Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 6, Issue 14, 9 July 1970
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Volume 6, Issue 14
9 July 1970
Additional doping in epitaxial silicon underlying a radio-frequency glow-discharge-deposited silicon-nitride layer
- Author(s): U. Günther and W. Quast
- Source: Electronics Letters, Volume 6, Issue 14, p. 425 –426
- DOI: 10.1049/el:19700298
- Type: Article
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p.
425
–426
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A doping increase in epitaxial silicon under an r.f. glow-discharge-deposited silicon-nitride layer was observed using the m.i.s. capacitance. Experimental results leading to an interpretation are given.
Elastic waves in a liquid layer with different upper and lower elastic layers
- Author(s): J. Wilkinson and C.D.W. Wilkinson
- Source: Electronics Letters, Volume 6, Issue 14, p. 426 –428
- DOI: 10.1049/el:19700299
- Type: Article
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p.
426
–428
(3)
A theoretical study of acoustic propagation in a fluid layer between two solid layers of different elastic properties is discussed. A selection of materials suitable for a pulse-compression filter is reported.
Digital networks which adapt by scanning and growth
- Author(s): R. Baker
- Source: Electronics Letters, Volume 6, Issue 14, p. 428 –430
- DOI: 10.1049/el:19700300
- Type: Article
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p.
428
–430
(3)
An adaptive-logic network is tested on a simulated routing problem. A dual adaptive process is proposed; adaptation of the network logic elements is used to find solutions of the routing problem, and then the size of the network is increased adaptively, to increase the number of such solutions found.
Spin-acoustic Love-type surface wave in a layered geometry
- Author(s): J.P. Parekh
- Source: Electronics Letters, Volume 6, Issue 14, p. 430 –432
- DOI: 10.1049/el:19700301
- Type: Article
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–432
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The letter describes the drastic modifications that occur in the spin-acoustic Love-type surface wave when the ferrite substrate is mass-loaded with a nonmagnetic elastic layer.
Approach for heat sinks in monolithic microwave integrated circuits
- Author(s): A.D. Sutherland
- Source: Electronics Letters, Volume 6, Issue 14, page: 432 –432
- DOI: 10.1049/el:19700302
- Type: Article
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p.
432
(1)
A planar electrode, placed at the symmetry plane of the odd mode of coupled microstrip, is proposed as a means for heat-sinking active devices in monolithic microwave integrated circuits.
Mode charts for elliptical resonant cavities
- Author(s): J.G. Kretzschmar
- Source: Electronics Letters, Volume 6, Issue 14, p. 432 –434
- DOI: 10.1049/el:19700303
- Type: Article
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p.
432
–434
(3)
The letter presents the necessary formulas and graphs for drawing mode charts for cylindrical cavities with elliptical cross-section.
Experimental observation of magnetostatic modes in a y.i.g. slab
- Author(s): J.D. Adam ; G.A. Bennett ; J. Wilkinson
- Source: Electronics Letters, Volume 6, Issue 14, p. 434 –436
- DOI: 10.1049/el:19700304
- Type: Article
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–436
(3)
The letter describes experiments performed on magnetostatic-wave propagation, in a transversely magnetised single-crystal plate of yttrium iron garnet at 3.9 GHz. Both surface-and volume-mode resonances were observed and are identified with theory.
Microwave generation by InP 3-level transferred-electron oscillators
- Author(s): D. Colliver ; C. Hilsum ; B.D. Joyce ; J.R. Morgan ; H.D. Rees ; J.R. Knight
- Source: Electronics Letters, Volume 6, Issue 14, page: 436 –436
- DOI: 10.1049/el:19700305
- Type: Article
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436
(1)
Preliminary measurements of the oscillator performance of InP transferred-electron devices are reported. Power has been obtained at frequencies up to 14.5 GHz. The highest efficiency obtained to date is 7% at 8.5 GHz.
Piezoelectric coupling coefficient of interdigital Rayleigh-wave transducers
- Author(s): M. Redwood and R.F. Milsom
- Source: Electronics Letters, Volume 6, Issue 14, page: 437 –437
- DOI: 10.1049/el:19700306
- Type: Article
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437
(1)
The letter describes the theoretical dependence of the piezoelectric coupling coefficient and capacitance of an interdigital Rayleigh-wave transducer on the ratio electrode-width/gap-between-electrodes.
New formula for the signal-flow graph reduction
- Author(s): J. Čajka
- Source: Electronics Letters, Volume 6, Issue 14, p. 437 –438
- DOI: 10.1049/el:19700307
- Type: Article
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p.
437
–438
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A new formula for the branch-gain computation of an equivalent signal-flow graph with reduced nodes is presented. This formula enables one to simplify a signal-flow graph by reducing an arbitrary number of nodes in one operation.
