Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 19, Issue 3, 3 February 1983
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 19, Issue 3
3 February 1983
Algorithm for VLSI chip floor plan
- Author(s): K. Ueda and H. Kitazawa
- Source: Electronics Letters, Volume 19, Issue 3, p. 77 –78
- DOI: 10.1049/el:19830055
- Type: Article
- + Show details - Hide details
-
p.
77
–78
(2)
An algorithm for a VLSI chip floor plan is presented. It uses initial block placement obtained by the AR (attractive and repulsive force) method, and performs iterative block packing by gradually moving and reshaping blocks with chip boundary shrinking. By the use of several types of experimental data, it is shown that the method is very effective for handling various types of blocks and is well suited to interactive chip layout design.
Numerical analysis of 4-arm Archimedean spiral antenna
- Author(s): H. Nakano ; J. Yamauchi ; S. Hashimoto
- Source: Electronics Letters, Volume 19, Issue 3, p. 78 –80
- DOI: 10.1049/el:19830056
- Type: Article
- + Show details - Hide details
-
p.
78
–80
(3)
The radiation fields of a 4-arm Archimedean spiral antenna excited with three types of balanced mode, M1(1, j, −1, −j), M2(1, −1, 1, −1) and M3(1, −j, −1, j), are evaluated on the basis of the current distributions which are determined numerically. An axial beam and conical beams are presented with experimental results. It is demonstrated that an axial ratio of less than 3 dB can be obtained over a wide angle range of about ± 60°, when the spiral is excited with modes 1 and 2. It is also found that the axial ratio for mode 3 is liable to be deteriorated by the reflected current, particularly around the spiral axis.
One watt CW visible single-quantum-well lasers
- Author(s): C. Lindström ; R.D. Burnham ; D.R. Scifres ; T.L. Paoli ; W. Streifer
- Source: Electronics Letters, Volume 19, Issue 3, p. 80 –81
- DOI: 10.1049/el:19830057
- Type: Article
- + Show details - Hide details
-
p.
80
–81
(2)
We report room-temperature CW high output power (1 W) at ~ 7770 Å from OM-VPE-grown ultra-thin single-quantum (~60 Å)-well lasers. The devices are broad-area (250 × 210 μm) lasers with a quantum-well GaAlAs active region doped with Mg, and with applied high reflective and low reflective mirror facets. For an output power of 1 W from the emitting facet, the DC-to-light conversion efficiency is as high as 21%.
Passive optical GaInAsP/InP waveguides
- Author(s): C. Bornholdt ; W. Döldissen ; D. Franke ; N. Grote ; J. Krauser ; U. Niggebrügge ; H.P. Nolting ; M. Schlak ; I. Tiedke
- Source: Electronics Letters, Volume 19, Issue 3, p. 81 –82
- DOI: 10.1049/el:19830058
- Type: Article
- + Show details - Hide details
-
p.
81
–82
(2)
We have fabricated GaInAsP/InP rib waveguides with lengths of up to 7 mm and widths between 2.5 and 10 μm. The waveguides show low losses of α = 1.38–1.84 cm−1 at a wavelength of 1.3 μm.
Short-cavity single-frequency InGaAsP buried-heterostructure lasers
- Author(s): T.P. Lee ; C.A. Burrus ; R.A. Linke ; R.J. Nelson
- Source: Electronics Letters, Volume 19, Issue 3, p. 82 –84
- DOI: 10.1049/el:19830059
- Type: Article
- + Show details - Hide details
-
p.
82
–84
(3)
Short-cavity (50–100 μm) index-guided lasers made by recleaving conventional 1.3 μm BH devices have been found to provide improved single-frequency output under both CW and modulated conditions.
Digital-filter functions with fast coefficient implementation: an addendum
- Author(s): R. Venkatesan and J.J. Narraway
- Source: Electronics Letters, Volume 19, Issue 3, page: 84 –84
- DOI: 10.1049/el:19830060
- Type: Article
- + Show details - Hide details
-
p.
84
(1)
Five parallel transfer function formulations for digital filters are given. The coefficients in these allow a simple and very fast multiplication process. These functions provide a maximum bandwidth of about double that of an earlier set.
