Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 20, 29 September 1977
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Volume 13, Issue 20
29 September 1977
Electronics Letters Premium
- Author(s): E.A. Ash and P.J.B. Clarricoats
- Source: Electronics Letters, Volume 13, Issue 20, page: 593 –593
- DOI: 10.1049/el:19770426
- Type: Article
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p.
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C.M.R.R. analysis of the 3-op-amp instrumentation amplifier
- Author(s): M.A. Smither ; D.R. Pugh ; L.M. Woolard
- Source: Electronics Letters, Volume 13, Issue 20, page: 594 –594
- DOI: 10.1049/el:19770427
- Type: Article
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594
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The c.m.r.r. performance of the 3-op-amp instrumentation amplifier is analysed and shown to be, in general, no better than that of a single-op-amp differential amplifier. Only under rather special conditions does the more elaborate amplifier have a c.m.r.r. advantage.
Inclusion of conductivity in silicon s.a.w. component design
- Author(s): A. Venema and R.F. Humphryes
- Source: Electronics Letters, Volume 13, Issue 20, p. 594 –596
- DOI: 10.1049/el:19770428
- Type: Article
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594
–596
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An equivalent circuit is described for a surface-acoustic-wave delay line utilising interdigital transducers in a multilayered medium with a conductive silicon substrate. Attention is paid to practical material parameters for the ultimate realisation of the monolithic integration of surface-acoustic-wave and electronic components on the same silicon slice.
Two-Josephson-junction interferometer memory cell for n.d.r.o.
- Author(s): H. Beha
- Source: Electronics Letters, Volume 13, Issue 20, p. 596 –598
- DOI: 10.1049/el:19770429
- Type: Article
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596
–598
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A single-flux-quantum random-access memory cell for nondestructive read-out and write has been designed and successfully simulated. The binary information is stored in an interferometer with two unequal Josephson junctions. No bias current is needed to store the information. Reasonable operation margins are obtained.
Performance evaluation of a general framing circuit using two N-stage shift registers
- Author(s): P.F. Lee ; Q.S. Chow ; P.E.K. Chow
- Source: Electronics Letters, Volume 13, Issue 20, p. 598 –599
- DOI: 10.1049/el:19770430
- Type: Article
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A general algorithm is presented for computing the average number of shifts per frame period (A) of a framing circuit which checks for N consecutive data bits for possible framing bit candidacy. A simulation program has also been written to compute A for N between 2 and 8.
Performance comparison of data windows
- Author(s): K.M.M. Prabhu ; V.U. Reddy ; J.P. Agrawal
- Source: Electronics Letters, Volume 13, Issue 20, p. 600 –601
- DOI: 10.1049/el:19770431
- Type: Article
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The parameters of various windows have been determined and the performance of the truncated Taylor family, the raisedcosine family, Kaiser's modified zeroth-order Bessel family, sum-cosine and Blackman windows have been compared.
Change of some properties of junction field-effect transistors after ionising irradiation
- Author(s): G. Dehmel and D. Bräunig
- Source: Electronics Letters, Volume 13, Issue 20, p. 601 –603
- DOI: 10.1049/el:19770432
- Type: Article
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Measurements of the increase of equivalent noise-voltage spectral densities and gate leakage currents of the j.f.e.t.s 2N5521 and 2N6483 after ionising irradiation are reported. After an absorbed dose of 107 rad (Si), the noise and gate current are increased by factors of up to 10 and 500, respectively.
Spark-induced fracture of optical fibres
- Author(s): P. Hensel
- Source: Electronics Letters, Volume 13, Issue 20, p. 603 –604
- DOI: 10.1049/el:19770433
- Type: Article
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603
–604
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Sparks can be used to induce the fracture of optical fibres under controlled conditions to prepare ends for low-loss joints. The material and geometry of the electrodes of the spark gap are found to have a pronounced effect on the efficiency of the technique.
