Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 15, Issue 6, 15 March 1979
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Volume 15, Issue 6
15 March 1979
Switched-capacitor simulation of grounded inductors using operational-amplifier pole
- Author(s): E. Sánchez-Sinencio and J.L. Gómez-Osorio
- Source: Electronics Letters, Volume 15, Issue 6, p. 169 –170
- DOI: 10.1049/el:19790118
- Type: Article
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–170
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A simulation of a grounded inductor using a switched capacitor and the pole of an operational amplifier is presented. The simulation inductor has good high-frequency and Q performance.
Low-cost analogue voltage-voltage convertors with arbitrary transfer characteristics
- Author(s): Shoji Suzuki ; Seiji Shinmyo ; Jiro Sasaki
- Source: Electronics Letters, Volume 15, Issue 6, p. 170 –171
- DOI: 10.1049/el:19790119
- Type: Article
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p.
170
–171
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An analogue voltage-voltage convertor circuit using l.e.d-CdSe photoresistors and several active elements is proposed. The error in a transfer characteristic were less than 1% in the compensated experimental circuit.
Miniaturised, hybrid, 500 Mb/s optical receiver package for data-link applications
- Author(s): T.N.C. Venkatesan and K. Ogawa
- Source: Electronics Letters, Volume 15, Issue 6, p. 171 –172
- DOI: 10.1049/el:19790120
- Type: Article
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p.
171
–172
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A clocked, hybrid, 500 Mb/s optical-receiver circuit in a 24-pin package with a −23 dBm sensitivity, 10−9 b.e.r. and an avalanche gain of 10 is described.
Directional coupling of magnetostatic surface waves in layered magnetic thin films
- Author(s): H. Sasaki and N. Mikoshiba
- Source: Electronics Letters, Volume 15, Issue 6, p. 172 –174
- DOI: 10.1049/el:19790121
- Type: Article
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172
–174
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The propagation characteristics of magnetostatic surface waves (m.s.s.w.) in a layered system of y.i.g. film, dielectric, y.i.g. film, are theoretically investigated. It is shown that the directional coupling of m.s.s.w. is possible between y.i.g. films. The directional coupling has frequency filtering characteristics due to dispersion of m.s.s.w.
Contribution of the discrete modes to the current propagating along a wire parallel to a moderate conducting earth
- Author(s): G. Courbet ; P. Degauque ; B. Demoulin ; R. Gabillard
- Source: Electronics Letters, Volume 15, Issue 6, p. 174 –175
- DOI: 10.1049/el:19790122
- Type: Article
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Previous theoretical work on the propagation of electromagnetic waves along a thin wire parallel to the air-ground interface is applied to determine the current propagating along the line when a moderate conducting earth is assumed. We only consider the discrete modes due to residue contributions of the modal equation. The results show the limit of validity of the quasi-TEM approximation and that the fast-wave mode excited by a delta-function voltage generator at the centre of an antenna above a moderate conducting earth cannot be a priori neglected.
Modulation characteristics of InGaAsP/InP l.e.d.s at 1.5 μm wavelength
- Author(s): Susumu Machida ; Haruo Nagai ; Tatsuya Kimura
- Source: Electronics Letters, Volume 15, Issue 6, p. 175 –177
- DOI: 10.1049/el:19790123
- Type: Article
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175
–177
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Dynamic characteristics of InGaAsP/InP light-emitting diodes with 60 MHz bandwidth are studied. Modulation and error rate characteristics at 100 Mbit/s are reported.
Two-dimensional high-speed acoustic Fourier transform of optical images
- Author(s): H. Gautier ; P. Ledu ; C. Maerfeld
- Source: Electronics Letters, Volume 15, Issue 6, p. 177 –178
- DOI: 10.1049/el:19790124
- Type: Article
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p.
177
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We employ a two-dimensional (2D) semiconductor acoustic convolver to generate the Fourier transform of 2D images. The transformed plane is raster-scanned along oblique lines with variable tilt angle, and the line time can vary from a few microseconds upwards.
