Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 16, Issue 11, 22 May 1980
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 16, Issue 11
22 May 1980
Television demodulator receiving signals by satellite
- Author(s): J.M. Adant and P. Delogne
- Source: Electronics Letters, Volume 16, Issue 11, p. 401 –402
- DOI: 10.1049/el:19800280
- Type: Article
- + Show details - Hide details
-
p.
401
–402
(2)
Reduction of the f.m. threshold is studied for the reception of video signals. A p.l.l. demodulator is designed and tested using the European OTS. Results about the reduction of the threshold are very encouraging.
New n-channel m.o.s.f.e.t.s
- Author(s): Tsutomu Wakimoto and Masakiyo Matsumura
- Source: Electronics Letters, Volume 16, Issue 11, p. 402 –403
- DOI: 10.1049/el:19800281
- Type: Article
- + Show details - Hide details
-
p.
402
–403
(2)
By using plasma c.v.d. and lift-off, an n-channel m.o.s.f.e.t. with effective channel length of 0.4 μm has been fabricated. Its main fabrication processes and obtained electrical characteristics are described.
Index matching fluids for long wavelength (1.2–1.6 μm) fibre-optic applications
- Author(s): C.M. Melliar-Smith ; P.D. Lazay ; G.A. Pasteur ; E.A. Chandross ; D.L. Wood
- Source: Electronics Letters, Volume 16, Issue 11, p. 403 –404
- DOI: 10.1049/el:19800282
- Type: Article
- + Show details - Hide details
-
p.
403
–404
(2)
Halocarbon fluids (FXCCF2)n, where X = Cl or Br have been used to index-match silica in the 800–2000 nm region. These fluids, unlike silicones or hydrocarbon fluids, are free of CH and OH absorption, and are resistant to hydrolysis and moisture absorption.
Disturbance rejection and multivariable self-tuning controllers
- Author(s): T. Hesketh
- Source: Electronics Letters, Volume 16, Issue 11, p. 404 –406
- DOI: 10.1049/el:19800283
- Type: Article
- + Show details - Hide details
-
p.
404
–406
(3)
Disturbance rejection in a self-tuning controller is examined, and a method proposed which allows a class of multivariable systems to be dealt with as a number of single-input/single-output control loops.
OPSEF: an optical sensor for measurement of high electric field intensity
- Author(s): Yuji Hamasaki ; Hideo Gotoh ; Masaaki Katoh ; Seiichi Takeuchi
- Source: Electronics Letters, Volume 16, Issue 11, p. 406 –407
- DOI: 10.1049/el:19800284
- Type: Article
- + Show details - Hide details
-
p.
406
–407
(2)
An optical sensor for measurement of high electric field intensity by means of the electro-optic effect in single-crystal bismuth silicon oxide has been successfully developed and the fundamental characteristics measured. By use of this sensor, the electric field intensities between parallel and coaxial electrodes have been measured.
Optical fibre magnetic field sensors
- Author(s): A. Dandridge ; A.B. Tveten ; G.H. Sigel ; E.J. West ; T.G. Giallorenzi
- Source: Electronics Letters, Volume 16, Issue 11, p. 408 –409
- DOI: 10.1049/el:19800285
- Type: Article
- + Show details - Hide details
-
p.
408
–409
(2)
A class of high sensitivity fibre-optic magnetic sensors has been developed and successfully tested in the laboratory for the first time. The magnetic sensors employ magnetostrictive jacketing materials in conjunction with conventional single-mode optical fibres. An all-fibre Mach-Zender interferometer was used to detect the magnetically induced changes in optical path length which arise because of strains transferred to the fibre from the magnetostrictive jacket.
Clock-steering synthesis using spectral techniques
- Author(s): P.D. Picton
- Source: Electronics Letters, Volume 16, Issue 11, p. 409 –411
- DOI: 10.1049/el:19800286
- Type: Article
- + Show details - Hide details
-
p.
