- Source: Electronics Letters, Volume 10, Issue 18, p. 369 –371
- DOI: 10.1049/el:19740293
- Type: Article
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p.
369
–371
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Surface-wave velocities and electromechanical-coupling coefficients on the three principal planes of Bi12SiO20 are presented as a function of the propagation direction. The measured values show that Bi12SiO20 is a more useful material for acoustic-surface-wave devices than the better known Bi12GeO20. It has a higher electromechanical-coupling coefficient, so that devices made with it have a lower untuned insertion loss.
Bias-dependent oscillations in 10 μm-long transferred-electron oscillators
- Author(s): H.L. Grubin
- Source: Electronics Letters, Volume 10, Issue 18, p. 371 –372
- DOI: 10.1049/el:19740294
- Type: Article
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p.
371
–372
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Computer simulations show that a transferred-electron oscillator sustaining X band circuit-controlled relaxation oscillations will, in the same circuit, but at higher bias levels, shift to a space-charge dominated oscillation, where the terminal voltage always exceeds threshold.
New method for producing ideal metal-semiconductor ohmic contacts
- Author(s): T. Sebestyen ; H. Hartnagel ; L.H. Herron
- Source: Electronics Letters, Volume 10, Issue 18, p. 372 –373
- DOI: 10.1049/el:19740295
- Type: Article
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p.
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–373
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A new understanding of ohmic-contact alloying in terms of liquid-epitaxy processes has led to improved contact fabrication by using a slow alloying cycle with an As overpressure chamber. A conveniently wide range of As pressures is possible when Ga is deposited together with the other metals.
Current/voltage relations in punchthrough transistors
- Author(s): P.J. Ward and K.D. Perkins
- Source: Electronics Letters, Volume 10, Issue 18, p. 374 –375
- DOI: 10.1049/el:19740296
- Type: Article
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p.
374
–375
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Observations of punchthrough in narrow-base (≃0.1 μm) n-p-n transistors are reported that do not conform to conventional theory. A general theory of punchthrough current/voltage relations is developed that explains the experimental results.
Comment on ‘Picosecond mode delays in gradient-refractive-index fibres’
- Author(s): R.A. Steinberg
- Source: Electronics Letters, Volume 10, Issue 18, p. 375 –376
- DOI: 10.1049/el:19740297
- Type: Article
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p.
375
–376
(2)
Direct simultaneous displacement and velocity measurement by a single noncontacting capacitance transducer
- Author(s): B.E. Jones and A. Behich
- Source: Electronics Letters, Volume 10, Issue 18, p. 376 –377
- DOI: 10.1049/el:19740298
- Type: Article
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p.
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–377
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To allow control of a linear induction actuator, a single non-contacting capacitance transducer has been used to provide directly simultaneous displacement and velocity signals. Isolation between signals is obtained by using a high-frequency carrier for the displacement measurement and a noncarrier charge-modulation method for the velocity measurement.
Tracking sensitivity: an efficient algorithm for linear nonreciprocal circuits
- Author(s): K.-H. Leung and R. Spence
- Source: Electronics Letters, Volume 10, Issue 18, p. 377 –378
- DOI: 10.1049/el:19740299
- Type: Article
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p.
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–378
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For the frequency-domain response of linear nonreciprocal circuits, an algorithm for computing component tracking-sensitivity has been devised. Rapid exploration of the effect is permitted by the very limited calculation associated with each value of the global variable. e.g. temperature, following an initial calculation common to all values of the global variable.
Generation of reflection-coefficient standards of any value by means of a 3-port coaxial junction at microwave frequencies
- Author(s): D. Woods
- Source: Electronics Letters, Volume 10, Issue 18, p. 379 –380
- DOI: 10.1049/el:19740300
- Type: Article
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p.
379
–380
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A simple method is described for generating standards of reflection coefficient of any value by means of a 3-port coaxial junction, two air-dielectric lines and a matched load at frequencies where λ/4 lines can be realised.
Modifications of Tarmy-Ghausi active filter
- Author(s): J. Mulawka and M. Bialko
- Source: Electronics Letters, Volume 10, Issue 18, p. 380 –381
- DOI: 10.1049/el:19740301
- Type: Article
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p.
380
–381
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In the Tarmy-Ghausi active filter, a realisation of a summing amplifier plays an important role with respect to the Q-sensitivity of the transfer function. Here, some small sensitivity summing-amplifier configurations for this filter are presented. Examples of modified Tarmy-Ghausi circuits are given, and their sensitivity properties are compared.