Microstrip TRAPATT oscillator
- Author(s): W.J. Chudobiak
- Source: Electronics Letters, Volume 6, Issue 14, p. 438 –439
- DOI: 10.1049/el:19700308
- Type: Article
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–439
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Experimental results obtained using a commercially available pvn diode in the TRAPATT mode in a microstrip resonator are given. It is shown that the oscillation frequency is defined easily in terms of a single circuit parameter, and that the diode performance agrees very well with that predicted by recently published analytical models.
Measurement of transition displacement in magnetic recording
- Author(s): F.A. Bagwadia and B.W. Kington
- Source: Electronics Letters, Volume 6, Issue 14, p. 439 –440
- DOI: 10.1049/el:19700309
- Type: Article
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p.
439
–440
(2)
A simulation of the magnetic-recording process shows that the magnetic transition is displaced relative to the transducer gap. This displacement has been measured by a simple technique using unipolar write currents. The implications on packing density are pointed out.
Properties of digital bandpasses obtained by convolution approximation for zero frequency
- Author(s): R. Vích
- Source: Electronics Letters, Volume 6, Issue 14, p. 440 –442
- DOI: 10.1049/el:19700310
- Type: Article
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440
–442
(3)
It is shown how to construct transfer functions of digital filters by means of numerical solution of a certain integral equation, the result of which is the response of a continuous filter to an input signal. For bandpasses with zero transmission for zero frequency this method preserves this zero also for the corresponding digital filter.
Approximation in digital-filter synthesis based on time-response invariance
- Author(s): R. Vích
- Source: Electronics Letters, Volume 6, Issue 14, p. 442 –444
- DOI: 10.1049/el:19700311
- Type: Article
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442
–444
(3)
It is shown how to construct transfer functions of digital filters simulating the behaviour of a continuous filter on the principle of the invariance of the response to an input signal of the type tk. Some properties of these transfer functions are discussed.
Approximate transfer functions for multivariable systems
- Author(s): R.M. Luntz
- Source: Electronics Letters, Volume 6, Issue 14, p. 444 –445
- DOI: 10.1049/el:19700312
- Type: Article
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444
–445
(2)
An approximation, valid over a limited region of the s plane, is given to a single path in a multivariable system. The inference of system instability from instability of this approximate transfer function is discussed, and it is shown that it is not sufficient for the approximation to be valid over a region of the real-frequency axis alone. This point is demonstrated by an example.
Transient response of a tunnel-diode trigger for linearly varying current pulses
- Author(s): S.L. Sarnot and A.B. Bhattacharyya
- Source: Electronics Letters, Volume 6, Issue 14, p. 445 –447
- DOI: 10.1049/el:19700313
- Type: Article
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–447
(3)
The pertinent forward and reverse transient characteristics of a tunnel diode for a ramp input are analytically investigated. A comparison with the results of a step input shows that the slope of the trigger pulse greatly affects the initial development of the process. The results for a linear piecewise approximation are also presented to estimate the deviation from the actual results.
Sampling theorem in Walsh-Fourier analysis
- Author(s): S.C. Kak
- Source: Electronics Letters, Volume 6, Issue 14, p. 447 –448
- DOI: 10.1049/el:19700314
- Type: Article
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p.
447
–448
(2)
A sampling theorem for sequency-limited functions is proved. It is shown that the reconstruction procedure is trivially simple when the signal is sampled at a rate 2Z, where Z is of the form 2k, k integer, equal to, or greater than, the sequency bandwidth in zeros/s. Harmuth's contention that the rate 2Z is sufficient for any Z is thus shown to be invalid for this type of reconstruction.
Simple graphical method for calculating the efficiency of bulk negative-resistance microwave oscillators
- Author(s): C. Hilsum
- Source: Electronics Letters, Volume 6, Issue 14, p. 448 –449
- DOI: 10.1049/el:19700315
- Type: Article
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448
–449
(2)
A graphical method is given for calculating the efficiency of a bulk negative-resistance microwave oscillator. It is shown that, for a square-wave r.f. signal, InP 3-level oscillators should have an efficiency of over 20% at fields only twice threshold, and In0.2Ga0.8Sb oscillators should give an efficiency of over 35%
Further properties of minimal indices
- Author(s): H.H. Rosenbrock
- Source: Electronics Letters, Volume 6, Issue 14, page: 450 –450
- DOI: 10.1049/el:19700316
- Type: Article
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450
(1)
Some further results are given which emphasise the importance of minimal indices in the structure of multivariable systems.
Matrix approach to steady-state analysis of invertor-fed induction motors
- Author(s): W. Charlton
- Source: Electronics Letters, Volume 6, Issue 14, p. 451 –452
- DOI: 10.1049/el:19700317
- Type: Article
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451
–452
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The output voltage of a static invertor is frequently a piecewise-constant periodic waveform. For such cases, and using the properties of the transition matrix, a method is presented for determining the steady-state current waveform.
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