Characterisation of second-order discrete-time filters
- Author(s): A. Nishihara
- Source: Electronics Letters, Volume 19, Issue 3, p. 84 –86
- DOI: 10.1049/el:19830061
- Type: Article
- + Show details - Hide details
-
p.
84
–86
(3)
Novel but very simple expressions characterising second-order discrete-time filters are presented. The parameters used are the centre angular frequency and the 3 dB bandwidth. The sensitivity analysis points out that Q (=ω0/ωb) has been misused as the measure related to sensitivity performance of discrete-time filters. Actually the sensitivity is approximately proportional to 1/ω0ωb for narrowband filters.
Adele, a fast suboptimal estimator for real-time deconvolution
- Author(s): G. Demoment and A. Segalen
- Source: Electronics Letters, Volume 19, Issue 3, p. 86 –88
- DOI: 10.1049/el:19830062
- Type: Article
- + Show details - Hide details
-
p.
86
–88
(3)
It is shown how a Kalman filter approach can solve an orthogonalisation problem that occurs when accelerating the convergence of the Kaczmarz algorithm for real-time deconvolution. A new suboptimal estimator is developed in the case of noise and input stationary statistics. Simulation results in reflection seismology are presented.
Effects of 140 Mbit/s operation on degradation of GaAlAs DH lasers
- Author(s): M.J. Robertson
- Source: Electronics Letters, Volume 19, Issue 3, p. 88 –89
- DOI: 10.1049/el:19830063
- Type: Article
- + Show details - Hide details
-
p.
88
–89
(2)
Results are reported of a lifetest to compare the degradation of long-lived 20 μm stripe oxide isolated GaAlAs lasers operated CW and under simulated 140 Mbit/s optical-fibre-system conditions. Following operation at 55°C and 5 mW output for 12000 h it is reasonable to suggest that degradation is not enhanced by operation under 140 Mbit/s system conditions.
Stability test for switched-capacitor filters
- Author(s): J. Taylor
- Source: Electronics Letters, Volume 19, Issue 3, p. 89 –91
- DOI: 10.1049/el:19830064
- Type: Article
- + Show details - Hide details
-
p.
89
–91
(3)
A general stability test is described which may be employed in the analysis of all switched-capacitor filters of the lossless discrete integrator (LDI) type.
Dispersion characteristics of asymmetric coupled slot lines on dielectric substrates
- Author(s): M. Kitlinski and B. Janiczak
- Source: Electronics Letters, Volume 19, Issue 3, p. 91 –92
- DOI: 10.1049/el:19830065
- Type: Article
- + Show details - Hide details
-
p.
91
–92
(2)
A modified coplanar waveguiding structure, an asymmetric coupled slot line, on a dielectric substrate is considered. The dispersion characteristics of asymmetric coupled slot lines and asymmetric coplanar waveguides are found in terms of the numerically efficient spectral domain technique.
Novel adaptive biasing amplifier
- Author(s): M.G. Degrauwe and W.M.C. Sansen
- Source: Electronics Letters, Volume 19, Issue 3, p. 92 –93
- DOI: 10.1049/el:19830066
- Type: Article
- + Show details - Hide details
-
p.
92
–93
(2)
A novel adaptive biasing amplifier is presented. This amplifier with a very low standby power dissipation has a high driving capability and consumes less power than the previously presented adaptive biasing amplifiers.
Control of the height of Schottky barriers on MBE GaAs
- Author(s): J.M. Woodcock and J.J. Harris
- Source: Electronics Letters, Volume 19, Issue 3, p. 93 –95
- DOI: 10.1049/el:19830067
- Type: Article
- + Show details - Hide details
-
p.
93
–95
(3)
The effective Schottky barrier height of nickel on gallium arsenide has been varied between 0.48 eV and 0.96 eV by using MBE to grow a range of thin heavily doped layers. Barrier lowering has been achieved with n-type layers doped with silicon or tin and barrier raising with p-type layers doped with beryllium. The ideality factor of the diodes was less than 1.2 in all cases.
