Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 14, Issue 2, 19 January 1978
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Volume 14, Issue 2
19 January 1978
The effect of surface preparation on voltage threshold in liquid crystal phase-change cells
- Author(s): J.C. Varney and L.E. Davis
- Source: Electronics Letters, Volume 14, Issue 2, p. 25 –26
- DOI: 10.1049/el:19780018
- Type: Article
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The threshold behaviour of cholesteric to nematic phase-change cells with homogeneous and homeotropic surface alignment is compared. The former raises, the latter lowers, the threshold voltage. Departures from predicted linearity are seen when the cholesteric pitch is comparable with the film thickness.
Optical image scanning by electronic control of surface acoustic wave attenuation in CdS
- Author(s): Z. Ueda ; J. Shirafuji ; Y. Inuishi
- Source: Electronics Letters, Volume 14, Issue 2, p. 26 –28
- DOI: 10.1049/el:19780019
- Type: Article
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A new technique of reading optical images in a CdS surface acoustic wave delay line is presented. The principle is based on controlling surface-acoustic wave propagation loss by applied gate bias.
Fault detection in sequential machines with increased fault coverage
- Author(s): S.R. Das and A. Bhattacharyya
- Source: Electronics Letters, Volume 14, Issue 2, p. 28 –29
- DOI: 10.1049/el:19780020
- Type: Article
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This letter develops an approach for fault detection and checking sequence design of sequential machines based on the principle of machine modification through augmentation of extra input and extra outputs, taking into consideration the case where faults occurring in a machine may cause an increase in its number of states.
Medium power 12–18 GHz amplifier module
- Author(s): Karl B. Niclas
- Source: Electronics Letters, Volume 14, Issue 2, p. 29 –30
- DOI: 10.1049/el:19780021
- Type: Article
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Broadband Ku-band amplification has been extended into the range of medium power levels. A single-ended 100 mW amplifier stage has been developed for the 12–18 GHz frequency band using a GaAs Schottky-barrier field-effect transistor. Minimum gain at 20 dBm of output power was 4dB. When operating in the driver mode, a minimum gain of 5dB at an output power of 15 dBm was measured across Ku-band. Higher gains can easily be achieved by cascading several of these amplifier stages. Gain, output power and impedance characteristics as a function of frequency are discussed.
1/f noise and resistance between circular electrodes
- Author(s): L.K.J. Vandamme and J.C.F. Groot
- Source: Electronics Letters, Volume 14, Issue 2, p. 30 –32
- DOI: 10.1049/el:19780022
- Type: Article
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Results are presented of calculations and experiments for the relative 1/f noise C and the resistance R between circular contact electrodes on a 2-dimensional conductor. The results can also be used for 3-dimensional conductors such as ionic solutions with a pair of parallel cylindrical electrodes of the same length. The experimental results on carbon sheet conductors are in good agreement with the calculated values.
Power attenuation in bent multimode step-index slab and fibre waveguides
- Author(s): J.D. Love and C. Winkler
- Source: Electronics Letters, Volume 14, Issue 2, p. 32 –34
- DOI: 10.1049/el:19780023
- Type: Article
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The power attenuation induced by a circular bend in the waveguide axis is calculated using ray tracing and a generailsed power-transmission coefficient for the case of diffuse illumination.
On pole assignment by proportional-plus-derivative output feedback
- Author(s): P.N. Paraskevopoulos
- Source: Electronics Letters, Volume 14, Issue 2, p. 34 –36
- DOI: 10.1049/el:19780024
- Type: Article
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Two time-domain design techniques are presented for pole assignment using proportional-plus-derivative output feedback. The present results appear to be more general and computationally simpler over known techniques.
Three-valued c.m.o.s. cycling gates
- Author(s): H.T. Mouftah and K.C. Smith
- Source: Electronics Letters, Volume 14, Issue 2, p. 36 –37
- DOI: 10.1049/el:19780025
- Type: Article
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The design of three-valued cycling gates with c.m.o.s. integrated circuits is presented. Circuits for the cycling and the inverse cycling gates prove to be simpler than those previously reported.
Envelope-constrained time-domain deconvolution for transversal-filter equalisers
- Author(s): D. Preis
- Source: Electronics Letters, Volume 14, Issue 2, p. 37 –38
- DOI: 10.1049/el:19780026
- Type: Article
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A deconvolution algorithm is presented for calculating the N tap weights of a transversal-filter equaliser. The procedure attempts to control the size of individual, time-domain response errors rather than simply minimise total mean-square error of the response. A least-square error solution for the tap weights is iteratively modified, using only elementary algebraic matrix operations, in an effort to satisfy tolerance constraints on the envelope of the equalised impulse response. The algorithm is suitable for digital computation.
Worst-month statistics
- Author(s): R.K. Crane and W.E. Debrunner
- Source: Electronics Letters, Volume 14, Issue 2, p. 38 –40
- DOI: 10.1049/el:19780027
- Type: Article
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The concept of the worst month is of importance to the designers of telecommunication systems who have to meet percentage of ‘any month’ performance criteria. This letter provides a definition of the worst month and presents a procedure for the estimation of worst-month statistics based on a series of monthly values for the probability (percentage of time) of exceeding a preselected threshold. A procedure is also presented for relating worst-month statistics to average annual statistics.
Range estimation from random array phase measurements
- Author(s): S.A. Kassam and Y. Shamash
- Source: Electronics Letters, Volume 14, Issue 2, p. 40 –42
- DOI: 10.1049/el:19780028
- Type: Article
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Estimation of the location of a source of radiation from antenna-array phase measurements is considered. A least-squares technique for estimation is analysed for performance.
A new technique for improving the acquisition performance of second-order phase-locked loops
- Author(s): J.P. McGeehan
- Source: Electronics Letters, Volume 14, Issue 2, p. 42 –43
- DOI: 10.1049/el:19780029
- Type: Article
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In this letter a simple technique for improving the acquisition performance of all second-order phase-locked loops is described. The method overcomes many of the limitations of previous techniques and can be easily incorporated into existing systems. Preliminary results are described.
Frequency response of 2-dimensional digital filters
- Author(s): K.P. Prasad and P.S. Reddy
- Source: Electronics Letters, Volume 14, Issue 2, p. 43 –45
- DOI: 10.1049/el:19780030
- Type: Article
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A state-space representation of an elementary 2-dimensional digital network is presented. The problem of determining the frequency response starting from its state-space equation is reduced to solving two sets of linear simultaneous equations in real unknowns at each pair of frequencies. The efficiency and the computational aspects of the proposed method are also discussed.
Cascade synthesis of monolithic crystal filters with transmission zeros at finite frequencies
- Author(s): S.K.S. Lu
- Source: Electronics Letters, Volume 14, Issue 2, p. 45 –46
- DOI: 10.1049/el:19780031
- Type: Article
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This paper describes a method of cascade synthesis to realise filter response, with transmission zeros at finite frequencies, using dual monolithic-crystal filters with bridging and series connected capacitors.
Erratum: Hand-held tool for optical-fibre end preparation
- Author(s): J.E. Fulenwider and M.L. Dakss
- Source: Electronics Letters, Volume 14, Issue 2, page: 46 –46
- DOI: 10.1049/el:19780032
- Type: Article
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Erratum: Nonlinear theory of long-range-interaction resonant generators
- Author(s): A.A. Shmat'Ko ; O.A. Tretyakov ; D.M. Vavriv
- Source: Electronics Letters, Volume 14, Issue 2, page: 46 –46
- DOI: 10.1049/el:19780033
- Type: Article
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