Low-to-high voltage-level shifter and waveform synthesiser
- Author(s): C.J. Georgopoulos
- Source: Electronics Letters, Volume 15, Issue 6, p. 178 –179
- DOI: 10.1049/el:19790125
- Type: Article
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p.
178
–179
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This letter describes a method of voltage-level shifting and waveform synthesising achieved by a relatively simple, but novel, circuit and a single 5 V power supply. Such a circuit is useful in providing sustaining voltage for a plasma display panel, monitoring voltage levels for a digital t.v. display, successive triggering of threshold devices and for other applications.
Amorphous-silicon field-effect device and possible application
- Author(s): P.G. le Comber ; W.E. Spear ; A. Ghaith
- Source: Electronics Letters, Volume 15, Issue 6, p. 179 –181
- DOI: 10.1049/el:19790126
- Type: Article
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179
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The characteristics of an insulated-gate field-effect transistor made from amorphous silicon (a-Si) deposited in a glow discharge are discussed. It is suggested that the a-Si device could be applied with advantage in an addressable matrix of a liquid-crystal display panel.
Satellite slant-path attenuation statistics obtained using 20 and 30 GHz passive radiometers at Martlesham Heath
- Author(s): R.R. Bell and J. Thirlwell
- Source: Electronics Letters, Volume 15, Issue 6, p. 181 –183
- DOI: 10.1049/el:19790127
- Type: Article
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p.
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Radiometer data collected at Martlesham Heath is presented for the period August 1975 to July 1976, showing that significant fading (> 10 dB) can occur along 20 and 30 GHz satellite slant-paths at 23° elevation for durations in excess of 10 min.
Checking of square-law detectors used in Hartshorn and Ward dielectric measurements
- Author(s): R.N. Clarke
- Source: Electronics Letters, Volume 15, Issue 6, p. 183 –184
- DOI: 10.1049/el:19790128
- Type: Article
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It is shown that the ratio of resonance widths test, which is intended to check the square law of detectors used in Hartshorn and Ward measurements, does not give positive proof of compliance to a square-law characteristic. It is further shown that this test is insensitive to a likely form of departure from square law, which will give rise to errors in both conductance and loss-tangent measurements. An example is provided and general conclusions are drawn relating to the experimental verification of the compliance of detectors to a theoretical law.
Laser annealing of m.o.s.-transistor channel implantations
- Author(s): G. Zimmer
- Source: Electronics Letters, Volume 15, Issue 6, p. 184 –186
- DOI: 10.1049/el:19790129
- Type: Article
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184
–186
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Laser annealing of the implanted gate region of n-channel m.o.s. transistors is described. The threshold shift against dose is measured for laser-annealed and thermally annealed samples. Comparison with theoretical threshold shift shows that laser annealing yields full electrical activation without diffusive redistribution, in contrast to thermal annealing at 960°C.
Two-dimensional acoustic scanning of optical images
- Author(s): H. Gautier ; P. Ledu ; C. Maerfeld
- Source: Electronics Letters, Volume 15, Issue 6, p. 186 –187
- DOI: 10.1049/el:19790130
- Type: Article
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p.
186
–187
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We report a new surface-acoustic-wave (s.a.w.) device of the separated media convolver type. Waves are launched along two perpendicular axes and they perform a diagonal raster scan of the semiconductor surface. Two-dimensional images of 6×6 points with 1.5 μs line duration have been obtained.
High-performance aperiodic frequency multiplying
- Author(s): R. Konn and R. Genin
- Source: Electronics Letters, Volume 15, Issue 6, p. 187 –189
- DOI: 10.1049/el:19790131
- Type: Article
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p.
187
–189
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A circuit is described that multiplies the frequency of a sinusoidal signal by a factor of 3 (and even of 5) yet maintains the input/output amplitude ratio strictly constant over a large range. A special translinear configuration was designed and used, together with commercially available analogue multipliers, to build the circuit. Experimental measurements are presented to illustrate its interesting performance.
Efficient transforms for multidimensional convolutions
- Author(s): B. Arambepola and P.J.W. Rayner
- Source: Electronics Letters, Volume 15, Issue 6, p. 189 –190
- DOI: 10.1049/el:19790132
- Type: Article
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p.