Low-OH MCVD fibres without a barrier layer using OH → OD-exchanged substrate tubes
- Author(s): Hen-Tai Shang ; J. Stone ; C.A. Burrus
- Source: Electronics Letters, Volume 19, Issue 3, p. 95 –96
- DOI: 10.1049/el:19830068
- Type: Article
- + Show details - Hide details
-
p.
95
–96
(2)
The effect of deuteration (OH → OD exchange) of the MCVD substrate tube on the absorption loss in fibres was studied using tubes of moderate and low OH content. The OH absorption at 1.39 μm was reduced from 4 dB/km and 0.9 dB/km to 1 dB/km and 0.7 dB/km, respectively, in fibres made without a barrier layer using deuterated tubes.
Fusion splicing between optical circuits and optical fibres
- Author(s): N. Shimizu ; N. Imoto ; M. Ikeda
- Source: Electronics Letters, Volume 19, Issue 3, p. 96 –97
- DOI: 10.1049/el:19830069
- Type: Article
- + Show details - Hide details
-
p.
96
–97
(2)
Splicing between an optical fibre and a planar deposited silica waveguide was performed by using a CO2 laser as a heat source. The average splicing loss of 30 samples between a multimode graded-index fibre and a deposited silica waveguide was 0.18 dB. Reflection from the joining point disappeared by the fusion splicing.
Accurate method for characterising single-mode fibres: theory and experiment
- Author(s): A.K. Ghatak ; R. Srivastava ; I.F. Faria ; K. Thyagarajan ; R. Tiwari
- Source: Electronics Letters, Volume 19, Issue 3, p. 97 –99
- DOI: 10.1049/el:19830070
- Type: Article
- + Show details - Hide details
-
p.
97
–99
(3)
We present a direct method for determining the modal field from the far-field pattern of single-mode fibres having arbitrary index profiles. Analysis of experimental data shows that the method is relatively simple compared to other methods and gives accurate results.
Matrix partial-fraction expansion method
- Author(s): J. Leyva-Ramos and E.D. Denman
- Source: Electronics Letters, Volume 19, Issue 3, p. 99 –100
- DOI: 10.1049/el:19830071
- Type: Article
- + Show details - Hide details
-
p.
99
–100
(2)
A method for partial-fraction expansion of m × p transfer functions H(s) is presented, and a general formula is given. The procedure does not require derivatives for the case of repeated roots and it is suitable for digital computer applications.
Evolution of power distribution in graded-index fibres
- Author(s): S. Kawakami and H. Tanji
- Source: Electronics Letters, Volume 19, Issue 3, p. 100 –102
- DOI: 10.1049/el:19830072
- Type: Article
- + Show details - Hide details
-
p.
100
–102
(3)
Mode-coupling mechanism in square-law multimode fibres are experimentally studied. Measurements are done using the near- and far-field techniques. Special attention is paid to comparing the coupling strength of the microbending type (Δv = ± 1) with that of the elliptic deformation type (Δv = ± 2). Typically, the latter is much stronger. The significance of this property in transmission aspects is briefly reviewed.
Demodulation scheme fibre interferometric sensors employing laser frequency switching
- Author(s): A.D. Kersey ; D.A. Jackson ; M. Corke
- Source: Electronics Letters, Volume 19, Issue 3, p. 102 –103
- DOI: 10.1049/el:19830073
- Type: Article
- + Show details - Hide details
-
p.
102
–103
(2)
A demodulation technique suitable for use with fibre interferometric sensors is described. The scheme employs a frequency switched diode laser and an unbalanced Mach-Zehnder interferometer. Minimum phase sensitivity ≈ 2× 10-5 rad is obtainable, and can be shown to be limited by the laser phase noise.
Comment: Analysis of efficiency limitations in high-low emitter back surface field silicon solar cells
- Author(s): S.R. Dhariwal and R. Gadre
- Source: Electronics Letters, Volume 19, Issue 3, p. 103 –104
- DOI: 10.1049/el:19830074
- Type: Article
- + Show details - Hide details
-
p.
