Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 9, 28 April 1977
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 13, Issue 9
28 April 1977
Theoretical model for a microsctip optoelectronic switch
- Author(s): A. Meriau ; R. Castagne ; R. Laval ; S. Laval
- Source: Electronics Letters, Volume 13, Issue 9, p. 245 –246
- DOI: 10.1049/el:19770177
- Type: Article
- + Show details - Hide details
-
p.
245
–246
(2)
A theoretical model is given to represent the active part of either an optoelectronic switch, similar to those described by Auston el al., or an optoelectronic gate such as the one we developed. These devices consist mainly of a microstrip line, with a characteristic impedance of 50 Ω, which is deposited on a high-resistivity semiconductor. The centre strip has a break, creating a gap which can be illuminated by an optical laser pulse. The latter generates an electron-hole plasma of high density at the surface of the semiconductor, allowing the transmission of a signal across the gap.
Light-controlled semiconductor waveguide antenna
- Author(s): R. Karg and E. Kreutzer
- Source: Electronics Letters, Volume 13, Issue 9, p. 246 –247
- DOI: 10.1049/el:19770178
- Type: Article
- + Show details - Hide details
-
p.
246
–247
(2)
A rectangular dielectric waveguide of intrinsic semiconductor material has been investigated for an application in the 30–40 GHz range. The resistivity of the semiconductor material has locally been changed by GaAs-laser-beam illumination. Depending on the pattern and intensity of the light spot, the generated waveguide inhomogeneity behaves essentially as a termination, a short circuit or an antenna element. This effect can be controlled in position and time. Hence the optically controlled waveguide can be used either as an antenna for fast aperture scanning or as a simple optoelectronically tuned antenna array.
OH-ion distribution profiles in rod preforms of high-silica optical waveguide
- Author(s): M. Kawachi ; M. Horiguchi ; A. Kawana ; T. Miyashita
- Source: Electronics Letters, Volume 13, Issue 9, p. 247 –248
- DOI: 10.1049/el:19770179
- Type: Article
- + Show details - Hide details
-
p.
247
–248
(2)
To investigate the OH-contamination mechanism in high-silica optical waveguide, we have measured optically OH-ion distribution profiles in rod preforms prepared by the c.v.d. technique. The contamination due to OH diffusion from the supporting silica tube was clarified in relation to the deposited barrier-glass-layer thickness.
Acoustic-bulk-wave resonators and filters operating in the fundamental mode at frequencies greater than 100 MHz
- Author(s): M. Berté
- Source: Electronics Letters, Volume 13, Issue 9, p. 248 –250
- DOI: 10.1049/el:19770180
- Type: Article
- + Show details - Hide details
-
p.
248
–250
(3)
A localised ion-beam milling has been used to increase the fundamental frequency of acoustic-bulk-wave resonators. Monolithic filters in lithium niobate (Y+37°) and lithium tantalate (X) operating, respectively, at 220 and 230 MHz have been realised. The relative bandwidth is equal to 1% and the insertion loss is about 4 dB. An a.t.-cut quartz resonator working in the fundamental mode at 270 MHz with a Q-factor of 12 000 has also been obtained. In this case, the vibrating membrane is 6 μm thick, with a centre portion of diameter 2.5 mm.
Expressions for the analysis of digital transmission systems
- Author(s): D.G.W. Ingram
- Source: Electronics Letters, Volume 13, Issue 9, p. 250 –251
- DOI: 10.1049/el:19770181
- Type: Article
- + Show details - Hide details
-
p.
250
–251
(2)
It is shown that, if the sinusoidal roll-off response commonly used in the analysis of digital transmission systmes is replaced by a trapezoidal response, it is possible to derive algebraic expressions for the signal/noise ratio and error rate in cases of practical importance.
Utilisation of a single inductorless neuristor line section as a voltage-to-frequency convertor
- Author(s): Z. Czarnul and M. Bialko
- Source: Electronics Letters, Volume 13, Issue 9, p. 251 –252
- DOI: 10.1049/el:19770182
- Type: Article
- + Show details - Hide details
-
p.
251
–252
(2)
The principle of operation of a neuristor line for input pulses having duration times longer than the refractory period of the line is presented. In this case, a series of neuristor pulses are generated and appear at the output of the line. The duration time of the generated pulse ‘package’ corresponds to the duration time of the input pulse, while the repetition frequency of pulses is proportional to the amplitude of the input pulse. Theoretical relations and practical verification of the circuit operation are described.
Pattern-recognition properties of r.a.m./r.o.m. arrays
- Author(s): J. Dobrée Wilson Manissa and I. Aleksander
- Source: Electronics Letters, Volume 13, Issue 9, p. 253 –254
- DOI: 10.1049/el:19770183
- Type: Article
- + Show details - Hide details
-
p.
