Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 6, 17 March 1977
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Volume 13, Issue 6
17 March 1977
Phase filtering with time reversal
- Author(s): P.B. Fellgett
- Source: Electronics Letters, Volume 13, Issue 6, page: 153 –153
- DOI: 10.1049/el:19770108
- Type: Article
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153
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Correction of phase shift by time-reversal recording is discussed from a unified viewpoint, including considerations of physical realisability, time delay and a systematic approach to practical application.
Nylon-jacketed optical fibre with silicone buffer layer
- Author(s): T. Naruse ; Y. Sugawara ; K. Masuno
- Source: Electronics Letters, Volume 13, Issue 6, p. 153 –154
- DOI: 10.1049/el:19770109
- Type: Article
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–154
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We have developed an optical fibre having a silicone buffer layer which is stable against various environmental attacks. The transmission loss of the fibre after cabling was only 2.3 dB/km at 0.85 μm.
Improved Hamming-distance analysis for digital learning networks
- Author(s): T.J. Stonham
- Source: Electronics Letters, Volume 13, Issue 6, p. 155 –156
- DOI: 10.1049/el:19770110
- Type: Article
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–156
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A method for calculating the response of a single-layer network pattern-recognition system is presented. To obtain accurate prediction of the network response, it is necessary to consider the Hamming distances between training patterns. The method is demonstrated with reference to an alphanumeric recognition test.
Low-temperature f.e.t. for low-power high-speed logic
- Author(s): H. Rees ; G.S. Sanghera ; R.A. Warriner
- Source: Electronics Letters, Volume 13, Issue 6, p. 156 –158
- DOI: 10.1049/el:19770111
- Type: Article
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–158
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A novel f.e.t. cooled to around 100 K is proposed. Detailed computer simulations support the conjecture of high-speed switching at low power levels with a power-delay product ≃ 10−14 J.
Linearisation of optical transmitters by a quasifeedforward compensation technique
- Author(s): J. Straus and O.I. Szentesi
- Source: Electronics Letters, Volume 13, Issue 6, p. 158 –159
- DOI: 10.1049/el:19770112
- Type: Article
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–159
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A quasifeedforward linearisation scheme is described suitable for linearisation of optical transmitters using GaAlAs double heterostructure Burrus-type light emitting diodes. Experimentally, an improvement was observed of, respectively, 33 dB and 17 dB in 2nd and 3rd order distortion for a figure of −70 dB down on fundamental at 100 mA d.c, 100 mA peak-to-peak modulation currents.
K-band f.e.t. amplifiers
- Author(s): M.M. Nowak ; P.A. Terzian ; R.D. Fairman
- Source: Electronics Letters, Volume 13, Issue 6, p. 159 –160
- DOI: 10.1049/el:19770113
- Type: Article
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–160
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Single-stage f.e.t. amplifiers operating in K-band have been constructed using the Varian VSX 9305 0.5 μm-gate GaAs f.e.t. An amplifier gain of 9±1 dB was obtained over the frequency band 18.5–20.5 GHz and gain of 8±1 dB was observed from 23.0 to 26.0 GHz. An amplifier noise figure of 5.6 dB was measured at 24 GHz.
Effects of microstrip discontinuities on GaAS-m.e.s.f.e.t.-amplifier gain performance
- Author(s): R.J. Akello ; B. Easter ; I.M. Stephenson
- Source: Electronics Letters, Volume 13, Issue 6, p. 160 –162
- DOI: 10.1049/el:19770114
- Type: Article
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–162
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The effects of microstrip step and crossover discontinuity reactances on GaAs-m.e.s.f.e.t.-amplifier gain performance are assessed by using computer simulation. The results clearly show that the effects of these discontinuities are significant and must therefore be allowed for if performance close to the predicted design is to be achieved.
Nonlinear phase distortion and its compensation in l.e.d. direct modulation
- Author(s): K. Asatani and T. Kimura
- Source: Electronics Letters, Volume 13, Issue 6, p. 162 –163
- DOI: 10.1049/el:19770115
- Type: Article
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–163
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Differential phase distortion of the light-emitting diode is measured and analysed. An effective technique is proposed to compensate the d.p. distortion. An experimental result shows that 2.8° d.p. distortion has been reduced to within 1°.
Design aid for approximate p.d. and p.i.d. on/off controllers
- Author(s): E.M. Stafford
- Source: Electronics Letters, Volume 13, Issue 6, p. 163 –164
- DOI: 10.1049/el:19770116
- Type: Article
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–164
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The graphical construction given aids controller design and the understanding of the controller mechanism.
Multipliers for residue-number-arithmetic digital filters
- Author(s): M.A. Soderstrand and E.L. Fields
- Source: Electronics Letters, Volume 13, Issue 6, p. 164 –166
- DOI: 10.1049/el:19770117
- Type: Article
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A recently proposed residue-number-arithmetic digital filter offers major cost and speed advantages over binary-arithmetic digital filters, but suffers one major drawback. The filter coefficients must be constant, since the lack of a fast method of multiplication by a fraction in residue arithmetic requires the coefficients to be realised by a fixed table look-up read-only memory. Two multipliers are proposed which realise a completely general fractional multiply and are suitable for digital-filtering applications.
Computing the minimal polynomial by using Koenig's theorem
- Author(s): Y. Shamash
- Source: Electronics Letters, Volume 13, Issue 6, p. 166 –167
- DOI: 10.1049/el:19770118
- Type: Article
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An algorithm is given to determine the transfer function or minimal realisation of a finite-dimensional linear time-invariant system from its Markov parameters or time moments. The method makes a direct computation of the minimal polynomial by using Koenig's theorem.
Additional generalisation scheme of active RC allpass filters
- Author(s): D. Patranabis and M.P. Tripathi
- Source: Electronics Letters, Volume 13, Issue 6, p. 167 –168
- DOI: 10.1049/el:19770119
- Type: Article
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A generalisation scheme of the active RC allpass networks with one differential input operational amplifier and three RC 2-ports is presented. The 2-ports are unbalanced, but not earthed, and only the voltage transfer functions of these networks are used in this generalisation, thus making the analysis of the circuit and the circuit transfer functions considerably easier.
Addendum: Enhancement-mode GaAs m.o.s.f.e.t. on semi-insulating substrate using a self-aligned gate technique
- Author(s): E. Kohn and A. Colquhoun
- Source: Electronics Letters, Volume 13, Issue 6, page: 168 –168
- DOI: 10.1049/el:19770120
- Type: Article
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Erratum: Search procedure for efficient superdirective array and image enhancement functions
- Author(s): A.P. Anderson ; M.M. Dawoud ; J.C. Bennett ; P.D. Patel
- Source: Electronics Letters, Volume 13, Issue 6, page: 168 –168
- DOI: 10.1049/el:19770121
- Type: Article
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Erratum: Improving the large-signal models of bipolar transistors by dividing the intrinsic base into two lateral sections
- Author(s): H.-M. Rein
- Source: Electronics Letters, Volume 13, Issue 6, page: 168 –168
- DOI: 10.1049/el:19770122
- Type: Article
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