409
–411
(3)
A technique is described which uses the Rademacher-Walsh spectrum to obtain the spectra, and consequently the Boolean form, of the clock-steering functions of bistables. Its usefulness over standard methods is derived from the fact that its simplicity is independent of the number of input variables. Being numerically based, it also is particularly relevant for c.a.d. adoption.
Estimation of fringing capacitance of electrodes on s.i. GaAs substrate
- Author(s): A. Higashisaka and F. Hasegawa
- Source: Electronics Letters, Volume 16, Issue 11, p. 411 –412
- DOI: 10.1049/el:19800287
- Type: Article
- + Show details - Hide details
-
p.
411
–412
(2)
Capacitances of the electrodes with various patterns on a semi-insulating GaAs substrate were measured and analysed to estimate parasitic capacitances of GaAs devices. The fringing capacitance was a larger fraction of the total capacitance for electrodes with area less than 200 μm square. A simple and practical expression for the capacitance was derived from the experimental results.
Bilinear switched-capacitor ladder filter with reduced number of amplifiers
- Author(s): G.C. Temes and M.B. Ghaderi
- Source: Electronics Letters, Volume 16, Issue 11, p. 412 –414
- DOI: 10.1049/el:19800288
- Type: Article
- + Show details - Hide details
-
p.
412
–414
(3)
A novel technique is described for the design of bilinear switched-capacitor ladder filters with a reduced number of amplifiers.
Frequency dependence of Rayleigh backscattering in bidirectional optical systems at 0.83 and 1.3 μm
- Author(s): J. Conradi and I.S. Few
- Source: Electronics Letters, Volume 16, Issue 11, p. 414 –415
- DOI: 10.1049/el:19800289
- Type: Article
- + Show details - Hide details
-
p.
414
–415
(2)
Measurements are presented of the frequency dependence of Rayleigh scattering in a bidirectional optical system at 0.83 and 1.3 μm. The results are compared with a theoretical model. The functional forms of the frequency dependencies at both wavelengths are in good agreement with theory; however, the absolute magnitudes of the Rayleigh back-scattered light levels are lower than predicted.
Growth of Ga0.47In0.53As on InP by low-pressure m.o. c.v.d.
- Author(s): J.P. Hirtz ; J.P. Larivain ; J.P. Duchemin ; T.P. Pearsall ; M. Bonnet
- Source: Electronics Letters, Volume 16, Issue 11, p. 415 –416
- DOI: 10.1049/el:19800290
- Type: Article
- + Show details - Hide details
-
p.
415
–416
(2)
The first heteroepitaxy is reported of Ga0.47In0.53As on InP by low-pressure metalorganic chemical vapour deposition (m.o. c.v.d.). Triethylindium (t.e.i.) and triethylgallium (t.e.g) were used as group III sources, and arsine as the group V source. These Ga0.47In0.53As epilayers exhibit high electron mobility (7.74 cm2 V−1 s−1 for a total impurity concentration of 2.5 × 1016 cm−3 at 300 K) and a photoluminescence efficiency comparable to l.p.e. layers. The lattice mismatch is only Δa0/a0 ≃ 4 × 10−4. Our mobility measurements indicate that m.o. c.v.d. Ga0.47In0.53As is a promising material for microwave device applications.
Effects of capacitance at crossover wirings in power GaAs m.e.s.f.e.t.s.
- Author(s): Y. Aono ; A. Higashisaka ; F. Hasegawa
- Source: Electronics Letters, Volume 16, Issue 11, p. 417 –418
- DOI: 10.1049/el:19800291
- Type: Article
- + Show details - Hide details
-
p.
417
–418
(2)
Power GaAs f.e.t.s. with an air-bridge crossover were compared with those of SiO2 crossover to find the effect of the capacitance at the crossover points. The capacitance of SiO2 crossover points is much smaller than that of the gate pad or the gate busbar in power GaAs f.e.t.s, and deterioration of the microwave performance due to that capacitance is negligible.
