Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 17, Issue 22, 29 October 1981
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Volume 17, Issue 22
29 October 1981
Harmonic operation of GaAs millimetre wave transferred electron oscillators
- Author(s): W.H. Haydl
- Source: Electronics Letters, Volume 17, Issue 22, p. 825 –826
- DOI: 10.1049/el:19810574
- Type: Article
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Harmonic operation of GaAs millimetre wave transferred electron (TE) oscillators has been identified using a wideband waveguide system. The harmonic number was determined by precisely measuring the frequency as well as the frequency variations of the harmonic components when the oscillator was tuned mechanically or electrically. We find that GaAs TE oscillators at 94 GHz, matched to a waveguide circuit by means of a resonant disc, operate at the second or third harmonic frequency, depending on the length of the active GaAs region, which was between 1.8 and 2.6 μm.
1.3 μm InP/InGaAsP planar avalanche photodiodes
- Author(s): T. Shirai ; F. Osaka ; S. Yamasaki ; K. Nakajima ; T. Kaneda
- Source: Electronics Letters, Volume 17, Issue 22, p. 826 –827
- DOI: 10.1049/el:19810575
- Type: Article
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An InP/InGaAsP planar avalanche photodiode operating at a wavelength of 1.3 μm has been fabricated by using Be implantation and a difference of impurity concentrations between two n-InP epitaxial layers. A sufficient guard ring effect is demonstrated by a photoresponse, and an avalanche gain of 110 is obtained at an initial photocurrent of 0.35 μA.
High frequency ZnO-SiO2-Si surface acoustic wave convolvers
- Author(s): M.R. Melloch ; R.L. Gunshor ; R.F. Pierret
- Source: Electronics Letters, Volume 17, Issue 22, p. 827 –828
- DOI: 10.1049/el:19810576
- Type: Article
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The separate comb grating transducer configuration is used in the fabrication of high frequency convolvers in the metal-ZnO-SiO2-Si surface acoustic wave device structure. A Rayleigh convolver with an operating frequency of 285 MHz and a Sezawa convolver with an operating frequency of 355 MHz are reported.
Low-loss multifibre connectors with plug-guide-grooved silicon
- Author(s): T. Satake ; S. Nagasawa ; H. Murata
- Source: Electronics Letters, Volume 17, Issue 22, p. 828 –830
- DOI: 10.1049/el:19810577
- Type: Article
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Low-loss interchangable multifibre connectors have been developed using plugs consisting of large guiding grooved and fibre-fixing V-grooved silicon chips. Guiding grooves etched on silicon chips accomplish extremely small average fibre offset less than 2 μm. A 6-fibre connector plug pair selected from the same wafer exhibits 0.14 dB average connection loss. Connector plugs from different wafers exhibit 0.17 dB and 0.24 dB average connection losses.
Inverse Jury-Blanchard table and its applications to the inverse stability problem
- Author(s): A.C. Tsoi
- Source: Electronics Letters, Volume 17, Issue 22, p. 830 –831
- DOI: 10.1049/el:19810578
- Type: Article
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This letter shows that the coefficients of the characteristic equation of a discrete time system can be obtained in a simple manner if the elements of the first column of the Jury-Blanchard table are given.
Coupling of an optical fibre to a substrate entry photodiode
- Author(s): B.M. MacDonald and A.G. Saunders
- Source: Electronics Letters, Volume 17, Issue 22, p. 832 –833
- DOI: 10.1049/el:19810579
- Type: Article
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The construction of a quartz block containing an optical fibre for mounting a substrate illuminated InGaAs/InP photodiode is described. The block allows accurate alignment of the fibre to the photodiode, which can then be fully characterised before assembly into a circuit.
