Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 6, 22 March 1973
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Volume 9, Issue 6
22 March 1973
Adaptive control of a flexible linear array
- Author(s): P.L. O'Donovan and A.W. Rudge
- Source: Electronics Letters, Volume 9, Issue 6, p. 121 –122
- DOI: 10.1049/el:19730089
- Type: Article
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–122
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A system has been constructed which adaptively corrects for an applied phase error along the length of a flexible linear array. The system utilises resistance strain gauges and electrically controlled ferrite phase shifters. Results at 9.4 GHz are presented, in the form of radiation patterns, to provide an illustration of the system performance.
Improvements in circuit realisation of threshold-logic gates
- Author(s): S.L. Hurst
- Source: Electronics Letters, Volume 9, Issue 6, p. 123 –124
- DOI: 10.1049/el:19730090
- Type: Article
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The design and performance of a circuit with improved tolerance to high binary input voltages are discussed, which would cause input-current switch saturation and wrong current summation in existing gates. Compatibility with conventional transistor–transistor logic gates is maintained, and the additional circuit complexity per gate is minimal for monolithic-integrated-circuit realisations.
Optimum source admittance matching for low-noise receivers without transformer
- Author(s): R. Käesser
- Source: Electronics Letters, Volume 9, Issue 6, p. 124 –125
- DOI: 10.1049/el:19730091
- Type: Article
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The noise behaviour for various connections of two 2-ports has been theoretically considered previously. A generalisation of the results yields an equation for the noise factor of n parallel 2-ports. It follows from this equation that the optimum source admittance for low-noise receivers can be matched without a transformer, a fact which may be very useful in the v.h.f. and u.h.f. ranges, where lossless impedance transformation is difficult.
n- and p-channel m.o.s.f.e.t.s as Rayleigh-surface-wave detectors
- Author(s): PH. Defranould
- Source: Electronics Letters, Volume 9, Issue 6, p. 125 –126
- DOI: 10.1049/el:19730092
- Type: Article
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We have studied the piezoresistance effect in an m.o.s.f.e.t. structure used as a Rayleigh-surface-wave transducer. The investigation was carried out over a large frequency range about a central value of 100 MHz. Results for silicon–m.o.s.f.e.t. n- and p- channel inversion layers are given.
Calibration of microwave network analyser for computer-corrected S parameter measurements
- Author(s): E.F. da Silva and M.K. McPhun
- Source: Electronics Letters, Volume 9, Issue 6, p. 126 –128
- DOI: 10.1049/el:19730093
- Type: Article
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A new method of calibration that uses three short-circuits (one direct and two offset short-circuits) enables the scattering parameters of the error network to be evaluated, and makes corrected measurements of the reflection coefficients possible without requiring the use of matched terminations. The theoretical results are confirmed by experimental results.
Photovoltaic junctions formed on silk-screened cadmium-sulphide layers
- Author(s): S. Vojdani ; A. Sharifnai ; M. Doroudian
- Source: Electronics Letters, Volume 9, Issue 6, p. 128 –129
- DOI: 10.1049/el:19730094
- Type: Article
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Methods for making cadmium-sulphide photovoltaic junctions which are based on polycrystalline semiconductor layers of cadmium sulphide deposited by a silk-screening technique have been developed, and some experimental results on their electrical characteristics are reported. The methods employed in the preparation of these junctions avoid the difficulties involved in producing large-area CdS solar cells by evaporation in vacuum.
Tungsten masking against boron implantation
- Author(s): W.M. Portnoy and L.M. Leedy
- Source: Electronics Letters, Volume 9, Issue 6, p. 129 –130
- DOI: 10.1049/el:19730095
- Type: Article
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Electron-beam evaporated and ion-beam sputtered films have been successfully used as masks against high-dosage boron implantation. Evaporated films were found to be somewhat more effective, probably because of their higher density. The predicted value for the required mask thickness was in satisfactory agreement with the experimentally determined value.
