Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 17, 23 August 1968
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Volume 4, Issue 17
23 August 1968
Ternary maps for binary functions
- Author(s): D.H. Green and P.W. Foulk
- Source: Electronics Letters, Volume 4, Issue 17, p. 343 –344
- DOI: 10.1049/el:19680270
- Type: Article
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p.
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–344
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A new map representation is presented for use in the design of binary logical circuits, in which the complete structure of the function is indicated. Based on a ternary weighting system, the map cells are easily enumerated and can be extended into a 3-dimensional form. Simplification, factorisation and fan-in design limitations can be performed by simple logical operations on selected areas of the map.
Popov-like stability criterion for a class of time-varying continuous systems
- Author(s): J.S. Krikorian and T.A. Bickart
- Source: Electronics Letters, Volume 4, Issue 17, p. 344 –346
- DOI: 10.1049/el:19680271
- Type: Article
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p.
344
–346
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Using functional-analysis methods, a Popov-like stability criterion is derived for use in the analysis of a class of time-varying control systems, consisting of a time-varying gain followed by a causal time-invariant linear convolution operator. The stability criterion provides a simple graphical means of obtaining stability information which complements the existing information for this class of systems.
Optimum source admittance for minimum noise figure of microwave transistors
- Author(s): W. Bächtold and M.J.O. Strutt
- Source: Electronics Letters, Volume 4, Issue 17, p. 346 –348
- DOI: 10.1049/el:19680272
- Type: Article
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p.
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–348
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Noise measurements of microwave transistors have shown that the optimum source admittance with respect to the minimum noise figure approaches the conjugate complex value of the transistor input admittance with increasing frequency. This fact is explained using the noise equivalent circuit of a microwave transistor.
Eliminating the effect of site reflections on radiation patterns of microwave aerials
- Author(s): T.K. Fitzsimons
- Source: Electronics Letters, Volume 4, Issue 17, p. 348 –349
- DOI: 10.1049/el:19680273
- Type: Article
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–349
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A method for revealing the effect of site reflections on aerial radiation-pattern measurements is described. The method can be used to identify the source of the reflections and also to eliminate their effects.
Relationships among coefficients of a p.r. function due to the presence of an imaginary pole
- Author(s): G. Martinelli
- Source: Electronics Letters, Volume 4, Issue 17, p. 349 –350
- DOI: 10.1049/el:19680274
- Type: Article
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–350
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Relations among coefficients of a positive-real (p.r.) function are derived using the hypothesis of functions having poles on the imaginary axis. The application of these relations to the case of a pole at zero frequency extends to any p.r. function a property recently found for a restricted class of them.
Analytical optimisation of the cascade synthesis of distributed-RC networks for sharp cutoff
- Author(s): A.G.J. Holt and P. Bowron
- Source: Electronics Letters, Volume 4, Issue 17, p. 350 –351
- DOI: 10.1049/el:19680275
- Type: Article
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p.
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–351
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An analytical treatment of the optimisation of the cascade synthesis of the four-section distributed-RC network is presented, together with computed results of the associated frequency-response-slope curves.
Canonical (phase-variable) form by signal-flow graph
- Author(s): H.J. Weaver and R.J. Leake
- Source: Electronics Letters, Volume 4, Issue 17, p. 351 –352
- DOI: 10.1049/el:19680276
- Type: Article
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In this letter, it is shown that the matrix which transforms a system to the canonical (phase-variable) form is simply the matrix of numerator coefficients of the input-state transfer function. Thus, the required transformation matrix is easily found by signal-flow-graph rules.
Application of 2-dimensional solutions of the Shockley-Poisson equation to inversion-layer m.o.s.t. devices
- Author(s): H.W. Loeb ; R. Andrew ; W. Love
- Source: Electronics Letters, Volume 4, Issue 17, p. 352 –354
- DOI: 10.1049/el:19680277
- Type: Article
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p.
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–354
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A model for inversion-layer m.o.s.t.s is outlined which avoids the usual gradual-channel approximation by the use of 2-dimensional solutions to the Shockley-Poisson and Laplace equations governing the field distribution. Computed I/V and C/V characteristics and potential-distribution; diagrams are shown for a particular device geometry.
Solution of antenna problems by Fourier-series expansion
- Author(s): H.P. Nguyen
- Source: Electronics Letters, Volume 4, Issue 17, p. 354 –355
- DOI: 10.1049/el:19680278
- Type: Article
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p.
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–355
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The difficulty in evaluating the Fourier-series expansion coefficients of the kernel of the integral equation for the current of a cylindrical antenna is shown to be tractable. Thus one can assess the extent of the applicability of the approximate kernel and solve for the current distribution of a cylindrical antenna.
Helicon diagnostic of acoustoelectric domains in InSb
- Author(s): F. Seifert
- Source: Electronics Letters, Volume 4, Issue 17, p. 356 –357
- DOI: 10.1049/el:19680279
- Type: Article
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–357
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In long samples of nInSb showing coherent acoustoelectric oscillations at 77°K, helicon transmission at 35GHz indicates a carrier-depleted travelling domain near the cathode. Further down stream, low-mobility carriers are generated by breakdown and accumulate in a stationary domain near the anode. Shorter samples exhibit distributed domains which could explain transverse breakdown.