Least-squares magnitude filters with self-equalised delay characteristic
- Author(s): D.D. Rakovich and M.Dj. Radmanovich
- Source: Electronics Letters, Volume 17, Issue 22, p. 833 –834
- DOI: 10.1049/el:19810580
- Type: Article
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A new class of nonminimum-phase transfer functions with one pair of real-axis transmission zeros is described. These functions are suitable for determining the lowpass prototype networks in the design of narrow bandpass filters at microwave frequencies with small passband loss and very flat delay response over the central part of the passband.
Self-aligned normally off GaAs MESFET using Sn-doped SiO2 glass
- Author(s): Y. Ishii and Y. Kawasaki
- Source: Electronics Letters, Volume 17, Issue 22, p. 834 –836
- DOI: 10.1049/el:19810581
- Type: Article
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An improved normally-off GaAs MESFET was fabricated by employing Sn-doped SiO2 glass, which was used as an Sn-diffusant for making the N+ layer. An N+ layer with Rs=100$/□ and Ns=3×1013 cm−2 was successfully obtained under 800°C, 20 min diffusion conditions. A new self-alignment technique, using doped-SiO2 film, provided a high performance normally-off GaAs FET.
Efficient three-wavelength-output SAW multistrip beam compressor for convolver applications
- Author(s): S. Ameri and D.J. Gunton
- Source: Electronics Letters, Volume 17, Issue 22, p. 836 –838
- DOI: 10.1049/el:19810582
- Type: Article
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The problem of obtaining very narrow surface acoustic wave beams from multistrip compressors is examined experimentally, and a modified geometry is described which allows an extension of previous design methods to narrower output beam compressors, such as required, for example, for direct feeding of a 3λ-wide acoustic waveguide in a monolithic convolver.
Temperature dependence of peak heights in deep-level transient spectroscopy
- Author(s): P.I. Rockett and A.R. Peaker
- Source: Electronics Letters, Volume 17, Issue 22, p. 838 –839
- DOI: 10.1049/el:19810583
- Type: Article
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With the aid of a high precision computer simulation we demonstrate that the frequently observed variation in DLTS peak height with emission rate window is not necessarily caused by nonexponential capacitance transients as is often supposed, but rather by the change in shape of the Debye tail with temperature. This variation in peak height is shown to be a function of temperature, reverse bias and trap depth.
Undoped semi-insulating LEC GaAs: a model and a mechanism
- Author(s): J.R. Oliver ; R.D. Fairman ; R.T. Chen ; P.W. Yu
- Source: Electronics Letters, Volume 17, Issue 22, p. 839 –841
- DOI: 10.1049/el:19810584
- Type: Article
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–841
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Undoped semi-insulating GaAs grown by the high-pressure liquid encapsulated Czochralski (LEC) method has been produced for use in direct ion implantation in several laboratories.1–4 A clear understanding of the factors controlling impurity transport and compensation in these materials has been lacking to date. In this work, detailed characterisation has been performed on undoped semi-insulating crystals grown from both SiO2 and PBN crucibles followed by a proposed impurity model and compensation mechanism.
Pseudostereoscopic holographic imaging system: a possible approach to high resolution underwater mapping
- Author(s): D.I. Shaw ; A.P. Anderson ; J.C. Bennett
- Source: Electronics Letters, Volume 17, Issue 22, p. 841 –842
- DOI: 10.1049/el:19810585
- Type: Article
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The performance of a sideways looking CW synthetic aperture imaging system composed of two separated colinear arrays is examined. It is demonstrated through a simulation that the configuration can provide high resolution in both along-and across-track directions. Inherent distortion is removed from the image distribution by the application of a suitable correction algorithm.
Thermo-optic effect in LiNbO3, for light deflection and switching
- Author(s): M. Haruna and J. Koyama
- Source: Electronics Letters, Volume 17, Issue 22, p. 842 –844
- DOI: 10.1049/el:19810586
- Type: Article
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Light deflection and switching in LiNbO3 via thermo-optic effect based on the temperature dependence of the refractive index are demonstrated. The switching speed of 1 ms order has been confirmed in the thermo-optically induced waveguide switch.
