Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 23, 11 November 1976
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Volume 12, Issue 23
11 November 1976
New V-groove double-diffused m.o.s. (v.d.m.o.s.)
- Author(s): S.-Y. Yu and P. Ou-Yang
- Source: Electronics Letters, Volume 12, Issue 23, page: 605 –605
- DOI: 10.1049/el:19760461
- Type: Article
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A new V-groove double-diffused m.o.s. (v.d.m.o s.) is proposed which combines the V-groove technology and the double-diffused m.o.s. (d.m.o.s.) technology. The fabrication processes arc qualitatively described. The gate is located on the vertical V-shaped surface, and the effective channel length is controlled by the vertical-diffusion process of the double-diffusion step. The v.d.m.o.s. is expected to have a faster speed and higher production yield than the ordinary d.m.o.s.
Performance of self-oscillating GaAs m.e.s.f.e.t. mixers at X-band
- Author(s): I.D. Higgins
- Source: Electronics Letters, Volume 12, Issue 23, p. 605 –606
- DOI: 10.1049/el:19760462
- Type: Article
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A new mode of m.e.s.f.e.t. operation, the self-oscillating mixer is reported. Conversion gains of up to 2 dB at 10 GHz and noise figures as good as 15 dB have been demonstrated by using a simple circuit.
Power conservation theorem for 2-dimensional volume holograms
- Author(s): L. Solymar
- Source: Electronics Letters, Volume 12, Issue 23, p. 606 –607
- DOI: 10.1049/el:19760463
- Type: Article
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The properties of volume holograms for plane-wave incidence were discussed in detail by Kogelnik. In the present letter, Kogelnik's calculations are generalised for a 2-dimensional case when the incident waves can have arbitrary wavefronts. Coupled differential equations are derived, and it is shown that power, defined by generalising geometrical optics, is conserved.
Efficient power coupling using taper-ended multimode optical fibres
- Author(s): Takeshi Ozeki and B.S. Kawasaki
- Source: Electronics Letters, Volume 12, Issue 23, p. 607 –608
- DOI: 10.1049/el:19760464
- Type: Article
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Highly efficient power coupling of up to 97% between a d.h. laser and a multimode step-index fibre is demonstrated by employing a tapered fibre launcher. Also, it is shown theoretically that a tapered end increases the effective numerical aperture of a fibre. For a Lambertian emitter, the use of a taper launcher permits the maximum coupling efficiency allowed by the Liouville theorem.
Novel magnetic-field sensor using carrier-domain rotation: proposed device design
- Author(s): Barrie Gilbert
- Source: Electronics Letters, Volume 12, Issue 23, p. 608 –610
- DOI: 10.1049/el:19760465
- Type: Article
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–610
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A bipolar semiconductor device is described in which a mobile domain of current rotates around a circular path at a rate proportional to a magnetic field, when this is perpendicular to the planar structure, or follows the magnetic vector when this is in the same plane. Potentially high sensitivities are possible, since the response is inherently integrating; practical limitations to this are discussed.
Novel magnetic-field sensor using carrier-domain rotation: operation and practical performance
- Author(s): M.H. Manley ; G.G. Bloodworth ; Y.Z. Bahnas
- Source: Electronics Letters, Volume 12, Issue 23, p. 610 –611
- DOI: 10.1049/el:19760466
- Type: Article
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A magnetic field applied to a circular p-n-p-n structure causes rotation of a carrier domain, the localised region where bipolar-transistor action occurs. A theoretical explanation is given of device operation, including the dependence of rotation frequency on flux density. Experimental results are given for a prototype device.
Economical associative storage with universal sequential logic networks
- Author(s): M.C. Fairhurst
- Source: Electronics Letters, Volume 12, Issue 23, p. 612 –613
- DOI: 10.1049/el:19760467
- Type: Article
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A modified form of a universal sequential logic network is presented and its mechanisms of operation discussed. It is shown to have certain advantages in terms of efficiency and flexibility over a conventional universal network as a medium for associative storage.
Tangent sweep circuit
- Author(s): P.A. McGovern
- Source: Electronics Letters, Volume 12, Issue 23, p. 613 –614
- DOI: 10.1049/el:19760468
- Type: Article
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A tangent sweep circuit for application in recording of airborne i.r. line-scan data is described, which uses only low-cost components. Sweep parameters are directly related to circuit parameters, and a sweep velocity signal is available. Minor modifications give hyperbolic or hyperbolic-tangent waveforms.