Class of transfer functions with finite stopband attenuation with both passband and stopband exhibiting equiripple behaviour
- Author(s): C. Nightingale
- Source: Electronics Letters, Volume 10, Issue 18, p. 381 –383
- DOI: 10.1049/el:19740302
- Type: Article
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p.
381
–383
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A new family of transfer functions is derived in which three parameters, passband ripple, stopband attenuation and stop-band ripple, are assignable. The method uses standard elliptic transfer functions, which are transformed. Formulas relating the desired response to the prototype elliptic-transfer-function characteristics are given.
Scattering of acoustic surface waves from periodic grating filters
- Author(s): O.W. Otto and R.D. Weglein
- Source: Electronics Letters, Volume 10, Issue 18, p. 383 –384
- DOI: 10.1049/el:19740303
- Type: Article
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p.
383
–384
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New data are presented on the scattering of the z-propagating Rayleigh wave on y-cut LiNbO3 by a metallic grating into the x-propagating Rayleigh wave, a pseudo-surface-wave, and bulk shear waves. Estimates of the magnitudes of the scattering coefficients are given
Milliwatt calorimeter for the 90–140 GHz waveguide band
- Author(s): N.J. Keen
- Source: Electronics Letters, Volume 10, Issue 18, p. 384 –385
- DOI: 10.1049/el:19740304
- Type: Article
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p.
384
–385
(2)
A calorimeter with settling time of less than 30s has been constructed for the 90–140 GHz waveguide band. The calorimeter partially compensates for losses in its waveguide section by sensing the heat generated in the waveguide. The operating power range is 1 to 100 mW, and the absolute precision is less than 4% for powers ≥10 mW.
Relationship between feedback and the transfer-function matrix of a multivariable system
- Author(s): R.V. patel
- Source: Electronics Letters, Volume 10, Issue 18, p. 386 –387
- DOI: 10.1049/el:19740305
- Type: Article
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p.
386
–387
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The effect of unconstrained output feedback on the transfer-function matrix of a linear multivariable system is studied and expressions are obtained that relate corresponding elements of the closed-loop and open-loop transfer-function matrices. Some interesting results are derived from these expressions.
Ideal frequency modulator
- Author(s): J.O. Voorman
- Source: Electronics Letters, Volume 10, Issue 18, p. 387 –388
- DOI: 10.1049/el:19740306
- Type: Article
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p.
387
–388
(2)
A ideal frequency modulator is described. This modulator principle is based on a conjunctor oscillator.
Canonical RLC synthesis for a class of immittance functions
- Author(s): S. Tirtoprodjo
- Source: Electronics Letters, Volume 10, Issue 18, p. 388 –389
- DOI: 10.1049/el:19740307
- Type: Article
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p.
388
–389
(2)
The partial-fraction expansion of functions with real, simple poles generally yields positive real (p.r.) and non-p.r. terms. Sufficient conditions are derived for the p.r. terms to be able to compensate for the non-p.r. terms in a specific way, such that the outcome represents a RLC canonically realisable immittance.
Binary codes with disjoint codebooks and mutual Hamming distance
- Author(s): R.M.F. Goodman
- Source: Electronics Letters, Volume 10, Issue 18, p. 390 –391
- DOI: 10.1049/el:19740308
- Type: Article
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p.
390
–391
(2)
Equal-length linear binary block error-control codes with disjoint codebooks and mutual Hamming distance are considered. A method of constructing pairs of these disjoint codes from known cyclic codes, and determining their mutual distance, is described. Some sets of length-15 cyclic codes are tabulated.
Good block codes derived from cyclic codes
- Author(s): P. Pire
- Source: Electronics Letters, Volume 10, Issue 18, p. 391 –392
- DOI: 10.1049/el:19740309
- Type: Article
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p.
391
–392
(2)
By combining irreducible cyclic codes, we obtain good quasicyclic or extended quasicyclic codes. Some of these improve on the lower bound of Helgert and Stinaff.
Erratum: Plug-in fibre-to-fibre coupler
- Author(s): M.L. Dakss and A. Bridger
- Source: Electronics Letters, Volume 10, Issue 18, page: 392 –392
- DOI: 10.1049/el:19740310
- Type: Article
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p.
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Erratum: Optimisation of digital learning networks when applied to pattern recognition of mass spectra
- Author(s): T.J. Stonham and I. Aleksander
- Source: Electronics Letters, Volume 10, Issue 18, page: 392 –392
- DOI: 10.1049/el:19740311
- Type: Article
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p.
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(1)
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