New family of nematic liquid crystals for displays
- Author(s): G.W. Gray ; K.J. Harrison ; J.A. Nash
- Source: Electronics Letters, Volume 9, Issue 6, p. 130 –131
- DOI: 10.1049/el:19730096
- Type: Article
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New organic compounds of positive dielectric anisotropy giving nematic liquid crystals at room temperature, either as the pure compounds or in admixture, are described. These materials are of improved stability, and function well in electro-optical devices based on the twisted-nematic or cholesteric-nematic phase-change effects.
High-accuracy digital–analogue convertor
- Author(s): S. Marjanović
- Source: Electronics Letters, Volume 9, Issue 6, p. 131 –132
- DOI: 10.1049/el:19730097
- Type: Article
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High-precision constant-current sources of a novel design, based upon super beta integrated operational amplifiers, are used with the inverted ladder network to implement a classical digital–analogue-convertor configuration with an accuracy better than 0.01% over the full temperature range without external trimming.
Accurate calculation of device heat dynamics: a special feature of the TRANS-TRAN circuit-analysis program
- Author(s): V. Székely
- Source: Electronics Letters, Volume 9, Issue 6, p. 132 –134
- DOI: 10.1049/el:19730098
- Type: Article
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An exact method for solving coupled electronic–thermal networks, such as circuits containing semiconductor devices, is presented. The algorithm proposed here for the d.c., a.c. and transient solutions is a generalisation of the d.c. ‘simultaneous-solution’ method published earlier. Finally, an example is given to illustrate the significance of mostly neglected thermal effects.
Comment on ‘Determination of the velocity/field characteristic for n-type indium phosphide from dipole-domain measurements’
- Author(s): P.M. Boers
- Source: Electronics Letters, Volume 9, Issue 6, p. 134 –135
- DOI: 10.1049/el:19730099
- Type: Article
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Recently published results of measurements on the velocity/field characteristic of indium phosphide by Prew do not agree with measurements of other authors. Suggestions are made for explaining the discrepancies. Prew's criticism on earlier work and on microwave experiments by other authors is also met.
M.O.S. bucket-brigade AND–OR logic array
- Author(s): T.D. Mok and C.A.T. Salama
- Source: Electronics Letters, Volume 9, Issue 6, p. 135 –136
- DOI: 10.1049/el:19730100
- Type: Article
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An integrated m.o.s. bucket-brigade logic array capable of performing both AND and OR functions is described. The operation of the array is discussed and experimental results are presented.
Analysis of the surface-acoustic-wave crossbar coupler
- Author(s): P.V.H. Sabine
- Source: Electronics Letters, Volume 9, Issue 6, p. 136 –138
- DOI: 10.1049/el:19730101
- Type: Article
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An analysis of the scattering of surface acoustic waves at a region of periodic surface mass loading is presented. Experimental measurements of the scattered-wave amplitudes show close agreement with theoretical calculations.
Surface-acoustic-wave filters employing symmetric phase-weighted transducers
- Author(s): M.F. Lewis
- Source: Electronics Letters, Volume 9, Issue 6, p. 138 –140
- DOI: 10.1049/el:19730102
- Type: Article
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The letter describes a phase-weighting scheme for use in nondispersive surface-acoustic-wave bandpass filters. The advantages of this scheme are enumerated, and the performance of a demonstration filter on ST-quartz is compared with theoretical predictions.
Zero-steering antenna system for receiving a signal close to the direction of strong interference
- Author(s): D.C. Cooper
- Source: Electronics Letters, Volume 9, Issue 6, p. 140 –141
- DOI: 10.1049/el:19730103
- Type: Article
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140
–141
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The suppression of a large interfering signal received with a small wanted signal can be achieved by automatically steering a directional-response zero towards the interference direction. A simple method for controlling the zero position is considered, and the system performance is estimated for two possible modes of operation.
Injection-locked IMPATT oscillators applied to f.d.m. microwave transmission
- Author(s): H.B. Wood
- Source: Electronics Letters, Volume 9, Issue 6, p. 141 –142
- DOI: 10.1049/el:19730104
- Type: Article
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The noise, locking bandwidth and gain characteristics of the injection-locked IMPATT amplifier are discussed and related to the requirement for f.d.m. telephone transmission over microwave circuits. It is shown that the unloaded noise produced by the IMPATT diode limits its application to low-gain operation in medium-capacity radio links, although the gain obtainable can be improved by employing multistage amplifiers.
