Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 16, 10 August 1972
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Volume 8, Issue 16
10 August 1972
Large-time-bandwidth-product surface-wave pulse compressor employing reflective gratings
- Author(s): R.C. Williamson and Henry I. Smith
- Source: Electronics Letters, Volume 8, Issue 16, p. 401 –402
- DOI: 10.1049/el:19720292
- Type: Article
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A novel dispersive delay line with a time-bandwidth product in excess of 1500 has been developed. The device uses the reflection of elastic surface waves from sputter-etched gratings on LiNbO3. This reflective-array compressor is relatively free of the spurious signals which limit the performance of inter-digital transducer arrays.
Surface-state density at the (hydrogen-chloride) oxide-silicon interface
- Author(s): M. Severi and G. Soncini
- Source: Electronics Letters, Volume 8, Issue 16, p. 402 –404
- DOI: 10.1049/el:19720293
- Type: Article
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The addition of small amounts of gaseous hydrogen chloride into the dry-oxygen-gas stream during thermal oxidation has been found to reduce by one order of magnitude the surface-state density at the silicon-dioxide-silicon interface. Effects of silicon orientation, low-temperature annealing and hydrogen-chloride concentration within the oxidising atmosphere have been investigated by using the quasistatic technique.
Locating an oscillating magnetic dipole in the earth
- Author(s): James R. Wait
- Source: Electronics Letters, Volume 8, Issue 16, p. 404 –406
- DOI: 10.1049/el:19720294
- Type: Article
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The merits of a horizontal magnetic dipole in a source-location scheme are considered. The results have possible applications in locating trapped miners following disasters.
External-Q factor measurement of an oscillator by the injection locking ellipse
- Author(s): F. Diamand and M. Armand
- Source: Electronics Letters, Volume 8, Issue 16, p. 406 –407
- DOI: 10.1049/el:19720295
- Type: Article
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The usual relation between the external Q factor and the locking bandwidth of an oscillator is not valid when the device reactance is nonlinear. The correct value of the Q factor is then obtained by using a certain frequency interval that can be easily read on the locking ellipse in this relation, rather than the locking bandwidth.
Low-attenuation characteristics of dielectric-lined waveguide
- Author(s): P.J.B. Clarricoats ; A.M.B. Al-Hariri ; A.D. Olver ; K.B. Chan
- Source: Electronics Letters, Volume 8, Issue 16, p. 407 –409
- DOI: 10.1049/el:19720296
- Type: Article
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A low-attenuation characteristic of the EH11 mode in dielectric-lined circular waveguide is explained in a manner similar to that reported by Carlin and D'Agostino for TM0m modes. It is shown that the longitudinal magnetic field of the hybrid mode has a low intensity at the wall in the regime of low attenuation.
Spectra of a frequency-shift-keyed signal amplitude-modulated by a sinusoidal wave
- Author(s): C.K. Chan and T.T. Tjhung
- Source: Electronics Letters, Volume 8, Issue 16, p. 409 –411
- DOI: 10.1049/el:19720297
- Type: Article
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The spectra of a continuous-phase frequency-shift-keyed signal amplitude-modulated by a sinusoidal wave at half the bit-rate frequency are derived. Some numerical evaluations of the power cumulative distribution as a function of the frequency-modulation and amplitude-modulation indices are presented.
Suboptimal estimation of the parameters of discrete systems in the presence of correlated noise
- Author(s): P.N. James ; P. Souter ; D.C. Dixon
- Source: Electronics Letters, Volume 8, Issue 16, p. 411 –412
- DOI: 10.1049/el:19720298
- Type: Article
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Using an unbiased objective function and a fast algorithm which employs an iterative least-squares technique, consistent estimates are obtained for the parameters of a linear difference equation which describes a system having an output corrupted by correlated noise. The method is applied to a simulated process and compared with the generalised least-squares method.
Characteristic equations of optimal linear multivariable control systems
- Author(s): P.D. Roberts and R. Osko
- Source: Electronics Letters, Volume 8, Issue 16, p. 412 –413
- DOI: 10.1049/el:19720299
- Type: Article
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A simple derivation of the frequency-domain characteristic equation of the optimal linear multivariable control system is given. The equation is obtained from Pontryagin's maximum principle and is compared with alternative expressions given in the literature.
Performance improvement of amplitude-constrained minimum-variance controller by minimising sum of variance
- Author(s): R.F. Brown
- Source: Electronics Letters, Volume 8, Issue 16, p. 413 –414
- DOI: 10.1049/el:19720300
- Type: Article
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Saturation of the input transducer is a frequently occurring difficulty with minimum-variance controllers and results in the variance being significantly greater than in the unconstrained case. Therefore, it is desirable to decrease the likelihood of saturation. In this letter, this is achieved by deriving a control law which minimises the variance over a time interval.
