Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 6, Issue 20, 1 October 1970
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Volume 6, Issue 20
1 October 1970
Stabilisation of Gunn oscillations in layered semiconductor structures
- Author(s): P. Gueret
- Source: Electronics Letters, Volume 6, Issue 20, p. 637 –638
- DOI: 10.1049/el:19700441
- Type: Article
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2-stream interaction between an active GaAs diode and a passive biased semiconductor is shown to reduce the growth rate of a space-charge wave by a factor proportional to the difference of carrier drift velocities in the two interacting semiconductors. This mechanism offers a possible way for stabilising Gunn oscillators with large n0L products.
New types of modulation processes using limiters
- Author(s): J.D. Daley and J.R. James
- Source: Electronics Letters, Volume 6, Issue 20, p. 638 –640
- DOI: 10.1049/el:19700442
- Type: Article
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The infinite peak clipping of two unequal-amplitude sinusoids is analysed to show that the action is linearised if one of the sinusoids is dominant. An examination of the resulting harmonic and intermodulation components suggests two possible uses for this circuit arrangement; these being as an alternative to conventional balanced modulators and demodulators, and secondly, as a pulse modulation system. The likely advantages of these new circuits are briefly discussed.
Baseband pulse shaping
- Author(s): S.C. Kak
- Source: Electronics Letters, Volume 6, Issue 20, p. 640 –641
- DOI: 10.1049/el:19700443
- Type: Article
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The use of the Gaussian pulse amplitude modulated with a sin x/x waveform for baseband pulse shaping is suggested. This produces less intersymbol interference than in the commonly used procedure employing gradual roll off in the frequency domain. Further the frequency characteristic also falls off as fast as exp (−x2) asymptotically.
Offline correction of microwave-network-analyser reflection-coefficient errors
- Author(s): J.D. Last and S.T. Smith
- Source: Electronics Letters, Volume 6, Issue 20, p. 641 –642
- DOI: 10.1049/el:19700444
- Type: Article
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This program has been developed to correct certain errors arising in the use of microwave-network-analyser systems. In using a network analyser to measure the reflection coefficient, errors arise from imperfections in directional couplers, source and other mismatches and crosstalk and inaccurate tracking between test and reference channels. This program facilitates calibration of the system and corrects the measurement data obtained. The use of error correction can also extend the useful frequency range of the analyser. In addition, the program can modify data for various reference planes and has facilities for graphical output on a Smith-chart display. The program was designed to run on an ICL 4100 series computer with incremental plotter, magnetic tape handlers and paper-tape station, in addition to card reader and line-printer.
Improvements in multispeed reluctance motors
- Author(s): P.J. Lawrenson and S.R. Murthy Vamaraju
- Source: Electronics Letters, Volume 6, Issue 20, p. 642 –643
- DOI: 10.1049/el:19700445
- Type: Article
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New forms of segmented-rotors for multispeed reluctance motors are described. The magnetic circuits of the rotors allow both the segments and the channels (in the segments) to be of differing spans with differing angular spacings. The performance of the new designs is greatly superior to that of the earlier symmetrical designs, particularly for operation with stator pole numbers which are a multiple of three.
Impairment of noise immunity of digital monolithic integrated circuits caused by supply-line and earth-line current spikes in conjunction with coaxial-cable connections
- Author(s): M. Abdel-Latif and M.J.O. Strutt
- Source: Electronics Letters, Volume 6, Issue 20, p. 643 –645
- DOI: 10.1049/el:19700446
- Type: Article
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Voltage fluctuations generated on the common supply and earth lines of a digital system are caused mainly by capacitances of interconnecting coaxial cables and the self inductances of these common lines. This impairment of noise immunity can be eliminated by the addition of proper integrated m.o.s. capacitances.
Theory of the thin-oxide m.n.o.s. memory transistor
- Author(s): C. Svensson and I. Lundström
- Source: Electronics Letters, Volume 6, Issue 20, p. 645 –647
- DOI: 10.1049/el:19700447
- Type: Article
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A general model for the transient behaviour of m.i.s. memory transistors is presented. The model is applied to a practical memory transistor which has an insulator layer consisting of 500–1000 Å silicon nitride on 15–25 Å silicon dioxide. The properties of this device are calculated and are shown to agree with experimental data.
