Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 15, Issue 18, 30 August 1979
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Volume 15, Issue 18
30 August 1979
Simplified fext calculations
- Author(s): R.V. McLachlan
- Source: Electronics Letters, Volume 15, Issue 18, page: 545 –545
- DOI: 10.1049/el:19790391
- Type: Article
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p.
545
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The minimum value of far-end crosstalk attenuation (FEXTA) occurs for a disturbing-pair loss of 1 Neper with uncorrelated coupling and 0.5 Neper with correlated coupling. This information can greatly simplify assessing the far-end crosstalk performance of telemetry and similar transmission systems.
Floating ideal inductor with one d.v.c.c.s.
- Author(s): D. Patranabis and A.N. Paul
- Source: Electronics Letters, Volume 15, Issue 18, p. 545 –546
- DOI: 10.1049/el:19790392
- Type: Article
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–546
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A floating-ideal-inductor realisation scheme with one d.v.c.c.s., two amplifiers and a grounded capacitor is presented. It is also shown that, from this scheme, a grounded-capacitor/three-amplifier floating-ideal-inductor realisation scheme can be easily derived.
Optimisation of backscatter using the concept of complex characteristic polarisations
- Author(s): S.H.W. Simpson and B. Chambers
- Source: Electronics Letters, Volume 15, Issue 18, p. 547 –548
- DOI: 10.1049/el:19790393
- Type: Article
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–548
(2)
A remote sensing technique based upon the measurement of three complex reflection coefficients is shown to facilitate the characterisation of a scattering surface, such as terrain, as a function of the polarisation of the incident wave. An experimental microwave scatterometer is described, together with experimental results from terrain which suggest that optimum scattering conditions may be produced when the incident wave has an appropriate characterstic polarisation.
Compact helium speech unscrambler using charge-transfer devices
- Author(s): M.A. Jack ; A.D. Milne ; L.E. Virr
- Source: Electronics Letters, Volume 15, Issue 18, p. 548 –550
- DOI: 10.1049/el:19790394
- Type: Article
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–550
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Helium speech is the term commonly used for the distorted speech uttered by deep-sea divers breathing in a helium/oxygen mixture. Present unscrambler designs use pitch synchronous time-expansion signal processing with digital storage. The compact unscrambler reported here has been configured using analogue charge-transfer devices for waveform storage and c.m.o.s. digital circuitry for control logic as a precursor to development of the whole system as a single integrated circuit. The compact unscrambler itself is shown to offer distinct engineering and operational advantages.
Splice loss evaluation by means of the back-scattering technique
- Author(s): B. Costa ; F. Esposto ; C. D'orio ; P. Morra
- Source: Electronics Letters, Volume 15, Issue 18, p. 550 –551
- DOI: 10.1049/el:19790395
- Type: Article
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–551
(2)
The results of a detailed experimental analysis on joint loss measurements by the back-scattering method are presented. A comparison with more usual insertion-loss technique is performed. High sensitivity and accuracy are found when measuring very similar fibres; a suitable procedure is indicated for measuring slightly different fibres.
Two-dimensional variable f.i.r. bandpass filters
- Author(s): S.S. Ahuja
- Source: Electronics Letters, Volume 15, Issue 18, p. 551 –553
- DOI: 10.1049/el:19790396
- Type: Article
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–553
(3)
In this letter the cosine transformation is extended to the design of constant-centre-frequency/variable-bandwidth and constant-bandwidth/variable-centre-frequency circularly symmetric 2D f.i.r. bandpass digital filters.
Effects of laser irradiation of GaAs observed by d.l.t.s.
- Author(s): N.G. Emerson and B.J. Sealy
- Source: Electronics Letters, Volume 15, Issue 18, p. 553 –554
- DOI: 10.1049/el:19790397
- Type: Article
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553
–554
(2)
A Q-switched ruby laser has been used to heat-treat vapourphase-epitaxial (v.p.e.) GaAs. The characteristic A-centre, a deep trapping level at 0.83 eV, is removed using a laser pulse of energy density 0.3 J cm−2. Trapping levels are observed using deep-level transient spectroscopy (d.l.t.s.).
New representation for the current in a horizontal wire above ground
- Author(s): M.P. Carpentier and A.F. Dos Santos
- Source: Electronics Letters, Volume 15, Issue 18, p. 554 –556
- DOI: 10.1049/el:19790398
- Type: Article
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–556
(3)
A new approximate formula is given for the current in a horizontal wire above ground. This formula, which is more accurate than previous ones, involves contributions from both proper and improper modes.