103
–104
(2)
CW high-power single-mode operation of gain-guided stripe-geometry multiple-quantum-well lasers
- Author(s): C. LindströM ; R.D. Burnham ; T.L. Paoli ; W. Streifer ; D.R. Scifres
- Source: Electronics Letters, Volume 19, Issue 3, p. 104 –106
- DOI: 10.1049/el:19830075
- Type: Article
- + Show details - Hide details
-
p.
104
–106
(3)
Stripe-geometry multiple-quantum-well GaAs-GaAlAs lasers grown by MO-CVD are reported to operate fundamental spatial and longitudinal mode up to more than 40 mW CW.
Analogue optical link for multichannel frequency-modulated television transmission
- Author(s): T.T. Tjhung ; T.K. Lim ; F.V.C. Mendis
- Source: Electronics Letters, Volume 19, Issue 3, p. 106 –107
- DOI: 10.1049/el:19830076
- Type: Article
- + Show details - Hide details
-
p.
106
–107
(2)
The performance of an analogue optical link for the transmission of multichannel frequency-modulated TV signals with small frequency deviations is measured. A signal/noise ratio of 47 dB is achieved on a four-channel PAL system with a frequency deviation of 600 kHz, a bandwidth of 16 MHz per channel and an interchannel spacing of 18 MHz.
29 GHz E-plane biphase modulator
- Author(s): W. Thorpe and J.D. Gilliland
- Source: Electronics Letters, Volume 19, Issue 3, p. 107 –109
- DOI: 10.1049/el:19830077
- Type: Article
- + Show details - Hide details
-
p.
107
–109
(3)
A biphase PSK modulator for use in 29 GHz radio equipment has been developed that gives state-of-the-art performance (less than 3 dB insertion loss across 7% bandwidth, including transition losses, and 70/100 Mbit/s data rate using PIN diodes as the switching elements). A drive amplifier has been developed for use with the modulator that allows beam lead PIN diodes with a long minority carrier lifetime to be used in the circuit up to 70 Mbit/s.
High-speed decoding technique for slip detection in data transmission systems using modified cyclic block codes
- Author(s): S.R. Ely ; D.T. Wright ; C.C. Goodyear
- Source: Electronics Letters, Volume 19, Issue 3, p. 109 –110
- DOI: 10.1049/el:19830078
- Type: Article
- + Show details - Hide details
-
p.
109
–110
(2)
An efficient method is described for evaluating the error-checking syndrome for systems which are modified cyclic or shortened cyclic codes to detect slips of block synchronisation.
10 kHz linewidth 1.5 μm InGaAsP external cavity laser with 55 nm tuning range
- Author(s): R. Wyatt and W.J. Devlin
- Source: Electronics Letters, Volume 19, Issue 3, p. 110 –112
- DOI: 10.1049/el:19830079
- Type: Article
- + Show details - Hide details
-
p.
110
–112
(3)
An InGaAsP 1.5 μm laser, with one facet antireflection coated, has been incorporated into a diffraction grating external cavity. The lasing wavelength could be tuned over a 55 nm range about the centre wavelength of 1.5 μm by rotating the grating. Furthermore, it was found that the emission spectrum was extremely narrow; beat-frequency measurements at 1523 nm against an HeNe laser showed it to be of the order of 10 kHz.
AlN capped annealing of Se and Sn implanted semi-insulating GaAs
- Author(s): R. Bensalem ; N.J. Barrett ; B.J. Sealy
- Source: Electronics Letters, Volume 19, Issue 3, p. 112 –113
- DOI: 10.1049/el:19830080
- Type: Article
- + Show details - Hide details
-
p.
112
–113
(2)
High-dose room-temperature implants of Se and Sn in undoped semi-insulating GaAs have been pulse-annealed at 1000°C using AlN as an encapsulant. Good electrical results and an improved surface quality were achieved compared with the use of CVD Si3N4 layers.
Quaternary 1.5 μm (InGaAsP/InP) buried crescent lasers with separate optical confinement
- Author(s): J.P. Van Der Ziel ; H. Temkin ; R.A. Logan
- Source: Electronics Letters, Volume 19, Issue 3, p. 113 –115
- DOI: 10.1049/el:19830081
- Type: Article
- + Show details - Hide details
-
p.
