Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 9, 1 May 1969
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Volume 5, Issue 9
1 May 1969
Acoustic bulk-surface-wave transducer
- Author(s): R.F. Humphryes and E.A. Ash
- Source: Electronics Letters, Volume 5, Issue 9, p. 175 –176
- DOI: 10.1049/el:19690133
- Type: Article
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p.
175
–176
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Bulk and surface waves are strongly coupled at a corrugated surface. Experiments have demonstrated transduction losses of less than 1dB and bandwidths of 20%. Methods of implementation at high frequencies are discussed.
Use of nonuniform dielectrics on surface-wave structures
- Author(s): R.L. Gallawa and J.E. Partch
- Source: Electronics Letters, Volume 5, Issue 9, p. 177 –178
- DOI: 10.1049/el:19690134
- Type: Article
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p.
177
–178
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Glines with nonuniform dielectric regions are studied in an attempt to improve performance over that of normal Glines with uniform dielectric regions. Some improvement is predicted for the lines studied; however, the effect of the radial decay rate precludes any general conclusions concerning overall performance of such lines.
Push-pull operation of transferred-electron oscillators
- Author(s): H.J. Kuno ; J.F. Reynolds ; B.E. Berson
- Source: Electronics Letters, Volume 5, Issue 9, p. 178 –179
- DOI: 10.1049/el:19690135
- Type: Article
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p.
178
–179
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Push-pull circuit configurations for GaAs transferred-electron oscillators are described. C.W. X band and pulsed L band devices have been operated in such circuits and have shown as much as 50% increase in output power compared with the sum of the powers obtained from the individual devices.
Review and comparison of drift-correction schemes for periodic crosscorrelation
- Author(s): R.F. Brown
- Source: Electronics Letters, Volume 5, Issue 9, p. 179 –181
- DOI: 10.1049/el:19690136
- Type: Article
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p.
179
–181
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The presently available drift-correction schemes are unified and extended. As a means of comparing various schemes quantitatively, the variance of the estimate in the presence of wideband noise is proposed as a performance criterion.
Simple expressions for the effect of substrate doping on the gain of m.o.s.t.s
- Author(s): J.M. Shannon
- Source: Electronics Letters, Volume 5, Issue 9, p. 181 –182
- DOI: 10.1049/el:19690137
- Type: Article
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181
–182
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Approximate expressions have been derived for the gain falloff of an m.o.s.t. with substrate doping. The expressions compare the mutual conductance on an extrinsic substrate with that on an intrinsic substrate for criteria of equal power dissipation, channel current or gate voltage. For the first two criteria, the approximation gives agreement to within 15% over all practical substrate doping levels when substrate biasing is small. The third, however, can only be used for low and moderate doping levels. It is shown that, with moderate substrate doping, thc gain falloff is small if a criterion of constant power or channel current is used.
Criterion for mode uncoupling in oblique-incidence scattering from radially inhomogeneous cylinders
- Author(s): R.G. Parkinson
- Source: Electronics Letters, Volume 5, Issue 9, p. 182 –183
- DOI: 10.1049/el:19690138
- Type: Article
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182
–183
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It is shown that the condition for mode uncoupling is that the product μɛ is constant and has the same value inside and outside the cylinder.
Stability of p.c.m.-oscillator synchronisation systems with sampled error signals
- Author(s): M.R. Miller
- Source: Electronics Letters, Volume 5, Issue 9, p. 183 –184
- DOI: 10.1049/el:19690139
- Type: Article
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183
–184
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Previous analyses of control-system stability have approximated the p.c.m. synchronisation system to a continuous linear model. The digital nature of the equipment indicates that a sampled model is more appropriate, and it is shown that, with this model, the system gains have to be reduced. A comparison between ‘continuous’ and ‘sampled’ stability criteria is made.
Stability of bulk negative-resistance material
- Author(s): L. Lewin
- Source: Electronics Letters, Volume 5, Issue 9, p. 184 –185
- DOI: 10.1049/el:19690140
- Type: Article
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p.
184
–185
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The skin-effect limitation on an amplifier, obtained in a previous communication, is confirmed, but the amplifier is unstable beyond a critical length. The same instability mechanism discussed by Chawla and Coleman operates also in the oscillator case, but since saturation necessarily enters to limit the oscillation, it is not clear whether the full bulk of the material contributes to the output.
Electron-temperature, density and gas-temperature measurements in an argon afterglow
- Author(s): B.V. Donovan and M.C. Sexton
- Source: Electronics Letters, Volume 5, Issue 9, p. 185 –186
- DOI: 10.1049/el:19690141
- Type: Article
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p.
185
–186
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Microwave and spectroscopic methods of monitoring the time-varying density and temperature of the electrons, as well as the temperature of the neutral background gas, have been applied to an argon afterglow. Electron-ion recombination coefficients were extracted from the decay rate over the electron-density range 1013–1011cm−3, concerning which little information had previously been reported.
Efficiency peaking in red-light-emitting gallium-phosphide diodes
- Author(s): A.R. Peaker
- Source: Electronics Letters, Volume 5, Issue 9, p. 186 –187
- DOI: 10.1049/el:19690142
- Type: Article
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p.
186
–187
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Measurements of the variation of efficiency with current of gallium-phosphide diodes emitting light at 690nm have shown a consistent relationship between the peak quantum efficiency and the current at which this peak occurs. This can be related to the number of zinc-oxygen pairs in nearest-neighbour states.
Theoretical analysis of cylindrical hybrid modes in a corrugated horn
- Author(s): P.J.B. Clarricoats and P.K. Saha
- Source: Electronics Letters, Volume 5, Issue 9, p. 187 –189
- DOI: 10.1049/el:19690143
- Type: Article
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p.