Sinusoidal current-controlled oscillator
- Author(s): A.K. Bhattacharyya and T.R. Viswanathan
- Source: Electronics Letters, Volume 12, Issue 23, p. 614 –615
- DOI: 10.1049/el:19760469
- Type: Article
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A sinusoidal oscillator whose frequency is linearly related to an input control current is described. A variable inductor is realised using a fixed inductor and a variable-gain current-controlled current source. The variable inductor is then used in an LC oscillator circuit. Linear frequency variation with control current is obtained in a temperature-independent manner by using a function generator. Frequency variation over a range of 1:3 is obtainable, with a linearity of better than 1%.
Influence of nonuniform field distribution on frequency limits of GaAs field-effect transistors
- Author(s): Michael Shur
- Source: Electronics Letters, Volume 12, Issue 23, p. 615 –616
- DOI: 10.1049/el:19760470
- Type: Article
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A simple model which describes well the nonequilibrium electron transport in GaAs using the fit to the equilibrium Monte Carlo data is suggested. In the frame of this model, the cutoff-frequency/gate-length curves are calculated for uniform and nonuniform channel field distribution in GaAs f.e.t.s. The results show that the nonhomogeneity of the electric field in the channel can considerably decrease (by 30%) the maximal frequency of GaAs f.e.t.s.
Ordering the data for Lee's algorithm
- Author(s): P.L. Moran and I.R. Price
- Source: Electronics Letters, Volume 12, Issue 23, p. 617 –618
- DOI: 10.1049/el:19760471
- Type: Article
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It is shown that, when using Lee's algorithm for interconnection programs, if the order in which the tracks are routed is determined by the distance between the start and end points of each tracks, on average more paths may be placed than if the order is chosen at random.
Preliminary results of linear/circular depolarisation on a 18km, 11.6 GHz radio link
- Author(s): I.J. Dilworth and B.G. Evans
- Source: Electronics Letters, Volume 12, Issue 23, p. 618 –620
- DOI: 10.1049/el:19760472
- Type: Article
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An experiment to compare linear and circular depolarisation simultaneously on an 11.6 GHz, 18 km radio link is described. Preliminary results of both rainfall and multipath depolarisation are presented. It is concluded that, in rainfall events, circular depolarisation is worse than linear, although this is not true in all cases of multipath. Experimental results are compared with a new stochastic canting-angle model, and good agreement is obtained, especially for circular polarisation, for which the new model yields a substantial improvement.
New feedback configuration for analogue multipliers
- Author(s): E.A. Faulkner
- Source: Electronics Letters, Volume 12, Issue 23, p. 620 –621
- DOI: 10.1049/el:19760473
- Type: Article
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When an analogue multiplier is used as a modulator, the application of suitable signal-frequency feedback can result in a reduction of the sensitivity of the product term to the multiplier parameter K, so that, for instance, a change of 5% in K results in only 0.06% change in the product amplitude.
Determination of transport lags by using frequency-response tests
- Author(s): T.R. Crossley
- Source: Electronics Letters, Volume 12, Issue 23, p. 621 –622
- DOI: 10.1049/el:19760474
- Type: Article
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An algorithm for the determination of the transport lag of a pure time delay in cascade with a time-invariant linear system is developed and illustrated by an example.
Analysis of field distributions in a GaAs m.e.s.f.e.t. at large drain voltages
- Author(s): Jun'ichi Sone and Yoichiro Takayama
- Source: Electronics Letters, Volume 12, Issue 23, p. 622 –624
- DOI: 10.1049/el:19760475
- Type: Article
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Electric-field distributions and carrier-density distributions in a GaAs m.e.s.f.e.t. at large drain voltages are investigated with a new analytical model, which takes account of the electron-drift-velocity saturation with negative differential mobility and the extension of a depletion layer towards the drain electrode.
Microprocessor interfaces
- Author(s): D. Zissos and F.G. Duncan
- Source: Electronics Letters, Volume 12, Issue 23, p. 624 –625
- DOI: 10.1049/el:19760476
- Type: Article
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The letter shows that the use of frontend logic allows microprocessor interfaces to be designed systematically and simply, using logic-free channels. Their impletnentation requires no monostables, local clocks or any other form of timing signals.
Series operation of transferred-electron devices
- Author(s): M.J. Howes
- Source: Electronics Letters, Volume 12, Issue 23, p. 626 –627
- DOI: 10.1049/el:19760477
- Type: Article
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A method of obtaining efficient operation of transferred-electron oscillators is described which involves matching the device to a circuit which is well known and understood. The basic oscillator structure consists of series transferred-electron devices post mounted in a full-height waveguide cavity. The d.c. bias is derived from a single d.c. source.
