Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 9, 4 May 1972
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 8, Issue 9
4 May 1972
Experimental study of the correlation of f.m. and l.f. noise in Gunn oscillators
- Author(s): A. de Cacqueray ; G. Blasquez ; J. Graffeuil
- Source: Electronics Letters, Volume 8, Issue 9, p. 217 –218
- DOI: 10.1049/el:19720157
- Type: Article
- + Show details - Hide details
-
p.
217
–218
(2)
Measurements of the correlation of l.f. noise current and frequency fluctuations of Gunn oscillations have been made at several frequencies from 0.1 to 50 kHz. It appears that correlation of the frequency-noise with the flicker-noise current component is very small, but that correlation with the generation-recombination noise component is important.
Simple algorithm for determining the existence of a linear graph from a given edge matrix
- Author(s): S.Y. Wong
- Source: Electronics Letters, Volume 8, Issue 9, p. 218 –220
- DOI: 10.1049/el:19720158
- Type: Article
- + Show details - Hide details
-
p.
218
–220
(3)
In this letter, a simple algorithm for determining the existence of a linear graph from a given edge matrix is given. The algorithm not only provides a means of determining the existence of a linear graph, but also suggests ways by which the given edge matrix must be modified to enable a graph to exist.
Propagation characteristics of the pseudo-Rayleigh mode of the ridge guide for acoustic surface waves
- Author(s): R.C.M. Li ; H.L. Bertoni ; A.A. Oliner ; S. Markman
- Source: Electronics Letters, Volume 8, Issue 9, p. 220 –221
- DOI: 10.1049/el:19720159
- Type: Article
- + Show details - Hide details
-
p.
220
–221
(2)
An approximate but simple dispersion relation is derived for the pseudo-Rayleigh mode of the ridge waveguide. The wave is essentially nondispersive and its phase velocity is slightly lower than that of the Rayleigh wave.
Fundamental modelling of cylindrical-geometry bipolar transistors
- Author(s): J.A.G. Slatter
- Source: Electronics Letters, Volume 8, Issue 9, p. 222 –223
- DOI: 10.1049/el:19720160
- Type: Article
- + Show details - Hide details
-
p.
222
–223
(2)
Fundamental modelling programs which calculate the properties of planar-geometry bipolar transistors can be used to calculate the properties of cylindrical-geometry bipolar transistors by a transformation of co-ordinates.
Equivalence of RC active networks
- Author(s): P. Bowron and G. Wilson
- Source: Electronics Letters, Volume 8, Issue 9, p. 223 –224
- DOI: 10.1049/el:19720161
- Type: Article
- + Show details - Hide details
-
p.
223
–224
(2)
The equivalent selectivity and sensitivity performances of the Sallen-Key and Deliyannis RC active networks are demonstrated. It is shown that the equivalence only extends to the Rauch circuit in the case of infinite amplifier gain.
Numerical time-dependent transistor-analysis algorithm
- Author(s): P. Dubock and C. Jesshope
- Source: Electronics Letters, Volume 8, Issue 9, p. 224 –225
- DOI: 10.1049/el:19720162
- Type: Article
- + Show details - Hide details
-
p.
224
–225
(2)
An algorithm that is useful in principle for analysing arbritray semiconductor devices under transient conditions is given. The algorithm is a logical extension of a popular d.c-analysis method. Results of the application of the algorithm to a switching transient in a 1-dimensional high-frequency transistor are presented.
Leakage currents of m.o.s. devices under surface-depletion conditions
- Author(s): R.A. Stuart and W. Eccleston
- Source: Electronics Letters, Volume 8, Issue 9, p. 225 –227
- DOI: 10.1049/el:19720163
- Type: Article
- + Show details - Hide details
-
p.
225
–227
(3)
It is found that the drain current of m.o.s.t. devices depends exponentially on gate voltage over a wide range of current when the surface of the device is depleted. An explanation of this effect is given. The results show that low-current measurements of this type for a variety of substrate bias conditions can provide information on the density of midgap states and the amount of impurity segregation in practical structures.
Adaptive statistical encoding of d.p.c.m.-coded videotelephone signals
- Author(s): J.L. Hullett and J.K. Craick
- Source: Electronics Letters, Volume 8, Issue 9, p. 227 –228
- DOI: 10.1049/el:19720164
- Type: Article
- + Show details - Hide details
-
p.
227
–228
(2)
Adaptive statistical encoding of d.p.c.m.-coded video-telephone signals is considered. The need for an adaptive statistical encoder to operate on short-term batch statistics is explained and the effect on the bit rate of limiting the number of codes employed by the statistical encoder is reported.
Convolution with magnetostatic waves in a y.i.g. rod
- Author(s): J.D. Adam ; J.H. Collins ; J.M. Owens
- Source: Electronics Letters, Volume 8, Issue 9, p. 229 –230
- DOI: 10.1049/el:19720165
- Type: Article
- + Show details - Hide details
-
p.