253
–254
(2)
Arrays of r.a.m.s may be used as trainable logic devices in arrays whose object is to recognise patterns. The way in which such a system is organised is presented and some of the characteristics of the nature of the recognition are discussed
Method of obtaining radiowave propagation parameters for the Earth–ionosphere duct at e.l.f.
- Author(s): M. Ishaq and D. Llanwyn Jones
- Source: Electronics Letters, Volume 13, Issue 9, p. 254 –255
- DOI: 10.1049/el:19770184
- Type: Article
- + Show details - Hide details
-
p.
254
–255
(2)
The wave impedance of the Earth–ionosphere duct is investigated numerically and analytically in the frequency band 1 to 60 Hz. Data are presented enabling the determination of the propagation parameters of the duct by experimental measurement of the argument of the wave impedance.
Pulse response and microbending losses of an optical glass-fibre waveguide with a bump in its index profile
- Author(s): W. Eickhoff and O. Krumpholz
- Source: Electronics Letters, Volume 13, Issue 9, p. 256 –257
- DOI: 10.1049/el:19770185
- Type: Article
- + Show details - Hide details
-
p.
256
–257
(2)
It is shown that a short light pulse is split into two separate output pulses when transmitted through a graded-index fibre with a refractive-index bump in its centre. For the fibre investigated, the bump acts as a monomode waveguide. This monomode waveguide turned out to be much less sensitive to microbending than the multimode graded-index waveguide, which is in agreement with existing theories.
Compensating fibre splice technique
- Author(s): D.B. Schilb and M.L. Dakss
- Source: Electronics Letters, Volume 13, Issue 9, p. 257 –258
- DOI: 10.1049/el:19770186
- Type: Article
- + Show details - Hide details
-
p.
257
–258
(2)
A low-loss, rugged splicing technique has been demonstrated. The technique compensates for fibre core eccentricity, cladding-diameter variations and cladding noncircularity. No precision connectors or housings are left on the fibres.
Simple electronically tunable 2nd-order active filter
- Author(s): J.B. Grimbleby
- Source: Electronics Letters, Volume 13, Issue 9, p. 258 –260
- DOI: 10.1049/el:19770187
- Type: Article
- + Show details - Hide details
-
p.
258
–260
(3)
A new current-tunable 2nd-order active filter is described which is based on the variation of the transconductance of a bipolar transistor with bias current. The circuit can give a lowpass or bandpass 2nd-order response or can be cascaded to give a high-order all-pole tunable filter. Measurements have indicated that a tuning range of at least four decades is possible with a dynamic range of 75 dB.
Second-harmonic locking properties of l.s.a.-mode transferred-electron oscillators
- Author(s): F.J. Lidgey and P.J. Allen
- Source: Electronics Letters, Volume 13, Issue 9, p. 260 –261
- DOI: 10.1049/el:19770188
- Type: Article
- + Show details - Hide details
-
p.
260
–261
(2)
Harmonic injection locking of an l.s.a.-mode oscillator has been studied by computer simulation. The results show that under certain circuit conditions the 2nd-harmonic frequency locking range may exceed that of the fundamemtal.
Effects of γ-irradiation on some cholesteric products
- Author(s): B. Kerllenevich and A. Coche
- Source: Electronics Letters, Volume 13, Issue 9, p. 261 –262
- DOI: 10.1049/el:19770189
- Type: Article
- + Show details - Hide details
-
p.
261
–262
(2)
A γ-ray-irradiation produces a shift of the temperature corresponding to a given wavelength of selective reflection in a cholesteric mixture towards lower temperatures (1degC for an increase of 1 Mrad). This effect can be used in γ-dosimetry.
Figure of merit for avalanche photodiodes
- Author(s): Hiroshi Kanbe and Tatsuya Kmura
- Source: Electronics Letters, Volume 13, Issue 9, p. 262 –264
- DOI: 10.1049/el:19770190
- Type: Article
- + Show details - Hide details
-
p.
262
–264
(3)
With regard to optimum signal/noise ratio at an optical receiver output, a figure of merit for an avalanche photodiode is proposed of the form η/√κ, where n is the quantum efficiency and k is the ratio of the hole ionisation coefficient β to that of an electron, α. An optimum avalanche-region width is estimated by using the figure of merit for a silicon avalanche photodiode at a given breakdown voltage.
New television test waveform
- Author(s): J.E. Holder
- Source: Electronics Letters, Volume 13, Issue 9, page: 264 –264
- DOI: 10.1049/el:19770191
- Type: Article
- + Show details - Hide details
-
p.