Wide-range temperature/frequency convertor
- Author(s): B.Ž. Djorddjevich
- Source: Electronics Letters, Volume 12, Issue 23, p. 627 –628
- DOI: 10.1049/el:19760478
- Type: Article
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A novel wide range temperature/frequency convertor, based on comparing the current through a thermistor and the capacitor discharging current, is described. The input/output relationship is linear over a wide temperature range. The performance fitting has to be done only at the maximum temperature of the range. The convertor can be made multirange by simple modification of the circuit.
Asymmetric coupled lines in an inhomogeneous medium
- Author(s): R. Crampagne ; L. Jinich ; G. Khoo
- Source: Electronics Letters, Volume 12, Issue 23, p. 629 –630
- DOI: 10.1049/el:19760479
- Type: Article
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Up-to-date, asymmetric coupled lines in an inhomogeneous medium have been dealt with either theoretically or by making use of certain properties obtained in practice. According to certain formulas, these properties are only valid for extremely special geometrical configurations. However, we realised from the general theory, by performing numerical applications, that these properties possess an unexpected application domain: they are, in particular, valid for practically all experimental manipulations.
Wideband analyser for measurement of probability densities and distributions
- Author(s): W. Freude
- Source: Electronics Letters, Volume 12, Issue 23, p. 630 –631
- DOI: 10.1049/el:19760480
- Type: Article
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A fast window comparator transforms an input random voltage to a random series of pulses with equal amplitude. For stationary processes, the d.c. component of the pulse voltage is proportional to the probability density of the input voltage. Inaccuracies due to finite switching times are considered, together with errors dependent on the nonzero window width.
Pulse shaping by laser-excited solid-state plasmas in silicon
- Author(s): W. Platte
- Source: Electronics Letters, Volume 12, Issue 23, p. 631 –633
- DOI: 10.1049/el:19760481
- Type: Article
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A new method for d.c. or r.f. pulse shaping by laser-excited solid-state plasmas in a silicon microstrip device is described. An analysis is given to precalculate the output pulse shape for special parameter settings. Theoretical and experimental results were found to agree fairly well.
Easily decodable runlength code (e.d.r.c.) for source encoding of black-and-white facsimile pictures
- Author(s): G. Renelt
- Source: Electronics Letters, Volume 12, Issue 23, p. 633 –634
- DOI: 10.1049/el:19760482
- Type: Article
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A coding system is represented, showing some advantages with respect to reduction of redundancy of black-and-white facsimile pictures compared with well known codes, and also with respect to regularity and simple implementation. The codewords of this system can be decoded by elementary concatenation of the decoded prefix and the original suffix.
Least-squares design technique for digital Hilbert-transform filters
- Author(s): A.A. Abu El-Ata and G.D. Cain
- Source: Electronics Letters, Volume 12, Issue 23, p. 634 –636
- DOI: 10.1049/el:19760483
- Type: Article
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Discrete-time calculation of Hilbert transforms is of increasing importance in digital processing of communication signals. The technique for designing digital Hilbert filters described here makes use of the properties specific to this filter category in arriving at a simple closed-form matrix formulation. The optimality criterion utilised is that of least-squares error (l.s.e.), which results in filter error characteristics that compare reasonably well with minimax designs using the Remez exchange algorithm—achieved with considerably reduced computational burden.
Erratum: Electrical characterisation of transferred-electron devices
- Author(s): J. McBretney and M.J. Howes
- Source: Electronics Letters, Volume 12, Issue 23, page: 636 –636
- DOI: 10.1049/el:19760484
- Type: Article
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Erratum: Surface-acoustic-wave parametric amplifier
- Author(s): F.W. Smith
- Source: Electronics Letters, Volume 12, Issue 23, page: 636 –636
- DOI: 10.1049/el:19760485
- Type: Article
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Erratum: Electro-optic Y-junction modulator/switch
- Author(s): H. Sasaki and R.M. de la Rue
- Source: Electronics Letters, Volume 12, Issue 23, page: 636 –636
- DOI: 10.1049/el:19760486
- Type: Article
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Erratum: High-speed Bode- and Nichols-diagram plotter
- Author(s): G. Palmieri ; L. Spadavecchia ; C. Usai
- Source: Electronics Letters, Volume 12, Issue 23, page: 636 –636
- DOI: 10.1049/el:19760487
- Type: Article
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Erratum: 7.9–8.4 GHz GaAs m.e.s.f.e.t. amplifier
- Author(s): J. Goel and R. Camisa
- Source: Electronics Letters, Volume 12, Issue 23, page: 636 –636
- DOI: 10.1049/el:19760488
- Type: Article
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