Sequential generators using read-only memories
- Author(s): J.C. Laprie and M. Souny
- Source: Electronics Letters, Volume 9, Issue 6, p. 142 –143
- DOI: 10.1049/el:19730105
- Type: Article
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A sequential generator for the chainig for logic or arithmetic functions is described which uses low-cost and fast-access-time read-only memories. The generator proposed enables memory capacity to be considerably reduced by use of a multiplexer and an adder, and is claimed to give a considerable time saving over classical methods.
Optimisation of delay and risetime in iterative multistage wideband amplifier circuits
- Author(s): Arpad Barna
- Source: Electronics Letters, Volume 9, Issue 6, p. 143 –145
- DOI: 10.1049/el:19730106
- Type: Article
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Criteria are derived for minimising the overall delay and risetime of the step-function response in iterative multistage wideband amplifier circuits. The treatment takes into account collector–base capacitances, and it provides explicit results suitable for use in circuit design.
Accumulation-layer surface-wave convolver
- Author(s): J.M. Smith ; E. Stern ; Abraham Bers
- Source: Electronics Letters, Volume 9, Issue 6, p. 145 –146
- DOI: 10.1049/el:19730107
- Type: Article
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A new type of coupled silicon–lithium-niobate convolver is reported, in which a known accumulation layer of electrons was produced at the silicon surface. By applying a normal electric field, the electron density was varied, and the convolution signal was a strong function of this surface charge density.
Radiation properties of a composite-dielectric-rod aerial
- Author(s): J.R. Blakey
- Source: Electronics Letters, Volume 9, Issue 6, p. 146 –147
- DOI: 10.1049/el:19730108
- Type: Article
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A series of radiation-pattern measurements have been carried out on a composite cylindrical dielectric-rod aerial structure Comparison with the pattern of a uniform cylindrical rod excited in the HE11 mode shows that the composite structure has a higher gain over a considerable frequency range. These results are not readily explained on the basis of currently accepted radiation-pattern formulas for the dielectric-rod aerial.
Precision differential voltage–current convertor
- Author(s): Raimondo Caprio
- Source: Electronics Letters, Volume 9, Issue 6, p. 147 –148
- DOI: 10.1049/el:19730109
- Type: Article
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A new differential voltage–current convertor is proposed, which achieves high linearity and is substantially temperature independent. The effects of transistor mismatches and of limited current gain are analysed. Experimental results are given which show a considerable improvement over previous circuits.
Ultralow-diffraction acoustic-surface-wave propagation on Bi12GeO20
- Author(s): A.J. Slobodnik and T.L. Szabo
- Source: Electronics Letters, Volume 9, Issue 6, p. 149 –150
- DOI: 10.1049/el:19730110
- Type: Article
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A range of acoustic-surface-wave orientations on Bi12GeO20 is described, allowing optimum-beam-steering diffraction tradeoffs. An orientation for acoustic-surface-wave propagation on Bi12GeO20 has been discovered having at least two orders of magnitude less diffraction than isotropic materials.
Leaky-wave analysis of optical periodic couplers
- Author(s): S.T. Peng ; T. Tamir ; H.L. Bertoni
- Source: Electronics Letters, Volume 9, Issue 6, p. 150 –152
- DOI: 10.1049/el:19730111
- Type: Article
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A rigorous analysis of an optical beam coupler of the periodic variety is presented in terms of a leaky-wave formulation. The particular case of a surface wave producing one or two beams, and the partition of the available energy between these beams, are considered.
Erratum: More aspects of quantisation noise associated with digital coding of colour-television signals
- Author(s): L. Verhoeven
- Source: Electronics Letters, Volume 9, Issue 6, page: 152 –152
- DOI: 10.1049/el:19730112
- Type: Article
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Erratum: Economical RC active lossy ladder filters
- Author(s): J.M. Rollett
- Source: Electronics Letters, Volume 9, Issue 6, page: 152 –152
- DOI: 10.1049/el:19730113
- Type: Article
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