Solution of distributed-parameter problems using numerical inversion of Laplace transforms
- Author(s): V. Zakian and G.K. Smith
- Source: Electronics Letters, Volume 6, Issue 20, p. 647 –648
- DOI: 10.1049/el:19700448
- Type: Article
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Certain distributed-parameter systems characterised by partial differential equations, when analysed by Laplace-transform methods, give rise to nonrational transforms which are intractable by conventional techniques of inversion. These problems are easily solved by a numerical-inversion technique given recently. The technique is used to study the behaviour of an oven which has a feedback controller to regulate its temperature.
Analogue gating in multichannel detection devices
- Author(s): F.P. Küpper and J.M.J. De Ruiter
- Source: Electronics Letters, Volume 6, Issue 20, p. 648 –649
- DOI: 10.1049/el:19700449
- Type: Article
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10 or more light pulses of about 30 ns width (laser light scattering) are conveniently registered by a time-sequential arrangement of the signals from the light detectors. Analogue gates provide mutual isolation and prevent the addition of high-frequency noise components.
Measurement of negative conductance of a Gunn device
- Author(s): R.B. Smith and B.J. Downing
- Source: Electronics Letters, Volume 6, Issue 20, p. 649 –651
- DOI: 10.1049/el:19700450
- Type: Article
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Measurements are reported of the frequency dependence of the maximum negative conductance which can be realised by a Gunn device operating as an oscillator in the delayed-domain mode. A theoretical value is found for the frequency at which the maximum negative conductance reaches a peak value, and this is found to be in good agreement with the measurements.
Simple capacitance transducer for instantaneous angular-velocity measurement
- Author(s): B.E. Jones
- Source: Electronics Letters, Volume 6, Issue 20, p. 651 –652
- DOI: 10.1049/el:19700451
- Type: Article
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To measure accurately the instantaneous angular velocity of a low-inertia stepper motor, a simple noncontact capacitance transducer has been developed. The capacitance has a value linear1 related to angular displacement of the motor shaft. The basic design is discussed, and construction details and practical result are give.
Tree generation without duplication
- Author(s): R.W. Fry and V.K. Aatre
- Source: Electronics Letters, Volume 6, Issue 20, p. 652 –654
- DOI: 10.1049/el:19700452
- Type: Article
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The set of trees of a graph arc generated by forming a starting tree and then finding replacements for the branches in this tree. These replacements are found by searching the rows of the corresponding cutset matrix for nonzero entries and then using column-clearing operation. Certain rules to prevent duplication of trees are also formulated.
Diffraction spreading of surface waves on LiNbO3
- Author(s): R.D. Weglein ; M.E. Pedinoff ; H. Winston
- Source: Electronics Letters, Volume 6, Issue 20, p. 654 –656
- DOI: 10.1049/el:19700453
- Type: Article
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The far-field diffraction spreading of surface acoustic waves on y cut LiNbO3, has been measured in two directions. For propagation along z, the beam is much narrower than for the isotropic case, and along a direction at 21.9° to z it is broader; both observations are in semiquantitative agreement with an analysis based on a parabolic approximation for the velocity surface in the neighbourhood of these directions.
Rational delay functions based on continued-fraction expansion of ex
- Author(s): V. Pongparit and S.B. Park
- Source: Electronics Letters, Volume 6, Issue 20, p. 656 –658
- DOI: 10.1049/el:19700454
- Type: Article
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Rational approximations to the ideal delay function e−ts (where τ is the delay time, and s is the complex frequency) based on the continued fraction expansion (c.f.e.) of ex are studied in both the frequency and the time domains. Comparisons with other approximations show that the new approximations have the least ratios of rise time to delay time for the same order of the function and within certain tolerances of overshoot and undershoot in the step response.
Realisation of a class of A matrix
- Author(s): M. Lal and H. Singh
- Source: Electronics Letters, Volume 6, Issue 20, p. 658 –659
- DOI: 10.1049/el:19700455
- Type: Article
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A realisation procedure is discussed for the A matrix of a class of RLC networks in which there is no coupling between link resistances and tree-branch conductances. This procedure, although applicable to a restricted class of networks, is simpler than that given by Nordgren and Tokad. It is illustrated with the help of an example considered previously.
Erratum: Efficiency enhancement in the conversion into the magnetostatic mode utilising a specially designed coiled transducer
- Author(s): T. Ohta and N. Ogasawara
- Source: Electronics Letters, Volume 6, Issue 20, page: 660 –660
- DOI: 10.1049/el:19700456
- Type: Article
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