189
–190
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A discrete transform is described for the computation of multidimensional convolutions often encountered in image and array-processing applications. The transform is free of multiplications in all dimensions but one, and has all advantages claimed by the d.f.t. methods.
Very easily testable/diagnosable sequential machine
- Author(s): A. Bhattacharyya
- Source: Electronics Letters, Volume 15, Issue 6, p. 190 –191
- DOI: 10.1049/el:19790133
- Type: Article
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p.
190
–191
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This letter is an extension of the works of Fujiwara et al. Based on the principle of machine modification through augmentation of extra inputs and outputs, it develops an approach of fault detection taking into consideration the faults occurring in the machine which may cause an increase in its number of states. Further, in this method, the checking sequence can also be reduced in length.
Simple modification to circuit enumeration algorithm for better efficiency
- Author(s): J.P. Char and S.D. Dadheech
- Source: Electronics Letters, Volume 15, Issue 6, p. 191 –192
- DOI: 10.1049/el:19790134
- Type: Article
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p.
191
–192
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A simple modification has been suggested to improve the efficiency of the existing algorithms for circuit enumeration, based on vector-space method. A large saving in labour is attained in the case of graphs with higher order of density, with this modification.
Multiposition optical-fibre switch
- Author(s): W.J. Tomlinson ; R.E. Wagner ; A.R. Strnad ; F.A. Dunn
- Source: Electronics Letters, Volume 15, Issue 6, p. 192 –194
- DOI: 10.1049/el:19790135
- Type: Article
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p.
192
–194
(3)
We describe a compact simple multiposition switch for multimode optical fibres. The switch uses a single graded refractive-index (g.r.i.n.-rod) lens and a rotating reflector to scan an image of the input fibre over a circular array of output fibres.
Measurement and simulation of satellite systems single-channel-per-carrier frequency-modulation spectra
- Author(s): B.G. Evans ; H. Ganem ; J. Dutronc
- Source: Electronics Letters, Volume 15, Issue 6, p. 194 –196
- DOI: 10.1049/el:19790136
- Type: Article
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–196
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Experimental measurements of the spectrum of an s.c.p.c/f.m. satellite communication carrier both with and without syllabic companders are presented. The variability of the spectra for different talkers, talker levels and activity ratios of speech are also reported. A novel form of simulation of the spectra, which opens the way to fast and economic successive convolution of spectra for use in intermodulation and interference, is proposed.
Discrete Fourier transform of correlation functions
- Author(s): J.R. Jordan
- Source: Electronics Letters, Volume 15, Issue 6, p. 196 –197
- DOI: 10.1049/el:19790137
- Type: Article
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p.
196
–197
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The Van Vleck equation relating the polarity correlation function to the direct correlation function is used to derive a new algorithm for the evaluation of the discrete Fourier transform of the direct correlation function. Application of an implementation of the algorithm to correlation-based measurement is discussed.
Extending the low-frequency range of GaAs f.e.t. broadband microwave amplifiers using microstrip transmission lines
- Author(s): C.M. Krowne
- Source: Electronics Letters, Volume 15, Issue 6, p. 197 –198
- DOI: 10.1049/el:19790138
- Type: Article
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p.
197
–198
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A new microwave circuit technique is introduced to extend the frequency range of high-frequency GaAs m.e.s.f.e.t.s into the neighbourhood of 2 GHz so that wide-band amplifiers may be developed. The negative-feedback technique reduces |s11| sufficiently yet allows the other s-parameters to remain approximately the same, permitting the design of high-performance wide-band amplifiers. One such design is discussed.
Evidence of collector-base junction burst noise
- Author(s): K.F. Knott
- Source: Electronics Letters, Volume 15, Issue 6, p. 198 –199
- DOI: 10.1049/el:19790139
- Type: Article
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p.
198
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Evidence has been found of collector-base (c.b.) junction burst noise. It is a much rarer phenomenon than emitter-base junction noise, having been found in only two samples from a batch of 100 noisy devices. Studies have been made of two devices from a 4-transistor array, one device exhibiting c.b. noise and the other e.b. noise.
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