High current class AB convertor technique
- Author(s): A. Nedungadi
- Source: Electronics Letters, Volume 16, Issue 11, p. 418 –419
- DOI: 10.1049/el:19800292
- Type: Article
- + Show details - Hide details
-
p.
418
–419
(2)
A high current class AB convertor technique offering both v.c.c.s. and c.c.c.s. capability is described. A simple realisation is proposed which provides peak output currents greater than 100 mA with low distortion and reduced supply drain over a useful frequency range.
Novel method for transmitting images through monomode fibres
- Author(s): J. Piasecki and A. Barthelemy
- Source: Electronics Letters, Volume 16, Issue 11, p. 420 –421
- DOI: 10.1049/el:19800293
- Type: Article
- + Show details - Hide details
-
p.
420
–421
(2)
Using coherent optics techniques, image lines are transformed to the domain of optical frequencies. At the fibre end the image is restored with the help of a grating. Preliminary experimental results are reported.
Effects of fibre propagation loss on diode-laser–fibre coupling
- Author(s): M.L. Dakss and B. Kim
- Source: Electronics Letters, Volume 16, Issue 11, p. 421 –422
- DOI: 10.1049/el:19800294
- Type: Article
- + Show details - Hide details
-
p.
421
–422
(2)
Throughput efficiences and alignment tolerances for coupling lasers to long (≳ 1 km) fibres are strongly dependent on the fibre modal excitation. It is found that, for accurately predicting system performance and for determining packaging tolerance requirements, laser-fibre coupling measurements should be made with long fibres.
Nonblocking 8×8 optical matrix switch for fibre-optic communication
- Author(s): J. Minowa ; Y. Fujii ; Y. Nagata ; T. Aoyama ; K. Doi
- Source: Electronics Letters, Volume 16, Issue 11, p. 422 –423
- DOI: 10.1049/el:19800295
- Type: Article
- + Show details - Hide details
-
p.
422
–423
(2)
A compact nonblocking 8×8 optical switch composed of 64 pentagonal prisms is described. The switch dimensions are 60×120×120 mm. Insertion loss was from 1.7 to 4.0 dB, and switching repeatability was 1 dB.
Integrated bandpass filters
- Author(s): Kamal U. Ahmed
- Source: Electronics Letters, Volume 16, Issue 11, p. 424 –425
- DOI: 10.1049/el:19800296
- Type: Article
- + Show details - Hide details
-
p.
424
–425
(2)
The letter presents some new results associated with one bandpass (b.p.) filter configuration of the integrated uniform R0-C0KR0 structure consisting of two rectangular resistive films, one having per-unit-length (p.u.l.) constant series resistance R0 and the other KR0 (where K is a dimensionless constant), separated from each other by a dielectric film having p.u.l. constant shunt capacitance C0. It is shown that the output voltage in the b.p. region may be made almost constant for the load fluctuations in the wide range R0 ≤ Rt < ∞ (where Rt = load resistance) by selecting K ≤ 0.3. The range of variation of Rt producing constant output voltage in the b.p. region is found to be narrower for increasing value of K.
Stress dependences of longitudinal wave velocity in magnetostrictive metallic-glass ribbon
- Author(s): Ken-Ya Hashimoto ; Masaji Yoshida ; Masatsune Yamaguchi ; Hiroshi Kogo
- Source: Electronics Letters, Volume 16, Issue 11, p. 425 –426
- DOI: 10.1049/el:19800297
- Type: Article
- + Show details - Hide details
-
p.
425
–426
(2)
The letter deals with some effects of an externally applied uniaxial tensile stress on a longitudinal wave velocity in a magnetostrictive metallic-glass ribbon (of which the magnetostriction constant is positive). Experimental results show that a correctly chosen tensile stress gives a doubled velocity change, and reduces the bias field giving maximum velocity change by 22%.
