Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 12, 13 June 1974
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Volume 10, Issue 12
13 June 1974
Surface-quality effects on s.a.w. attenuation on yz LiNbO3
- Author(s): A.J. Slobodnik Jun
- Source: Electronics Letters, Volume 10, Issue 12, p. 233 –234
- DOI: 10.1049/el:19740180
- Type: Article
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p.
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–234
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Quantitative experimental results of the effect of surface and crystalline quality on acoustic-surface-wave attenuation on yz lithium niobate are presented. All data were taken at room temperature and at approximately 1.9 GHz. Surface roughness of the order of 0.25 wavelength causes an approximately 50% increase in the surface-wave attenuation.
Overlength modes of InP transferred-electron devices
- Author(s): D. Jones and H.D. Rees
- Source: Electronics Letters, Volume 10, Issue 12, p. 234 –235
- DOI: 10.1049/el:19740181
- Type: Article
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p.
234
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Simulations of overlength modes in InP transferred-electron devices indicate microwave conversion efficiencies greater than 25%. The maximum frequency of operation exceeds 20 GHz. but depends markedly on the nature of the electronic intervalley scattering processes and associated relaxation effects.
Picosecond mode delays in gradient-refractive-index fibres
- Author(s): F.P. Kapron
- Source: Electronics Letters, Volume 10, Issue 12, p. 235 –237
- DOI: 10.1049/el:19740182
- Type: Article
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–237
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The effect of refractive-index profiling in multimode fibres on modal time-delay differences and on modal wavelength dispersion is evaluated. The delay can be made negligible compared with the modal dispersion. The latter is comparable in magnitude, but opposite in sign, to glass dispersion.
Fast b.c.d. multiplier
- Author(s): D.P. Agrawal
- Source: Electronics Letters, Volume 10, Issue 12, p. 237 –238
- DOI: 10.1049/el:19740183
- Type: Article
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A fast b.c.d. multiplier is proposed, based on obtaining the product of a 1-digit multiplicand and a 1-digit multiplier in a single row of adders. For high-speed operation, the carry-save technique universally adopted for binary multipliers, is used.
Feedback stability of open-loop unstable systems: contraction-mapping approach
- Author(s): D.H. Owens
- Source: Electronics Letters, Volume 10, Issue 12, p. 238 –239
- DOI: 10.1049/el:19740184
- Type: Article
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p.
238
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Recent results obtained by Freeman on the stability of linear multivariable feedback systems using the concept of contraction mapping are extended to include open-loop unstable plants. A consequence of the results is a new form of Rosenbrock's stability criterion for open-loop unstable minimum-phase systems.
Measurements on waveguide properties of GeO2-SiO2-cored optical fibres
- Author(s): P.W. Black ; J. Irven ; K. Byron ; I.S. Few ; R. Worthington
- Source: Electronics Letters, Volume 10, Issue 12, p. 239 –240
- DOI: 10.1049/el:19740185
- Type: Article
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–240
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Total attenuation and scatter loss measurements have been made on optical-fibre waveguides produced with graded refractive-index profiles in GeO-2-SiO2 cores. The total attenuation of the fibres at semiconductor-laser wavelengths has been reduced to less than 4 dB/km.
Improvement of overflow behaviour of 2nd-order digital filters by means of error feedback
- Author(s): T. Claasen and L. Kristiansson
- Source: Electronics Letters, Volume 10, Issue 12, p. 240 –241
- DOI: 10.1049/el:19740186
- Type: Article
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In digital filters, nonlinear phenomena caused by adder overflow can occur. Some of these phenomena that have been observed in a 2nd-order recursive digital filter are mentioned. A circuit is described in which the error produced by overflow is delayed and fed back into the filter. It is shown that this circuit improves the overflow behaviour.
Tropospheric emission and attenuation statistics at 110 GHz
- Author(s): C.J. Gibbins
- Source: Electronics Letters, Volume 10, Issue 12, p. 241 –243
- DOI: 10.1049/el:19740187
- Type: Article
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The probability distribution of atmospheric emission noise from the zenith at 110 GHz has been measured by a radiometer at Slough, UK. The derived attenuations in the vertical direction exceed 13 and 6 dB for 0·5 and 5% of the time, respectively.
Direct method for pole assignment in single-input systems with output feedback
- Author(s): H. Seraji
- Source: Electronics Letters, Volume 10, Issue 12, p. 243 –244
- DOI: 10.1049/el:19740188
- Type: Article
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243
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A direct frequency-domain method of calculating the constant output feedback vector required for pole assignment in single-input systems is described. The method is illustrated by a numerical example.
Time-axis conversion with bucket-brigade delay lines
- Author(s): O. Hansen and D. Rebild
- Source: Electronics Letters, Volume 10, Issue 12, p. 244 –245
- DOI: 10.1049/el:19740189
- Type: Article
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The application of m.o.s. bucket-brigade shift registers to obtaining time-axis conversion is discussed. By alternately introducing information in one unit at one frequency and reading out a parallel unit at another frequency, multiplication of the signal frequency is achieved equal to the ratio of the input to the output frequency. Construction of a system for audio use is described, and the results obtained are presented.
Systematic search for optical Barker codes with minimum length
- Author(s): P.S. Moharir and A. Selvarajan
- Source: Electronics Letters, Volume 10, Issue 12, p. 245 –246
- DOI: 10.1049/el:19740190
- Type: Article
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A method that yields optical Barker codes of smallest known lengths for given discrimination is described.
Realisation of stored-program sequential machines
- Author(s): A.M.A. Hussain and M.E. Woodward
- Source: Electronics Letters, Volume 10, Issue 12, p. 246 –248
- DOI: 10.1049/el:19740191
- Type: Article
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A technique is proposed for the decomposition of stored-program sequential machines into nonloopfree structures. The resulting submachines are found to be of uniform or near-uniform structure, and can be realised from commercially available memory units, with little or no redundancy in storage requirements.
Erratum: Low-frequency impedance of a circular loop over a conducting ground
- Author(s): J.R. Wait and K.P. Spies
- Source: Electronics Letters, Volume 10, Issue 12, page: 248 –248
- DOI: 10.1049/el:19740192
- Type: Article
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Erratum: Site shielding for Earth-station antennas
- Author(s): M.A. Streete and D.H. Shinn
- Source: Electronics Letters, Volume 10, Issue 12, page: 248 –248
- DOI: 10.1049/el:19740193
- Type: Article
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Erratum: Probability-density function of output of single-bit cross-correlator for detecting Gaussian reflections in noise
- Author(s): J.E. Howard
- Source: Electronics Letters, Volume 10, Issue 12, page: 248 –248
- DOI: 10.1049/el:19740194
- Type: Article
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Erratum: Variable-frame-rate coding scheme for speech-analysis/synthesis systems
- Author(s): J.N. Holmes
- Source: Electronics Letters, Volume 10, Issue 12, page: 248 –248
- DOI: 10.1049/el:19740195
- Type: Article
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Erratum: Design of recursive digital filters approximating to arbitrary prescribed magnitude responses
- Author(s): P. Thajchayapong and P.J.W. Rayner
- Source: Electronics Letters, Volume 10, Issue 12, page: 248 –248
- DOI: 10.1049/el:19740196
- Type: Article
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