Radiation characteristics of dielectric cones
- Author(s): C.E.R.C. Salema and P.J.B. Clarricoats
- Source: Electronics Letters, Volume 8, Issue 16, p. 414 –416
- DOI: 10.1049/el:19720301
- Type: Article
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Theoretical and experimental radiation patterns are favourably compared for a dielectric-cone feed made from polythene with a semiflare angle of 25°. The patterns are also shown to be very similar to those of a conical corrugated horn of the same flare angle. Theoretical results for other angles are also presented.
Evaluation of the determinants of cascade-connected Coates and Mason graphs
- Author(s): I. Cahit and R. Cahit
- Source: Electronics Letters, Volume 8, Issue 16, p. 416 –418
- DOI: 10.1049/el:19720302
- Type: Article
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New formulas for evaluating the determinants of cascade connected flowgraphs and signal flowgraphs in terms of subgraph determinants are presented. Illustrative examples are also given.
Some results of testing m.o.s. transistors at elevated temperatures
- Author(s): Jerzy F. Kolodziejski
- Source: Electronics Letters, Volume 8, Issue 16, p. 418 –419
- DOI: 10.1049/el:19720303
- Type: Article
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Some results of testing p channel enhancement-type m.o.s. transistors with negative gate bias at elevated temperatures are given. Such a treatment causes an initial temporary decrease in the threshold voltage Vth, followed by a significant increase of this parameter which is dependent on bias, temperature and treatment time. It is thought that these changes in Vth and changes in other device parameters are due to high-temperature polarisation and then depolarisation of the phosphosilicate-glass stabilisation layer, as well as the slow trapping in silicon dioxide and creation of new surface states at the silicon-silicon-dioxide interface.
Small-signal admittance of the insulator-n type-gallium-arsenide interface region
- Author(s): W. Quast
- Source: Electronics Letters, Volume 8, Issue 16, p. 419 –421
- DOI: 10.1049/el:19720304
- Type: Article
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Capacitance/voltage characteristics of metal-insulator-semiconductor n type gallium arsenide differ considerably from the normal behaviour as observed with silicon. A trap model for the gallium-arsenide-surface region is proposed. The frequency dependence of the derived small-signal capacitance and conductance is verified by measurements.
Use of a sampling oscilloscope for velocity measurements and frequency comparisons of impulse acoustic surface waves
- Author(s): G. Sagnes ; G. Bastide ; G. Cambon ; M. Rouzeyre
- Source: Electronics Letters, Volume 8, Issue 16, p. 421 –422
- DOI: 10.1049/el:19720305
- Type: Article
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A simple method of phase-shift and velocity measurements of impulse surface waves in an active delay line is related. Using Lissajous's displays on a sampling oscilloscope, accurate measurements are performed, even though the transmitted signal is disturbed by r.f. leakage, echoes or spurious modes. The same technique is applied to the frequency determination of a convoluted signal in a nonlinear device.
Critical comparison of Niki's method for finding the optimum overrelaxation factor with Carré's method
- Author(s): D.E. Radley ; D. Dirmikis ; A.B. Birtles
- Source: Electronics Letters, Volume 8, Issue 16, p. 422 –424
- DOI: 10.1049/el:19720306
- Type: Article
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Several deficiencies of Niki's method are pointed out. Results are compared with those of Carré's method, showing the latter to be superior in every case.
Numerical computation of the phase velocity of current on an infinite helix
- Author(s): D.C. Wynn and C.T. Carson
- Source: Electronics Letters, Volume 8, Issue 16, p. 424 –425
- DOI: 10.1049/el:19720307
- Type: Article
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A numerical method is given for the determination of the propagation velocity of current on a thin-wire helix. The tangential electric field is set to zero at a point on the conductor surface and the propagation constant is found by solving the resultant integral equation by digital computer using a direct-search technique.
New bipolar analogue multiplier
- Author(s): K.G. Schlotzhauer and T.R. Viswanathan
- Source: Electronics Letters, Volume 8, Issue 16, p. 425 –427
- DOI: 10.1049/el:19720308
- Type: Article
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This letter describes a new logarithmic-addition bipolar analogue multiplier possessing an inherently high accuracy (0.35%) and a tolerance of moderate device betas without requiring an operational amplifier. The single-ended design precludes the need for complex driving circuitry. Single-and 4-quadrant operations are discussed and experimental results are presented.
High-power microwave amplifier using IMPATT diodes
- Author(s): A.S. Bains
- Source: Electronics Letters, Volume 8, Issue 16, p. 427 –428
- DOI: 10.1049/el:19720309
- Type: Article
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A single multichip IMPATT diode, operating in the unconditional amplifying mode, has been used as a reflection amplifier in the 6–8 GHz range. C.W. power-output levels of 4.0 W have been achieved with a stable reflection-amplifier circuit, using two multichip diodes in separate cavities coupled to a single circulator through an airstrip hybrid. The gain of the amplifier is 6 dB, with 250 MHz (−1 dB) bandwidth.
Erratum: Level-shift compensation in m.o.s. bucket-brigade circuits operated in an analogue mode
- Author(s): W.J. Butler ; M.B. Barron ; B. Kurz
- Source: Electronics Letters, Volume 8, Issue 16, page: 428 –428
- DOI: 10.1049/el:19720310
- Type: Article
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