113
–115
(3)
InGaAsP (λ = 1.5 μm) crescent geometry lasers grown in etched V grooves are characterised. The active layer is surrounded by asymmetric InGaAsP (λ = 1.3 μm) cladding layers which provide separate optical confinement. The lasers have 25–30 mA thresholds and external quantum efficiencies of 0.5–0.6 at 300 K. Fundamental mode operation is obtained up to 15 mW/facet at room temperature.
Prediction of scattering cross-section reductions due to plate orthogonality errors in trihedral radar reflectors
- Author(s): K.M. Keen
- Source: Electronics Letters, Volume 19, Issue 3, p. 115 –117
- DOI: 10.1049/el:19830082
- Type: Article
- + Show details - Hide details
-
p.
115
–117
(3)
A method is presented for the determination of the reduction in scattering cross-section levels due to angular errors between plates in trihedral radar corner reflectors. The method applies to any regular reflector shape and for any incident ray direction in the reflector main beam zone; it owes its viability to a recently developed technique for determining trihedral reflector effective areas. The analysis is not exact, but gives good agreement with experimental results for a wide range of reflector sizes.
In situ mass spectrometric investigation of metallised InP samples during annealing
- Author(s): I. Mojzes ; D. Szigethy ; R. Veresegyházy
- Source: Electronics Letters, Volume 19, Issue 3, p. 117 –118
- DOI: 10.1049/el:19830083
- Type: Article
- + Show details - Hide details
-
p.
117
–118
(2)
In situ mass spectrometry was used to study the interaction of the metal-InP system. In the presence of a thin gold layer on the crystal surface the phosphorus yield showed characteristical peak against temperature with a relatively high rate of evaporation. Contact systems containing gallium and indium were also investigated. A thin Ga layer deposited into the gold film eliminated the characteristical phosphorus losses.
Inductive twin-strip gratings in incident TE waves
- Author(s): M.J. Archer
- Source: Electronics Letters, Volume 19, Issue 3, p. 118 –120
- DOI: 10.1049/el:19830084
- Type: Article
- + Show details - Hide details
-
p.
118
–120
(3)
The inductive sides of square loops, or the inductive end caps of the Jerusalem cross, are regarded as segments of a regular strip grating, in order to devise equivalent-circuit models of frequency surfaces. This approximation involves errors, depending on frequency, angle of incidence and the choice of the grating. These are investigated here by analysing the case of inductive twin-strip gratings in TE incidence, and comparing them with regular gratings, giving specific examples.
Use of far-field radiation pattern to characterise single-mode symmetric slab waveguides
- Author(s): A.C. Boucouvalas
- Source: Electronics Letters, Volume 19, Issue 3, p. 120 –121
- DOI: 10.1049/el:19830085
- Type: Article
- + Show details - Hide details
-
p.
120
–121
(2)
The far-field intensity pattern is used for determining the core dimensions and refractive-index difference between core and cladding, of a single-mode (TE) symmetric dielectric slab waveguide. Similarities with the same technique in cylindrical co-ordinates are pointed out.
Suppression of bulk modes in SAW transversal filters by gold transducers
- Author(s): L. Bickers
- Source: Electronics Letters, Volume 19, Issue 3, p. 121 –122
- DOI: 10.1049/el:19830086
- Type: Article
- + Show details - Hide details
-
p.
121
–122
(2)
Unwanted bulk modes in surface-acoustic-wave (SAW) transversal filters are demonstrated to be dependent on the transducer metallisation. Experimental results are presented that compare Au with the more conventional Al metallisation and show that bulk modes can be suppressed by > 20 dB.
High-resolution digital sinewave generation
- Author(s): J.M. Worley
- Source: Electronics Letters, Volume 19, Issue 3, p. 123 –124
- DOI: 10.1049/el:19830087
- Type: Article
- + Show details - Hide details
-
p.
123
–124
(2)
A technique is described for the generation of high-resolution sinusoidal waveforms in digital form, using an economical look-up-table method. Table storage requirements are typically an order of magnitude lower than for conventional look-up-table methods, but are achieved without the need for complex interpolation algorithms.
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