Design of waveguide-to-microstrip transitions specially suited to millimetre-wave applications
- Author(s): L.J. Lavedan
- Source: Electronics Letters, Volume 13, Issue 20, p. 604 –605
- DOI: 10.1049/el:19770434
- Type: Article
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604
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A design procedure for millimetre waveguide-to-microstrip transitions is presented. The analysis is such that existing design information, readily available in practical curve format, can be directly applied. In addition, the procedure can be adapted to all physically realisable microstrip impedances, as well as substrate materials and thicknesses.
Material-dispersion-limited operation of high-bit-rate optical-fibre data links using l.e.d.s
- Author(s): W.M. Muska ; Tingye Li ; T.P. Lee ; A.G. Dentai
- Source: Electronics Letters, Volume 13, Issue 20, p. 605 –607
- DOI: 10.1049/el:19770435
- Type: Article
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Material dispersion generally limits the transmission capacity of optical-fibre data links using l.e.d.s. A 137 Mb/s data link has been operated by using either AlGaAs or InGaAsP l.e.d.s at 0.89 or 1.20 μm, respectively. ‘Eye’ diagrams of the received signal for transmission over different lengths of a graded-index germanium borosilicate fibre illustrate the effects of material dispersion.
Propagation characteristics of trapezoidal-cross-section ridge optical waveguides
- Author(s): P.M. Pelosi ; P. Vandenbulcke ; C.D.W. Wilkinson ; R.M. De La Rue
- Source: Electronics Letters, Volume 13, Issue 20, p. 607 –608
- DOI: 10.1049/el:19770436
- Type: Article
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A detailed experimental and theoretical study has been carried out on the dispersion characteristics of narrow-ridge glass-film optical waveguides formed by ion etching of photoresist. Agreement between experiment and finite-element numerical calculations varies from moderately good to excellent.
Low-loss fibre prepared under high deposition rate by modified c.v.d. technique
- Author(s): K. Yoshida ; Y. Furui ; S. Sentsui ; T. Kuroha
- Source: Electronics Letters, Volume 13, Issue 20, p. 608 –610
- DOI: 10.1049/el:19770437
- Type: Article
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p.
608
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Graded-index fibres with a GeO2-P2O5-SiO2 core have been prepared by a modified c.v.d. and drawing process. The deposition rate of the core glass was 0.17 cm3/min (0.37 g/min), and the fibres have an attenuation of 2.6 dB/km at 0.83 μm and a 6 dB bandwidth of 816 MHz km.
n-way r.f. power splitters
- Author(s): E. Rotholz
- Source: Electronics Letters, Volume 13, Issue 20, page: 610 –610
- DOI: 10.1049/el:19770438
- Type: Article
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A method is described for designing n-way equal power splitters, where n may be any integer.
Bandpass filtering with multibar magnetostatic-surfacewave microstrip transducers
- Author(s): H.J. Wu ; C.V. Smith ; J.H. Collins ; J.M. Owens
- Source: Electronics Letters, Volume 13, Issue 20, p. 610 –611
- DOI: 10.1049/el:19770439
- Type: Article
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–611
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The insertion loss for multibar magnetostatic-surface-wave (m.s.s.w.) transducers has been calculated from a ‘small’-loss microstrip-transmission-line model. Experimental results for 2-bar and 8-bar parallel-strip and 4-bar π transducers are in excellent agreement with theoretical predictions. The 8-bar parallel-strip-transducer delay line gives a major bandpass response at 3.1 GHz, corresponding to an m.s.s.w. wavelength of 300 μm. The insertion loss is 11 dB, the 10 dB bandwidth is 70 MHz and adjacent sidelobes are 16 dB down.
Synthesis of filters with minimum integrated power-loss ratio in the passband
- Author(s): V. Picciarelli and M. Torre
- Source: Electronics Letters, Volume 13, Issue 20, p. 612 –614
- DOI: 10.1049/el:19770440
- Type: Article
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p.
612
–614
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The synthesis of filters with minimum integrated power-loss ratio in the passband is reported. The experimental results obtained with the passband filters realised at microwave frequencies are discussed.
1/f noise of continuous-wave semiconductor lasers
- Author(s): G. Tenchio
- Source: Electronics Letters, Volume 13, Issue 20, p. 614 –616
- DOI: 10.1049/el:19770441
- Type: Article
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p.