Reply: New representation for the current in a horizontal wire above ground
- Author(s): R.G. Olsen and D.C. Chang
- Source: Electronics Letters, Volume 15, Issue 18, p. 556 –557
- DOI: 10.1049/el:19790399
- Type: Article
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–557
(2)
New adaptive equaliser with infinite impulse response
- Author(s): Y.I. Jin
- Source: Electronics Letters, Volume 15, Issue 18, p. 557 –558
- DOI: 10.1049/el:19790400
- Type: Article
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p.
557
–558
(2)
A new adaptive equaliser with an infinite impulse response (i.i.r.) which is implemented with a least-mean-square-error (l.m.s.e.) algorithm is described. The approximation of an ideal impulse response function by a linear combination of exponential functions is used in its design, with some advantage in its performance.
Higher-mode cutoff in elliptical dielectric waveguides
- Author(s): J.R. Cozens and R.B. Dyott
- Source: Electronics Letters, Volume 15, Issue 18, p. 558 –559
- DOI: 10.1049/el:19790401
- Type: Article
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558
–559
(2)
The conditions for higher-mode cutoff in dielectric wave-guides of elliptical cross-section are derived. A table of values of the waveguide parameter V at higher-mode cutoff is given together with a curve showing the variation with ellipticity from circular to slab guide.
Boundedness properties of nonlinear multivariable feedback systems
- Author(s): D.P. Atherton and D.H. Owens
- Source: Electronics Letters, Volume 15, Issue 18, p. 559 –560
- DOI: 10.1049/el:19790402
- Type: Article
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p.
559
–560
(2)
A boundedness theorem is derived for a commonly encountered class of memoryless nonlinearities in multivariable feedback systems. The result can be useful when absolute stability cannot be proved or when investigating the existence of limit cycles.
Simple formulas for jitter accumulation in a chain of regenerative repeaters in optical-fibre transmission systems
- Author(s): U. Mengali and G. Pirani
- Source: Electronics Letters, Volume 15, Issue 18, p. 561 –562
- DOI: 10.1049/el:19790403
- Type: Article
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p.
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–562
(2)
Simple formulas are derived for evaluating the timing-jitter accumulation in a chain of regenerative repeaters for optical-fibre transmissions. The timing circuit in each repeater is modelled as a phase-locked loop. An example of the use of these formulas is reported with reference to a 140 Mbit/s transmission system.
Ku- and K-band internally matched high-power GaAs f.e.t. amplifiers
- Author(s): Jun'ichi Sone and Yoichiro Takayama
- Source: Electronics Letters, Volume 15, Issue 18, p. 562 –564
- DOI: 10.1049/el:19790404
- Type: Article
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–564
(3)
Internal-matching techniques, using lumped-element capacitors fabricated on high dielectric ceramics, have been developed for high power GaAs f.e.t.s in Ku- and K-bands. The developed internally matched high-power f.e.t. amplifier modules have exhibited 1.9 W power output with 4 dB associated gain at 14 GHz and 1.25 W power output with 3 dB associated gain at 18 GHz.
Feasibility of focused microwave array system for tumour irradiation
- Author(s): A.P. Anderson ; M. Melek ; B.H. Brown
- Source: Electronics Letters, Volume 15, Issue 18, p. 564 –565
- DOI: 10.1049/el:19790405
- Type: Article
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p.
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–565
(2)
Radiofrequency hyperthermia has been used for treatment of cancer and relies on reduced blood flow through the tumour. Microwave-induced hyperthermia is proposed by means of an orthogonal-array system which produces a focal region for spatially selective internal heating within an attenuating medium.
Attenuation and depolarisation data obtained on 12 GHz satellite-Earth paths at four Canadian locations
- Author(s): Pey-Kee Lau and Jeremy Allnutt
- Source: Electronics Letters, Volume 15, Issue 18, p. 565 –567
- DOI: 10.1049/el:19790406
- Type: Article
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p.
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–567
(3)
A preliminary result of the Communication Technology Satellite (CTS) propagation experiment carried out in Canada is presented. These results of 11.7 GHz band were obtained in 1978 while the CTS was located at 116 degrees W longitude.
Conversion gain of m.e.s.f.e.t. drain mixers
- Author(s): Günther Begemann and Arne Jacob
- Source: Electronics Letters, Volume 15, Issue 18, p. 567 –568
- DOI: 10.1049/el:19790407
- Type: Article
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–568
(2)
A theoretical analysis of the gain properties of m.e.s.f.e.t. drain mixers is presented. The m.e.s.f.e.t. model includes the nonlinearity of both the transconductance and the drain resistance. For a special case, a simple analytical expression for the gain is given. Numerical results for a typical example are briefly presented as an illustration.