229
–230
(2)
Mixing of oppositely directed magnetostatic waves has been demonstrated in an axially magnetised y.i.g. rod. Using both single and double pulses, convolution has been achieved at 1275 MHz. Measurements and preliminary theory indicate a substantially greater bilinearity factor than that obtainable with devices currently available.
Dielectric-waveguide discontinuities
- Author(s): G.A. Hockham and A.B. Sharpe
- Source: Electronics Letters, Volume 8, Issue 9, p. 230 –231
- DOI: 10.1049/el:19720166
- Type: Article
- + Show details - Hide details
-
p.
230
–231
(2)
The discontinuity between two planar dielectric waveguides is examined on the basis of an integral-equation formulation. The aperture field is approximated by a finite set of discrete modes, characteristic of the region Z<0. Results are presented for the launching efficiency and reflection at the junction between a solid-state heterojunction laser and an optical waveguide.
Noise-correlation impedance of microwave transistors
- Author(s): E. Poggiagliolmi and R.A. King
- Source: Electronics Letters, Volume 8, Issue 9, p. 232 –233
- DOI: 10.1049/el:19720167
- Type: Article
- + Show details - Hide details
-
p.
232
–233
(2)
Measurements were carried out on a number of microwave transistors in the 1–2 GHz range to establish the degree of correlation between the internal noise sources of the transistor. An analysis of the results indicates that there is some detectable correlation at low collector currents.
Improved angular ambiguity and accuracy by aperture-modulation technique
- Author(s): F. Louange and J. Munier
- Source: Electronics Letters, Volume 8, Issue 9, p. 233 –235
- DOI: 10.1049/el:19720168
- Type: Article
- + Show details - Hide details
-
p.
233
–235
(3)
A time-domain method for splitting the angular information received by an antenna array is described, where an incident wave is divided into two channels, corresponding to one pattern with low angular ambiguity and another with improved accuracy. Two capital ways of processing both these signals are shown.
Improvement of the stability of high-voltage generators for perturbations within a frequency bandwidth of 0.03–1000 Hz
- Author(s): Michel Girard
- Source: Electronics Letters, Volume 8, Issue 9, p. 235 –236
- DOI: 10.1049/el:19720169
- Type: Article
- + Show details - Hide details
-
p.
235
–236
(2)
We have realised an electronic device with the aim of improving the relative stability in voltage dV/V of an electrostatic generator (voltage 400 kV, current 4 mA). This stability rose to 2×10−6 (from 2×10−5 previously) within a frequency bandwidth of 0.03–1000 Hz. This electronic device, placed between the earth of the high-voltage generator and the earth of the utilisation, is autonomous, i.e. it can be applied for all kinds of generators, of low, high or very high voltage, with currents up to about 100 mA. The gain in stability can only be fixed after knowing the real characteristics of the generator, which should be improved.
Double-extrapolation method for m.o.s.t. threshold-voltage measurements
- Author(s): P.J.T. Mellor
- Source: Electronics Letters, Volume 8, Issue 9, p. 236 –237
- DOI: 10.1049/el:19720170
- Type: Article
- + Show details - Hide details
-
p.
236
–237
(2)
The measurement of the m.o.s.-transistor threshold voltage under current-saturation conditions by double extrapolation to VD=0 and ID=0 is described. For comparison, it is shown that corresponding values obtained on thin- and thick-oxide devices conventionally, by single extrapolation to ID=0, may depend critically on the drain voltage and misrepresent the voltage at which the channel becomes inverted.
Comment on ‘Numerical check on the accuracy of spherical-wave expansions’
- Author(s): P.J. Wood
- Source: Electronics Letters, Volume 8, Issue 9, p. 237 –238
- DOI: 10.1049/el:19720171
- Type: Article
- + Show details - Hide details
-
p.
237
–238
(2)
A convergence criterion for the Laurent spherical-wave expansion is discussed, with particular emphasis on its dependence on the nature of the radiating source. Both an inappropriate choice of truncation point of the series and of the integration surface for the determination of the spherical-wave coefficients may introduce errors in near-field antenna calculations. However, a procedure is outlined which ensures that an accuracy of the order of one part in 105 is achieved.
Acoustic-beam profiles in surface-wave filters
- Author(s): M.S. Kharusi ; R.H. Tancrell ; R.C. Williamson
- Source: Electronics Letters, Volume 8, Issue 9, p. 238 –240
- DOI: 10.1049/el:19720172
- Type: Article
- + Show details - Hide details
-
p.
238
–240
(3)
The diffracted-beam profiles launched at different frequencies by chirped and apodised elastic surface-wave interdigital transducers on anisotropic substrates are calculated by means of an angular spectrum of straight-crested surface waves and are shown to agree with experiment in both amplitude and phase.
State-space interpretation of Foster-synthesis method for LC networks
- Author(s): Satish Puri and Hiroshi Takeda
- Source: Electronics Letters, Volume 8, Issue 9, p. 240 –241
- DOI: 10.1049/el:19720173
- Type: Article
- + Show details - Hide details
-
p.
