Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 15, Issue 5, 1 March 1979
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 15, Issue 5
1 March 1979
Vapour-grown 1.3 μm InGaAsP/InP avalanche photodiodes
- Author(s): G.H. Olsen and H. Kressel
- Source: Electronics Letters, Volume 15, Issue 5, p. 141 –142
- DOI: 10.1049/el:19790100
- Type: Article
- + Show details - Hide details
-
p.
141
–142
(2)
A novel planar InGaAsP/InP avalanche photodiode structure prepared by vapour-phase epitaxy is described. Avalanche gain up to 20 at 1.3 μm and at reverse breakdown of 65 V has been measured.
Quantiser selection for interframe differential pulse code modulation of television pictures
- Author(s): T.J. Dennis
- Source: Electronics Letters, Volume 15, Issue 5, p. 142 –144
- DOI: 10.1049/el:19790101
- Type: Article
- + Show details - Hide details
-
p.
142
–144
(3)
A procedure based on subjective and objective assessments has been used to design an 8-level quantiser for an interframe d.p.c.m. digital television coding system handling monochrome 5.5 MHz 625-line pidura The quantiser reduces noise in a static picture over its 8-bit source and attempts to minimise the distortion of movement.
Automatic selective equaliser for telephone facsimile transmission
- Author(s): Yoshizumi Eto and Yasuhiro Hirano
- Source: Electronics Letters, Volume 15, Issue 5, p. 144 –145
- DOI: 10.1049/el:19790102
- Type: Article
- + Show details - Hide details
-
p.
144
–145
(2)
A simple automatic equaliser designed especially for G2 as well as G1 facsimile signals received through carrier links is presented. The new method requires no additional signal, utilising only a phasing signal to fix the equalising parameters by detecting the symmetry in the received step response.
Optimal estimation of a common phase difference between pairs of fluctuating signals in noise
- Author(s): R. Voles
- Source: Electronics Letters, Volume 15, Issue 5, p. 145 –146
- DOI: 10.1049/el:19790103
- Type: Article
- + Show details - Hide details
-
p.
145
–146
(2)
For estimating a common phase difference between pairs of signals subject to joint fluctuation and contaminated by relatively low noise levels, the optimal phase weighting function is the square of the corresponding signal amplitude and the variance of the result is approximately inversely proportional to the average signal/noise ratio.
New automatic-gain-control system for optical receivers
- Author(s): M. Eve and D.W. Smith
- Source: Electronics Letters, Volume 15, Issue 5, p. 146 –147
- DOI: 10.1049/el:19790104
- Type: Article
- + Show details - Hide details
-
p.
146
–147
(2)
A device using liquid crystals can be readily inserted in existing optical communications to simplify receiver circuitry, allow planning flexibility and simplify maintenance.
Propagation delay optimisation in multistage GaAs m.e.s.f.e.t. combinational logic circuits by use of dynamic programming
- Author(s): Arpad Barna
- Source: Electronics Letters, Volume 15, Issue 5, p. 147 –149
- DOI: 10.1049/el:19790105
- Type: Article
- + Show details - Hide details
-
p.
147
–149
(3)
Propagation delays in multistage combinational logic circuits using GaAs metal-semiconductor field-effect transistors (m.e.s.f.e.t.s) are optimised subject to constraints on the overall power dissipation. Specific optimisation criteria are derived for 1-stage, 2-stage, and 3-stage combinational logic circuits. The results are evaluated with parameters of an existing process.
Bandwidth-limited operation of nonideal graded-index fibres
- Author(s): L. Jeunhomme
- Source: Electronics Letters, Volume 15, Issue 5, p. 149 –150
- DOI: 10.1049/el:19790106
- Type: Article
- + Show details - Hide details
-
p.
149
–150
(2)
Using previously established analytical formulas, we consider the increase in bandwidth and loss due to mode coupling for graded-index fibres, with an index gradient that slightly differs from its optimal shape. Results show that the maximum possible length of a typical link can be increased by 100%. if well controlled mode coupling is induced.
Orientation dependence of n-type GaAs intrinsic avalanche response time
- Author(s): J.J. Berenz ; J. Kinoshita ; T.L. Hierl ; A. Lee Charles
- Source: Electronics Letters, Volume 15, Issue 5, p. 150 –152
- DOI: 10.1049/el:19790107
- Type: Article
- + Show details - Hide details
-
p.
150
–152
(3)
The intrinsic avalanche response time of n-type GaAs has been measured for each of the three principal crystallographic orientations: <100>, <110> and <111>. The experimental response times are compared with theoretical values computed using the most recent ionisation-rate data. The <111> orientation is found to have the shortest response time and the <110> has the longest response time, for a nominal net donor density of 4.5 × 1016 cm−3.
Practical machine for electric arc splicing of optical fibres in the field
- Author(s): K.D. Khoe
- Source: Electronics Letters, Volume 15, Issue 5, p. 152 –153
- DOI: 10.1049/el:19790108
- Type: Article
- + Show details - Hide details
-
p.
152
–153
(2)
A portable machine is provided with a 7 cm × 5 cm daylight screen where a stereogram of the fibre ends is displayed. Easy adjustment is made without first cleaning the supports. The fibres are then polished, butted and welded automatically. Average losses of 0–06 dB arc obtained with graded-index fibres.