Tradeoffs between noise, distortion and fibre length for multichannel analogue TV transmission over graded index fibres at 0.83 μm
- Author(s): H.P. Berger ; R. Welter ; A. Dill ; G. Guekos ; H. Melchior
- Source: Electronics Letters, Volume 17, Issue 22, p. 844 –845
- DOI: 10.1049/el:19810587
- Type: Article
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The tradeoffs between noise, distortion and fibre length allowing multichannel TV transmission by analogue modulation over kilometer lengths have been investigated experimentally. Two and four VHF TV channels have been transmitted using linearly driven diode lasers at 0.83 μm and multimode fibres over four and one kilometer, respectively, with signal/noise ratios above 40 dB (video unweighted) and intermodulation distortions below −65 dB.
Sidewall effects in shallow emitter of small bipolar transistor
- Author(s): A.A. Eltoukhy and D.J. Roulston
- Source: Electronics Letters, Volume 17, Issue 22, p. 845 –846
- DOI: 10.1049/el:19810588
- Type: Article
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The current injected into a shallow emitter is studied using a two-dimensional numerical solution of the transport equations, including the effects of bandgap reduction, lifetime and surface recombination velocity. The present results show clearly the correlation between the injected current and the bowl-shaped emitter area as well as the width of metal contact.
Double crucible optical fibre for data link applications
- Author(s): A.A. Beales ; P.W. France ; S. Partington
- Source: Electronics Letters, Volume 17, Issue 22, p. 846 –848
- DOI: 10.1049/el:19810589
- Type: Article
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A short distance, data link fibre has been made by the double crucible method. The fibre has a large core (175 μm), high NA (0.4) and a minimum loss of 7.5 dB/km. By lowering the water content of the fibre the usable wavelength range has been extended to 1.3 μm
Conditions for operation of semiconductor laser with negative light/current characteristic
- Author(s): S.J. Chua
- Source: Electronics Letters, Volume 17, Issue 22, p. 848 –849
- DOI: 10.1049/el:19810590
- Type: Article
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A semiconductor laser with a controlled amount of saturable absorber states can be made to produce a negative light/current characteristic. The conditions required to achieve such a characteristic are given in the letter. Such a device can be switched on by an external light pulse when appropriately biased.
Optical FM signal amplification and FM noise reduction in an injection locked AlGaAs semiconductor laser
- Author(s): S. Kobayashi ; Y. Yamamoto ; T. Kimura
- Source: Electronics Letters, Volume 17, Issue 22, p. 849 –851
- DOI: 10.1049/el:19810591
- Type: Article
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–851
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Optical frequency. modulation index suppression in FM signal amplification and FM signal generation in an injection locked semiconductor laser are experimentally studied by injecting coherent FM signals and CW light, respectively. Experimental results are in good agreement with a simple theory using the van der Pol equation with an external signal term. The FM noise accumulation in cascade injection locked amplifiers is calculated and an optimum design for an injection locked repeater system is discussed.
Effect of direct current on spuriously generated third harmonics
- Author(s): H.S. Ahluwalia and E.J.P. May
- Source: Electronics Letters, Volume 17, Issue 22, p. 851 –852
- DOI: 10.1049/el:19810592
- Type: Article
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An investigation is made into the effect of direct current on the third harmonic voltage produced by a very pure sinusoidal current passing through commercially available resistors. It is found that the third harmonic voltage falls in amplitude as the direct current is increased.
SSB versus FM at VHF for mobile radio telephony
- Author(s): A.J. Motley
- Source: Electronics Letters, Volume 17, Issue 22, p. 852 –854
- DOI: 10.1049/el:19810593
- Type: Article
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Results from a comparison of SSB and FM for telephony use in mobile radio are reported. The tests were conducted at carrier frequencies of about 160 MHz, and the impairments considered included ignition noise, fading and cochannel interference. The results show the subjective performance of SSB to be poorer than that of 12.5 kHz FM.