Fusion splicing machine for optical fibres
- Author(s): H. Liertz
- Source: Electronics Letters, Volume 16, Issue 11, p. 426 –427
- DOI: 10.1049/el:19800298
- Type: Article
- + Show details - Hide details
-
p.
426
–427
(2)
A fusion splicing machine has been developed with an integrated fibre cutter and support for the splice case inset with splice magazine. The optical fibres and the electrodes can be manipulated, with the result that the splice losses are minimal and optical fibres with different melting points can be fused. Since the splices are not mechanically strong, tension relief facilities for the splice play an important part.
Differential measurement technique for evaluating microstrip line attenuation
- Author(s): L. Accatino and A. Angelucci
- Source: Electronics Letters, Volume 16, Issue 11, p. 427 –429
- DOI: 10.1049/el:19800299
- Type: Article
- + Show details - Hide details
-
p.
427
–429
(3)
A differential measurement technique employing straight line end coupled microstrip resonators is presented. The technique allows separate measurement of microstrip attenuation constant and end loss contributions, and works well up to Ku-band and above.
Calculation of impulse response of multimode optical fibre
- Author(s): P.L. Chu
- Source: Electronics Letters, Volume 16, Issue 11, p. 429 –431
- DOI: 10.1049/el:19800300
- Type: Article
- + Show details - Hide details
-
p.
429
–431
(3)
A simple and fast method of calculating the impulse response of a multimode optical fibre of arbitrary index profile is presented. In many cases, this method leads to simple analytical expressions which provide fuller understanding on the formation of impulse response.
Synthesis of nonlinear functions using continued fraction expansion
- Author(s): A. Cichocki
- Source: Electronics Letters, Volume 16, Issue 11, p. 431 –433
- DOI: 10.1049/el:19800301
- Type: Article
- + Show details - Hide details
-
p.
431
–433
(3)
A realisation of a nonlinear function which can be represented by terminated or truncated continued fraction are given. Two new alternative structures for realisation of nonlinear voltage transfer functions are proposed. The circuits use analogue summers with controlled gains or i.c. multipliers and o.a. summers.
Activation of low dose silicon implants in GaAs by multiply scanned electron beams
- Author(s): N.J. Shah ; H. Ahmed ; I.R. Sanders ; J.F. Singleton
- Source: Electronics Letters, Volume 16, Issue 11, p. 433 –434
- DOI: 10.1049/el:19800302
- Type: Article
- + Show details - Hide details
-
p.
433
–434
(2)
Low dose implants of Si+ into semi-insulating GaAs have been annealed with the multiply scanned electron beam processing system. The activation of ions was about 55%, with a high peak concentration and a carrier mobility of 3800 cm2/Vs. The samples were unencapsulated and showed no surface degradation after annealing.
Hardware-efficient bit sequential adders and multipliers using mode-controlled logic
- Author(s): D.C. Daws and E.V. Jones
- Source: Electronics Letters, Volume 16, Issue 11, p. 434 –436
- DOI: 10.1049/el:19800303
- Type: Article
- + Show details - Hide details
-
p.
434
–436
(3)
A logic gate with facilities for changing the mode of operation on application of a control signal is presented as a versatile circuit element. Addition is shown to be an example where the incoming data can be used to derive the necessary control signals to operate such a gate. Mode-controlled gates are then used to achieve serial multiplication, again using data derived control signals. Designs are seen to be fast and hardware efficient.
Improved minimax algorithm for circuit optimisation
- Author(s): C.M. Vidallon
- Source: Electronics Letters, Volume 16, Issue 11, p. 436 –437
- DOI: 10.1049/el:19800304
- Type: Article
- + Show details - Hide details
-
p.
436
–437
(2)
An algorithm is proposed to solve minimax problems, based on the processing of a locally linearised subproblem, with a strictly steepest descent procedure.