New canonic single-resistance-controlled sinusoidal oscillator using a single current conveyor
- Author(s): Raj Senani
- Source: Electronics Letters, Volume 15, Issue 18, p. 568 –569
- DOI: 10.1049/el:19790408
- Type: Article
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p.
568
–569
(2)
A novel second-order oscillator is proposed which employs a single second-generation current conveyor, only two capacitors and five resistors, and facilitates independent control of frequency of oscillation through a single grounded resistor, without affecting the condition of oscillation.
Optical-fibre flowmeter
- Author(s): B. Culshaw and M.J. Hutchings
- Source: Electronics Letters, Volume 15, Issue 18, p. 569 –571
- DOI: 10.1049/el:19790409
- Type: Article
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p.
569
–571
(3)
A technique is described for the measurement of fluid flow using an optical-fibre transducer. The flowmeter has no mechanical moving parts and causes no pressure drop in the liquid stream. The optical system and the detection electronics are intrinsically very simple. Results from a prototype meter are given, and improvements in this design, particularly in the turbulence characteristics of the meter tube, should improve measurement accuracy to an estimated ±5%.
Another method for the RC active simulation of doubly-terminated LC ladder filters
- Author(s): M.S. Piedade
- Source: Electronics Letters, Volume 15, Issue 18, p. 571 –572
- DOI: 10.1049/el:19790410
- Type: Article
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–572
(2)
A new method is presented for the active RC simulation of doubly-terminated LC ladder filters containing floating inductors. The resulting active filters have a reduced number of capacitors and operational amplifiers, and exhibit a good high-frequency performance.
Alloyed planar diodes in indium antimonide
- Author(s): K. Riedling ; F. Olcaytug ; W. Fallmann
- Source: Electronics Letters, Volume 15, Issue 18, p. 572 –573
- DOI: 10.1049/el:19790411
- Type: Article
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572
–573
(2)
A low-temperature planar technology for InSb is presented that is suitable for maintaining high carrier mobilities. Thin film contacts made of evaporated indium and electrolytically deposited cadmium were alloyed under stearic acid using silicon nitride as a mask layer. Process temperatures did not exceed 250°C.
C.C.D. adaptive filter employing parallel coefficient updating
- Author(s): N.R. Massey ; P.M. Grant ; J. Mavor
- Source: Electronics Letters, Volume 15, Issue 18, p. 573 –575
- DOI: 10.1049/el:19790412
- Type: Article
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–575
(3)
A charge-coupled-device adaptive transversal filter is described which incorporates parallel tap-weight coefficient updating. The prototype filter was based on a clipped least-mean-squares algorithm with digital tap-weight storage. The design of an 8-tap prototype filter capable of being clocked between 1 and 100 kHz is reported and its performance assessed by testing its ability to separate two sinusoidal waveforms.
Inverse Routh-Hurwitz array solution to the inverse stability problem
- Author(s): A.C. Tsoi
- Source: Electronics Letters, Volume 15, Issue 18, p. 575 –576
- DOI: 10.1049/el:19790413
- Type: Article
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p.
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–576
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In this letter, a general method will be given whereby the inverse Routh-Hurwitz array may be constructed. This gives a solution to the inverse stability problem as first posed by Jarominek.
Ion-implanted GaAs X-band power f.e.t.s
- Author(s): F.H. Doerbeck ; H.M. Macksey ; G.E. Brehm ; W.R. Frensley
- Source: Electronics Letters, Volume 15, Issue 18, p. 576 –578
- DOI: 10.1049/el:19790414
- Type: Article
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–578
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Active layers for GaAs power f.e.t.s have been produced by Si implantation into Cr-doped substrates followed by a simple proximity-annealing technique. Devices fabricated on these layers have up to 1.05 W/mm gate width at 10 GHz. This performance is equal to that of epitaxial devices.
Microwave gain from an n-channel enhancement-mode InP m.i.s.f.e.t.
- Author(s): L.G. Meiners ; D.L. Lile ; D.A. Collins
- Source: Electronics Letters, Volume 15, Issue 18, page: 578 –578
- DOI: 10.1049/el:19790415
- Type: Article
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A power gain of 14 dB at 1 GHz has been demonstrated in an enhancement-mode m.i.s.f.e.t. constructed on an Fe-doped semi-insulating InP substrate. The same device also exhibits well behaved gain characteristics at low frequencies.
Erratum: P.I.D. equivalent of optimal regulator
- Author(s): S. Mukhopadhyay
- Source: Electronics Letters, Volume 15, Issue 18, page: 578 –578
- DOI: 10.1049/el:19790416
- Type: Article
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