614
–616
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Using linearised rate equations, the intensity fluctuations in the output of c.w. d.h. GaAlAs-diode lasers have been calculated in the low-frequency range, where the flicker noise dominates. The theoretical results are compared with the optical-intensity fluctuations, which are obtained experimentally. Our measurements indicate that 1/f noise in lasers is mainly caused by 1/f noise from carrier transport in the bulk material and the contacts.
Hilbert-transformer side-chain phase equaliser for analogue magnetic recording
- Author(s): D. Preis
- Source: Electronics Letters, Volume 13, Issue 20, p. 616 –617
- DOI: 10.1049/el:19770442
- Type: Article
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p.
616
–617
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A substantial amount of phase distortion occurring in analogue magnetic recording can be eliminated by using a simple equalisation scheme which removes the Hilbert-transformed portion of the signal that is added in a normal record/reproduce process. In the phase equaliser, the performance of an ideal Hilbert transformer can be approximated by using a quadrature-phase-shift circuit. The methods of phase equalisation is explained theoretically and oscilloscope photographs of experimental results are presented.
Microwave imaging of subsurface cylindrical scatters from crosspolar backscatter
- Author(s): A.P. Anderson and P.J. Richards
- Source: Electronics Letters, Volume 13, Issue 20, p. 617 –619
- DOI: 10.1049/el:19770443
- Type: Article
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617
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A technique based on polarisation discrimination is shown to produce microwave images of suitably depolarising subsurface targets which are superior to copolar images by virtue of rejecting the rough-surface return.
Analysis of fading due to rain, snow and multipath propagation for 11 GHz radio links variously located in England
- Author(s): D.J.W. Turner and R.L.O. Tattersall
- Source: Electronics Letters, Volume 13, Issue 20, p. 619 –621
- DOI: 10.1049/el:19770444
- Type: Article
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619
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The propagation performance of six microwave links operating at frequencies near 11 GHz were monitored for the years 1973-75. Fades were classified as due to rain, snow or multipath (including other refractive effects). It was found that, on average, the contributions of each of the three types of fade to the total statistics were comparable, although there were considerable variations in the statistics, both from year to year and at different locations.
Initial convergence of recursive maximum-likelihood identification algorithms
- Author(s): J.P. Norton
- Source: Electronics Letters, Volume 13, Issue 20, p. 621 –622
- DOI: 10.1049/el:19770445
- Type: Article
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621
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The effects of modifications proposed by Söderström on the performance of the well known approximate maximum-likelihood identification algorithm based on recursive least squares arc tested on short records. The modified algorithm is found to be susceptible to instability and slow convergence.
Loss in gain and boresight crosspolarisation in reflector antennas with surface errors
- Author(s): S.I. Ghobrial
- Source: Electronics Letters, Volume 13, Issue 20, p. 623 –624
- DOI: 10.1049/el:19770446
- Type: Article
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623
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Isolation and loss in gain measurements on reflector antennas with surface errors are revealed. An expression for the probability density of isolation is given in terms of the r.m.s. error. The cumulative distribution function is also discussed. The loss in gain distribution is discussed and related to crosspolar isolation.
Effect of the reverse bias between channel and substrate on the effective mobility of electrons in a Ge i.g.f.e.t.
- Author(s): Kvon Ze Don ; G. Neizvestny ; V.N. Ovsuyk
- Source: Electronics Letters, Volume 13, Issue 20, p. 624 –626
- DOI: 10.1049/el:19770447
- Type: Article
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An analysis of the behaviour of the electron effective mobility under reverse bias between the channel and substrate in a germanium i.g.f.e.t. is presented. It is shown that the experimentally observed decrease in the effective mobility of the electrons in the channel is mainly caused by the decrease in the electron drift mobility in the channel, rather than by surface-state capture.
Erratum: Intensity modulation of light transmitted in curved optical fibres
- Author(s): R.A. Sammut
- Source: Electronics Letters, Volume 13, Issue 20, page: 626 –626
- DOI: 10.1049/el:19770448
- Type: Article
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