187
–189
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The propagation behaviour of a corrugated cylinder is considered with particular reference to the application of such structures to hybrid-mode feeds for large reflector antennas. Results are presented which relate to the design of narrow-flare-angle horns of circular cross-section. These include the parametric dependence of a number of special points on the propagation curves. A procedure for achieving a balanced hybrid condition in the horn aperture is discussed following the proposal made by Bryant.
Analysis of spherical hybrid modes in a corrugated conical horn
- Author(s): P.J.B. Clarricoats
- Source: Electronics Letters, Volume 5, Issue 9, p. 189 –190
- DOI: 10.1049/el:19690144
- Type: Article
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p.
189
–190
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An approximate analysis of fields in a corrugated horn is considered using spherical hybrid modes. Under the special condition where the slots are about a quarter-wavelength deep, the approximations are slight in the far-field region of the horn. Solutions are presented for the lowest-order spherical hybrid modes, and a procedure is described for the determination of the horn radiation pattern. A first step in the procedure involves the calculation of the hybrid-mode field in the horn aperture. Because diffraction will be minimal in wide-angle corrugated horns, the aperture and radiation patterns should be similar when the far-field approximation applies. This feature is verified for a 120° horn making use of experimental results due to Kay.
Adaptive delta modulation
- Author(s): P.A. Wing
- Source: Electronics Letters, Volume 5, Issue 9, p. 191 –192
- DOI: 10.1049/el:19690145
- Type: Article
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p.
191
–192
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An adaptive-delta-modulation system is described taking advantage of the storage of the line digit pattern in the holding register of a delayed-delta-modulation system, to produce a significant improvement in signal/quantisation-noise ratio.
Cutoff frequency of the TMc11 mode in a hollow conducting elliptical waveguide
- Author(s): J.G. Kretzschmar
- Source: Electronics Letters, Volume 5, Issue 9, p. 192 –193
- DOI: 10.1049/el:19690146
- Type: Article
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p.
192
–193
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The cutoff wavelength of the TMc11 mode is treated as a function of the eccentricity of the elliptical cross-section. From the exact values calculated on a digital computer, an approximate formula is derived for the function qc11 = f(e) for eccentricities between 0.05 and 0.95. Over this range, the cutoff wavelength is given to an accuracy within 0.14%.
M.I.S. capacitance in heavy inversion
- Author(s): D.J. Esteve and J.J. Simonne
- Source: Electronics Letters, Volume 5, Issue 9, p. 194 –195
- DOI: 10.1049/el:19690147
- Type: Article
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p.
194
–195
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The letter deals with a theoretical analysis of the different currents originating in an m.i.s. structure for a heavy inversion region of operation, when a transient low-level electrical perturbation is applied. The expression for the generation-recombination current in the space-charge region is fairly different from that generally used; it is emphasised that the recombination rate is not constant and not equal to ni/2τn in the whole thickness of the transition zone.
Observation of faults in convertor bridges
- Author(s): C.E. Fernando
- Source: Electronics Letters, Volume 5, Issue 9, p. 195 –196
- DOI: 10.1049/el:19690148
- Type: Article
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p.
195
–196
(2)
A method of simultaneously monitoring the seven valves in a 3-phase Graetz bridge circuit is described. The d.c. smoothing-inductor voltage is observed for this purpose. It is shown that the point of failure on the voltage wave of the malfunctioning valve can be found.
Experimental evidence of transit-time effects in silicon punch-through diodes
- Author(s): D. Dascalu
- Source: Electronics Letters, Volume 5, Issue 9, p. 196 –198
- DOI: 10.1049/el:19690149
- Type: Article
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p.
196
–198
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Small-signal frequency characteristics indicating the effect of hole transit times were measured for ‘punch-through’ p–v–p silicon diodes. The transit time was sufficiently long to allow measurements in a relatively low frequency range (0.5–18MHz), thus avoiding parasitic effects. Experimental results for several operating points in the square-law region of the d.c. characteristic agree very well with the theoretical frequency characteristics.
Digital notch filters
- Author(s): A.G. Constantinides
- Source: Electronics Letters, Volume 5, Issue 9, p. 198 –199
- DOI: 10.1049/el:19690150
- Type: Article
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198
–199
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The letter deals with the special class of digital filters that possess a prescribed notch frequency. The present techniques for synthetising such filters rest on the bilinear-transformation method, where the designer is required to synthetise a continuous s plane notch filter, prewarp it, and then apply the transformation. It is shown here that notch filters can be synthetised directly into the z−1 plane.
Boundary and volume filtering of linear distributed-parameter systems
- Author(s): S.G. Tzafestas
- Source: Electronics Letters, Volume 5, Issue 9, p. 199 –200
- DOI: 10.1049/el:19690151
- Type: Article
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199
–200
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The optimal-filtering problem of linear distributed-parameter systems corrupted by boundary and/or volume stochastic disturbances is considered. The optimal filter is shown to be a generalisation of that previously derived for pure volume noise.
Resonance absorption of microwave longitudinal phonons in transversally magnetised [100] y.i.g. rods
- Author(s): P. de Santis and F. Marchetti
- Source: Electronics Letters, Volume 5, Issue 9, p. 200 –201
- DOI: 10.1049/el:19690152
- Type: Article
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200
–201
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Gigahertz-region phonons in [100] y.i.g. rods are observed to undergo resonant attenuation if a transverse magnetic bias is applied along the [110] direction. Results obtained are interpreted on the basis of a lamellar magnetic domain structure.
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