240
–241
(2)
A state-space interpretation of the Foster-synthesis method for driving-point immittance functions of lossless networks is presented.
Unstable domains in solution-grown epitaxial InP
- Author(s): D.H. Paxman ; R.J. Tree ; C.E.C. Wood
- Source: Electronics Letters, Volume 8, Issue 9, p. 241 –243
- DOI: 10.1049/el:19720174
- Type: Article
- + Show details - Hide details
-
p.
241
–243
(3)
Current/time waveforms of two types have been observed in InP liquid epitaxial material, one showing a steady train of ‘domain-like’ oscillations, the other being unstable. It is observed that avalanching can take place in these latter samples, and it is suggested that this is the cause of the instability.
Relaxing-avalanche-mode reflection amplifier
- Author(s): G.C. Dalman ; F.G. Zappert ; C.A. Lee
- Source: Electronics Letters, Volume 8, Issue 9, p. 243 –244
- DOI: 10.1049/el:19720175
- Type: Article
- + Show details - Hide details
-
p.
243
–244
(2)
This letter discusses a single-stage relaxing-avalanche-mode silicon p+-n-n+ reflection amplifier operating at 7.4 GHz with a small-signal gain and half-power bandwidth of 31. 5 dB and 20 MHz, respectively. A description of the amplifier and a discussion of its operation are given.
Optimum control of linear systems in the presence of polynomial or sinusoidal disturbances
- Author(s): F.D. Galiana
- Source: Electronics Letters, Volume 8, Issue 9, p. 244 –245
- DOI: 10.1049/el:19720176
- Type: Article
- + Show details - Hide details
-
p.
244
–245
(2)
A feedback control based on optimal-linear-regulator theory can be designed for linear multivariable systems, with the property that the steady-state behaviour of its output is unaffected by unknown system disturbances of the polynomial or sinusoidal type. Integral feedback is a special case of this scheme.
Relaxing avalanche mode and its relation to TRAPATT, a.r.p. and IMPATT oscillators
- Author(s): F.G. Zappert and C.A. Lee
- Source: Electronics Letters, Volume 8, Issue 9, p. 245 –246
- DOI: 10.1049/el:19720177
- Type: Article
- + Show details - Hide details
-
p.
245
–246
(2)
A large-signal computer study has been used to examine the initiation of TRAPATT oscillations and the multifrequency nature of TRAPATT amplifiers. A relaxing avalanche mode is observed to lead to trapped-plasma generation below the critical current density qNdvs, merging smoothly to relaxation oscillations without a trapped plasma. The analysis shows that certain diode-circuit-impedance relationships should be met for self-initiation of TRAPATT oscillations and provides an explanation of the TRAPATT amplification mechanism of Prager, Chang and Weisbrod.
Efficient numerical solution of unbounded field problems
- Author(s): C.G. Williams and G.K. Cambrell
- Source: Electronics Letters, Volume 8, Issue 9, p. 247 –248
- DOI: 10.1049/el:19720178
- Type: Article
- + Show details - Hide details
-
p.
247
–248
(2)
An efficient numerical method for solving certain unbounded field problems is presented. The method uses both the differential and integral formulations of the field problem and combines the particular advantages of each. The results obtained from an application of the method to a 2-dimensional exterior Laplacian problem are compared with those obtained by other methods.
Erratum: Second-order recursive digital-filter element for poles near the unit circle and the real z axis
- Author(s): N.G. Kingsbury
- Source: Electronics Letters, Volume 8, Issue 9, page: 248 –248
- DOI: 10.1049/el:19720179
- Type: Article
- + Show details - Hide details
-
p.
248
(1)
Erratum: Radiation patterns of paraboloid with log-periodic dipole feed
- Author(s): P.A. McInnes ; E.W. Munro ; A.J.T. Whitaker
- Source: Electronics Letters, Volume 8, Issue 9, page: 248 –248
- DOI: 10.1049/el:19720180
- Type: Article
- + Show details - Hide details
-
p.
248
(1)
Erratum: Some Boolean matrix operators
- Author(s): C.R. Edwards
- Source: Electronics Letters, Volume 8, Issue 9, page: 248 –248
- DOI: 10.1049/el:19720181
- Type: Article
- + Show details - Hide details
-
p.
248
(1)
Erratum: Mapping eddy currents using a resistance network
- Author(s): P.A. Einstein and E.J. Bennet
- Source: Electronics Letters, Volume 8, Issue 9, page: 248 –248
- DOI: 10.1049/el:19720182
- Type: Article
- + Show details - Hide details
-
p.
248
(1)
Erratum: New results of an experimental sampling system for recording fast single events
- Author(s): R. Schwarte
- Source: Electronics Letters, Volume 8, Issue 9, page: 248 –248
- DOI: 10.1049/el:19720183
- Type: Article
- + Show details - Hide details
-
p.
248
(1)
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article