Higher output power from BARITT diodes using ion implantation
- Author(s): B.M. Armstrong ; R.A. Moore ; J. Wakefield
- Source: Electronics Letters, Volume 15, Issue 5, p. 153 –155
- DOI: 10.1049/el:19790109
- Type: Article
- + Show details - Hide details
-
p.
153
–155
(3)
Phosphorus-ion implantation has been used in simple m-n-p+ Baritt diodes to controllably modify electric-field profiles and give increased output power.
New electrostatic probe for absolute measurement of amplitude of surface acoustic wave
- Author(s): J.B. Moreau ; Ramzy Hashim ; J.C. Neau
- Source: Electronics Letters, Volume 15, Issue 5, p. 155 –156
- DOI: 10.1049/el:19790110
- Type: Article
- + Show details - Hide details
-
p.
155
–156
(2)
A new electrostatic probe is proposed for the absolute measurement of the amplitude of s.a.w. propagating on piezoelectric materials. Experimental measurements have been done on Y-cut Z-propagation LiNbO3 and results are compared with those obtained using an optical probe.
Metalorganic c.v.d. growth of GaAs-GaAlAs double heterojunction lasers having low interfacial recombination and low threshold current
- Author(s): E.J. Thrush ; P.R. Selway ; G.D. Henshall
- Source: Electronics Letters, Volume 15, Issue 5, p. 156 –158
- DOI: 10.1049/el:19790111
- Type: Article
- + Show details - Hide details
-
p.
156
–158
(3)
Double heterostructure laser junctions have been prepared by the metalorganic vapour deposition process and evaluated for threshold current and for nonradiative recombination characteristics. Threshold currents around 850 A cm−2 were obtained, and measurements of carrier lifetime and spontaneous emission efficiency correlate well with a nonradiative lifetime of 20 ns. This value is similar to those obtained in junctions grown by liquid-phase epitaxy and puts an upper limit on interface recombination velocity of 500 cm s−1.
Rotation of a waveform generator
- Author(s): B.Z. Kaplan
- Source: Electronics Letters, Volume 15, Issue 5, p. 158 –159
- DOI: 10.1049/el:19790112
- Type: Article
- + Show details - Hide details
-
p.
158
–159
(2)
A recently suggested oscillator model which generates two triangular waves in quadrature is transformed by rotation to a new model that generates two trapezoidal waves also in quadrature. In the phase plane the limit cycle of the first oscillator model is in a form of a square standing on its edge, the limit cycle of the latter is a square lying on its side.
Low-loss fibres for wavelengths beyond 1 μm
- Author(s): U. Zwick ; W. Auer ; I. Riegl ; H. Haupt ; W. Heitmann
- Source: Electronics Letters, Volume 15, Issue 5, p. 159 –160
- DOI: 10.1049/el:19790113
- Type: Article
- + Show details - Hide details
-
p.
159
–160
(2)
Graded-index optical fibres with germanium-boron and with germanium-phosphorus doped silica core have been fabricated. The dependence of the infrared absorption edge on the boron concentration was investigated. For the germanium-phosphorus doped fibre a broad transmission window with losses below 1.5 dB/km between 1500 and 1720 nm was found.
Method of calculating the modal delay for optical fibres with arbitrary refractive-index profiles
- Author(s): D.H. Irving and A.E. Karbowiak
- Source: Electronics Letters, Volume 15, Issue 5, p. 160 –162
- DOI: 10.1049/el:19790114
- Type: Article
- + Show details - Hide details
-
p.
160
–162
(3)
A method for calculating the modal delay characteristics of multimode optical fibres with arbitrary refractive index profiles is described, which is quick, accurate, and can be used with either an analytical or an experimentally measured profile.
Intermodulation improvement for multichannel television distribution by appropriate channel allocations and the use of 1/3rd line offsets
- Author(s): J.M. Griffiths
- Source: Electronics Letters, Volume 15, Issue 5, p. 162 –163
- DOI: 10.1049/el:19790115
- Type: Article
- + Show details - Hide details
-
p.
162
–163
(2)
In addition to the use of frequency plans to reduce intermodulation interference between carriers, in the case of television distribution further improvement can be obtained by using⅓ line-rate frequency offsets. Some results are tabulated.
High peripheral power density GaAs f.e.t. oscillator
- Author(s): J.S. Joshi and J.A. Turner
- Source: Electronics Letters, Volume 15, Issue 5, p. 163 –164
- DOI: 10.1049/el:19790116
- Type: Article
- + Show details - Hide details
-
p.
163
–164
(2)
Peripheral power density (p.p.d.), i.e. the output power per Unit gate width is defined as a figure of merit for GaAs f.e.t. oscillators. An X-band oscillator circuit using series and shunt feedback is described and its performance characteristies indicated. It is shown that this GaAs f.e.t. oscillator circuit configuration has the highest peripheral power density.
Erratum: Some proposals for improved forms of precision fast digital-analogue and analogue-digital convertors
- Author(s): J.R. Stockton and R.B.D. Knight
- Source: Electronics Letters, Volume 15, Issue 5, page: 166 –166
- DOI: 10.1049/el:19790117
- Type: Article
- + Show details - Hide details
-
p.
166
(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