2-D digital filters using logarithmic number systems
- Author(s): G.L. Sicuranza
- Source: Electronics Letters, Volume 17, Issue 22, p. 854 –855
- DOI: 10.1049/el:19810594
- Type: Article
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The letter deals with the design of 2-D digital filters to be implemented in a logarithmic number system. The accuracy of the coefficient representation is considered, and a limit on the maximum useful word length is derived. An optimisation procedure is proposed, together with a few examples of 2-D filter design.
Finite-element analysis of topographic waveguides for acoustic surface waves using approximate analytical solutions
- Author(s): M. Koshiba ; M. Okada ; M. Suzuki
- Source: Electronics Letters, Volume 17, Issue 22, p. 856 –857
- DOI: 10.1049/el:19810595
- Type: Article
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An efficient finite-element program utilising approximate analytical solutions is described for the analysis of topographic waveguides for acoustic surface waves. The results obtained agree well with the earlier theoretical and experimental results.
Wavelength division multiplexing experiment employing dual-wavelength LEDs and photodetectors
- Author(s): K. Ogawa ; T.P. Lee ; C.A. Burrus ; J.C. Campbell ; A.G. Dentai
- Source: Electronics Letters, Volume 17, Issue 22, p. 857 –858
- DOI: 10.1049/el:19810596
- Type: Article
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857
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The performance of a wavelength-division-multiplexed light-wave system employing dual-wavelength InGaAsP LEDs and photodiodes near 1 μm and 1.3 μm wavelengths is reported. The dual-wavelength receiver, operated at 33 Mbit/s, provided −38.5 dBm and −39.7 dBm sensitivities at 10−9 BER in the two wavelength bands, respectively.
Subjective performance of amplitude companding in SSB mobile radio systems
- Author(s): J.P. McGeehan and A. Bateman
- Source: Electronics Letters, Volume 17, Issue 22, p. 859 –860
- DOI: 10.1049/el:19810597
- Type: Article
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In the letter the subjective performance of a VHF single sideband mobile radio system is compared with and without amplitude companding. Laboratory and field tests show that the use of amplitude companding significantly improves the subjective performance, particularly at low signal strengths.
Depth of field improvements in long wavelength imaging systems
- Author(s): J.C. Bennett and A. Yamani
- Source: Electronics Letters, Volume 17, Issue 22, p. 860 –862
- DOI: 10.1049/el:19810598
- Type: Article
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An alternative approach to the problem of depth of field limitations in long wavelength imaging systems is proposed. A simulation is presented to demonstrate the capabilities of the method and its feasibility is demonstrated at a free-space ultrasonic frequency of 40 kHz.
Erratum: Compound representation of high resolution sea clutter
- Author(s): K.D. Ward
- Source: Electronics Letters, Volume 17, Issue 22, page: 862 –862
- DOI: 10.1049/el:19810599
- Type: Article
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Erratum: Effect of illumination and gate bias on flat-band voltage in plasma CVD Si-N on n-Si MIS structure
- Author(s): M.U. Jeong ; J. Shirafuji ; Y. Inuishi ; H. Yakushiji ; K. Harada ; H. Oka
- Source: Electronics Letters, Volume 17, Issue 22, page: 862 –862
- DOI: 10.1049/el:19810600
- Type: Article
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Erratum: Conditions for synchronisation and corresponding user capacities for spread-spectrum multiple-access systems
- Author(s): M. Beale
- Source: Electronics Letters, Volume 17, Issue 22, page: 862 –862
- DOI: 10.1049/el:19810601
- Type: Article
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Erratum: Distributed mailbox arrangement which facilitates task communication in a multimicroprocessor system
- Author(s): N. Jayaram and P.L. Evans
- Source: Electronics Letters, Volume 17, Issue 22, page: 862 –862
- DOI: 10.1049/el:19810602
- Type: Article
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