Near-infra-red absorption using InGaAsP sources
- Author(s): H. Temkin and A.K. Chin
- Source: Electronics Letters, Volume 16, Issue 11, p. 437 –439
- DOI: 10.1049/el:19800305
- Type: Article
- + Show details - Hide details
-
p.
437
–439
(3)
The potential of InGaAsP light-emitting diodes (l.e.d.s) as light sources for quantitative absorption measurements in the 0.9–1.6 μm region is discussed. Since a variety of chemicals, including atmospheric water vapour and pollutants such as CO2 and NO2 have absorption bands in the spectral region spanned by InGaAsP l.e.d.s, this technique is useful in evaluating impurity content. Detection of the atmospheric water vapour band centred at 1.38 μm is demonstrated. The application of this technique for assessing the OH content of optical fibres is also discussed.
Time scale independent signal transmission
- Author(s): L. Faltin
- Source: Electronics Letters, Volume 16, Issue 11, p. 439 –440
- DOI: 10.1049/el:19800306
- Type: Article
- + Show details - Hide details
-
p.
439
–440
(2)
Transforming the time scale from linear to exponential prior to transmission, and back to linear after reception, permits a conversion of time scale distortions in the transmission path into time base jitter, which is more easily removed.
Waisted-rib optical waveguides in GaAs
- Author(s): D.N. MacFadyen ; C.R. Stanley ; C.D.W. Wilkinson
- Source: Electronics Letters, Volume 16, Issue 11, p. 440 –441
- DOI: 10.1049/el:19800307
- Type: Article
- + Show details - Hide details
-
p.
440
–441
(2)
A novel single index waveguiding structure is described with possible applications in the field of integrated optics. By exploiting the preferential etch characteristics of GaAs, waisted-rib structures have been fabricated on the surface of bulk material which are capable of supporting bound modes.
Role of water in gradual degradation of (Al,Ga)As d.h. lasers
- Author(s): J.A.F. Peek
- Source: Electronics Letters, Volume 16, Issue 11, p. 441 –442
- DOI: 10.1049/el:19800308
- Type: Article
- + Show details - Hide details
-
p.
441
–442
(2)
The presence of water vapour in the ambient of (Al,Ga)As d.h. lasers is found to be a main cause of facet erosion and gradual output degradation. Facet erosion and gradual degradation are absent in lasers operated in a vacuum of 2×10−8 torr at c.w. output powers of up to 4 mW per μm stripe width.
New analytical model for rectangular image guide
- Author(s): Ph. Gelin ; S. Toutain ; J.F. Legier
- Source: Electronics Letters, Volume 16, Issue 11, p. 442 –444
- DOI: 10.1049/el:19800309
- Type: Article
- + Show details - Hide details
-
p.
442
–444
(3)
The letter tries to define a model which allows one to describe not only the guided waves in a rectangular image guide but also the possibilities of coupling between these latter and the continuous mode spectrum (radiation losses). A first approach is presented, and to confirm the validity of the model the theoretical results are compared to field variation measurements.
Erratum: Monolithic v.c.c.s. for high-frequency RC active filters
- Author(s): J.W. Haslett ; M.K.N. Rao ; L.T. Bruton
- Source: Electronics Letters, Volume 16, Issue 11, page: 444 –444
- DOI: 10.1049/el:19800310
- Type: Article
- + Show details - Hide details
-
p.
444
(1)
Erratum: Cascade synthesis of switched-capacitor networks employing voltage inverter switches
- Author(s): M.K. Li
- Source: Electronics Letters, Volume 16, Issue 11, page: 444 –444
- DOI: 10.1049/el:19800311
- Type: Article
- + Show details - Hide details
-
p.
444
(1)
Erratum: New commutated Doppler microwave landing system
- Author(s): F.R. Connor
- Source: Electronics Letters, Volume 16, Issue 11, page: 444 –444
- DOI: 10.1049/el:19800312
- Type: Article
- + Show details - Hide details
-
p.
444
(1)
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article