Waves in semiconductors with nonconstant mobility
- Author(s): K. Bløtekjær
- Source: Electronics Letters, Volume 4, Issue 17, p. 357 –358
- DOI: 10.1049/el:19680280
- Type: Article
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p.
357
–358
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It is pointed out that the usual assumption of field-dependent mobility is incorrect when diffusion is included in the current equation. In general, the mobility depends on the carrier temperature, which should be included as a separate variable. However, at low frequencies and long wavelengths, the carrier temperature, and hence the mobility, may be taken as local and instantaneous functions of the average carrier velocity, but not of the electric field. This modification is shown to have important implications on the small-signal stability.
Analytic test for absolute stability
- Author(s): D. Šiljak
- Source: Electronics Letters, Volume 4, Issue 17, p. 358 –359
- DOI: 10.1049/el:19680281
- Type: Article
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p.
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–359
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A simple numerical procedure is proposed, which uses the Routh test to determine absolute stability.
Modified theory of the current/voltage relation in silicon p–n junctions
- Author(s): E.A. Faulkner and M.J. Buckingham
- Source: Electronics Letters, Volume 4, Issue 17, p. 359 –360
- DOI: 10.1049/el:19680282
- Type: Article
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p.
359
–360
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If the theory of Sah, Noyce and Shockley is modified by assuming the recombination centres to be nonuniformly distributed, a current/voltage relation can be obtained in the form I ∝ exp (eV/mkT), where m lies between 1 and 2.
Stable s.e.c. target for television camera tubes
- Author(s): D. McMullan and G.O. Towler
- Source: Electronics Letters, Volume 4, Issue 17, p. 360 –362
- DOI: 10.1049/el:19680283
- Type: Article
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p.
360
–362
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Various aspects of the overload signal stability of s.e.c. targets, formed from good and poor secondary-emitting materials, are considered. It is shown that a target consisting of two layers can be made to be inherently stable to signal overload, while still having a high gain.
Microwave silicon Schottky-barrier field-effect transistor
- Author(s): K.E. Drangeid ; R. Jaggi ; S. Middelhoek ; TH. Mohr ; A. Moser ; G. Sasso ; R. Sommerhalder ; P. Wolf
- Source: Electronics Letters, Volume 4, Issue 17, p. 362 –363
- DOI: 10.1049/el:19680284
- Type: Article
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p.
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–363
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Schottky-barrier field-effect transistors have been realised in silicon epitaxial films on high-resistivity silicon substrates. The 1 μm wide gates are produced by projection-masking techniques. The maximum transconductances observed are 42 mA/V per mm gate length; the maximum frequency of oscillation fmax was 8 GHz.
Two methods of asynchronous data compression
- Author(s): R. McCaughern ; A.M. Rosie ; F.C. Monds
- Source: Electronics Letters, Volume 4, Issue 17, p. 363 –364
- DOI: 10.1049/el:19680285
- Type: Article
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p.
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–364
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Two new asynchronous data-compression techniques are described. These involve picking out peaks of the signal in one case, and peaks together with certain other important points of slope variation, in the second case. Signal reconstruction is effected by joining these points by straight lines.
Forced oscillations in an oscillating circuit utilising nonlinear capacitance
- Author(s): A.Y. Spasov
- Source: Electronics Letters, Volume 4, Issue 17, p. 365 –366
- DOI: 10.1049/el:19680286
- Type: Article
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p.
365
–366
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This letter deals with forced oscillations in an oscillating circuit with nonlinear capacitance. The method in Reference 6 is used, which does not put limitations on the amplitude of the oscillations or on the degree of nonlinearity in the circuit. The resonance characteristic and the conditions for monostable and bistable régimes of the circuit oscillations are examined.
Test of the thermal-noise hypothesis in m.o.s.f.e.t.s
- Author(s): H.E. Halladay and A. van der Ziel
- Source: Electronics Letters, Volume 4, Issue 17, p. 366 –367
- DOI: 10.1049/el:19680287
- Type: Article
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p.
366
–367
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Evidence is given that, for m.o.s.f.e.t.s, another source o noise besides thermal noise must be operating in the conducting channel.
Modal analysis of irregular terrain effects in radio propagation and the ray interpretation
- Author(s): J.R. Wait
- Source: Electronics Letters, Volume 4, Issue 17, p. 367 –368
- DOI: 10.1049/el:19680288
- Type: Article
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p.
367
–368
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Radio propagation over an idealised terrain obstacle is analysed by modal analysis. The 2-dimensional model is a cylindrical hill with a surmounted knife-edge obstacle. It is indicated that the results may be interpreted from a ray-optical viewpoint.
Cascade synthesis of a multivariable transfer matrix
- Author(s): Y. Kamp and J. Neirynck
- Source: Electronics Letters, Volume 4, Issue 17, p. 369 –370
- DOI: 10.1049/el:19680289
- Type: Article
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p.
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The necessary and sufficient conditions are established under which a multivariable transfer matrix can be synthetised as a cascade connection of lossless noncommensurate transmission lines. It is proved that, for this particular structure, the transmittance defines a unique reflectance.
Erratum: Sensitivity analysis in computer-aided design of linear circuits
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 4, Issue 17, page: 370 –370
- DOI: 10.1049/el:19680290
- Type: Article
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