264
(1)
A new test waveform has been devised to facilitate the adjustment of T.V. transmitters. The new waveform provides both time-domain and frequency-domain components on a single line of the television waveform.
Dielectric-clad discone
- Author(s): K.F. Woodman
- Source: Electronics Letters, Volume 13, Issue 9, p. 264 –265
- DOI: 10.1049/el:19770192
- Type: Article
- + Show details - Hide details
-
p.
264
–265
(2)
A dielectric-clad discone has been designed for use in the frequency band 250–1100 MHz, possessing a v.s.w.r. ≤ 2 over most of the frequency range and being about 30% smaller than its equivalent metal unclad version. A radiating efficiency of 45% was obtained, the relatively low figure being due to dielectric loss in the cladding.
Microbending loss of multimode square-law fibres: a ray theory
- Author(s): M. Rousseau and J. Arnaud
- Source: Electronics Letters, Volume 13, Issue 9, p. 265 –267
- DOI: 10.1049/el:19770193
- Type: Article
- + Show details - Hide details
-
p.
265
–267
(3)
Using a simple ray theory, we show that the steady-state microbending loss of multimode square-law fibres is equal to 8γ/Δ dB/m. We have defined Δ = Δn/n, and γ is the power-spectral density of the fibre axis curvature in any meridional plane at the natural frequency of ray oscillation, expressed in reciprocal metres. The steady-state irradiance distribution in the fibre core is also given.
Decision-directed reference carrier generation in an autocorrelation receiver
- Author(s): K.H. Annecke
- Source: Electronics Letters, Volume 13, Issue 9, p. 267 –268
- DOI: 10.1049/el:19770194
- Type: Article
- + Show details - Hide details
-
p.
267
–268
(2)
A receiver for an asynchronous spread-spectrum system is described with special regard to initial synchronisation and error probability in the steady state for a 2-P.S.K. system. The results of simulations and measurements for an analogue and a digital version of the receiver are presented.
C.C.D. processor for simultaneous time stretching and signal averaging
- Author(s): G.D. Cain and R.C.S. Morling
- Source: Electronics Letters, Volume 13, Issue 9, p. 269 –270
- DOI: 10.1049/el:19770195
- Type: Article
- + Show details - Hide details
-
p.
269
–270
(2)
A novel dual-C.C.D signal processor is described which operates on a periodic input signal in such a manner that the input undergoes time-scale stretching while also being reinforced in amplitude in direct proportion to the number of delay stages in the c.c.d.s composing the structure. The timescaling effect is beneficial, since the signal variations are slowed to permit subsequent lower-bandwidth processing and/or display. The amplitude reinforcement works to partially cancel out any attendant noise contamination, making this simple processor readily applicable where signal averaging is desired.
C.C.D.-addressed liquid-crystal displays
- Author(s): S.D. Brotherton ; A. Gill ; M.J. King
- Source: Electronics Letters, Volume 13, Issue 9, p. 270 –272
- DOI: 10.1049/el:19770196
- Type: Article
- + Show details - Hide details
-
p.
270
–272
(3)
A charge-coupled device is described in which there is nondestructive charge sensing in every bit by using an integrated f.e.t. The f.e.t.s are capable of swinging up to 40 V across high-impedance loads, and it is shown that the device is suitable for receiving information in serial form and using it to address a liquid-crystal display.
Erratum: Maximum information capacity of fibre-optic waveguides
- Author(s): F.P. Kapron
- Source: Electronics Letters, Volume 13, Issue 9, page: 272 –272
- DOI: 10.1049/el:19770197
- Type: Article
- + Show details - Hide details
-
p.
272
(1)
Erratum: Parallel-in/serial-out: a new approach for c.c.d. transversal filters
- Author(s): K. Knauer ; L. Mader ; H.-J. Pfleiderer ; M. Schlichte
- Source: Electronics Letters, Volume 13, Issue 9, page: 272 –272
- DOI: 10.1049/el:19770198
- Type: Article
- + Show details - Hide details
-
p.
272
(1)
Erratum: Effect of vibration on s.a.w.-oscillator noise spectra
- Author(s): R.D. Weglein and O.W. Otto
- Source: Electronics Letters, Volume 13, Issue 9, page: 272 –272
- DOI: 10.1049/el:19770199
- Type: Article
- + Show details - Hide details
-
p.
272
(1)
Comment on ‘Low-frequency behaviour of the Beverage aerial’
- Author(s): J.R. Wait
- Source: Electronics Letters, Volume 13, Issue 9, page: 272 –272
- DOI: 10.1049/el:19770200
- Type: Article
- + Show details - Hide details
-
p.
272
(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