Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 12, Issue 2, 22 January 1976
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Volume 12, Issue 2
22 January 1976
Transistor transit-time oscillator (translator)
- Author(s): G.T. Wright
- Source: Electronics Letters, Volume 12, Issue 2, p. 37 –38
- DOI: 10.1049/el:19760029
- Type: Article
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Operation of a novel junction-transistor structure as a microwave negative-resistance diode is described. Negative-resistances of −25 Ω at 10 GHz are predicted, corresponding to negative Q-factors of −5. Large-signal c.w. power outputs of the order of 1 W from individual devices are indicated. It is expected that device operation in the frequency range 1–100 GHz should be possible at voltage bias levels from 5 to 50 V.
Calculating poles and zeros of matrix transfer functions
- Author(s): V. Sinswat and F. Fallside
- Source: Electronics Letters, Volume 12, Issue 2, p. 38 –39
- DOI: 10.1049/el:19760030
- Type: Article
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The letter is concerned with a computational procedure for determining the poles and zeros of a matrix whose elements are in the field of rational functions.
Frequency-hopped-waveform synthesis with a surface-acoustic-wave tapped delay line
- Author(s): G. Manes and P. Grant
- Source: Electronics Letters, Volume 12, Issue 2, p. 39 –41
- DOI: 10.1049/el:19760031
- Type: Article
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A coherent frequency-hopped-waveform synthesiser, based on the detection of contradirected chirp signals within a surface-acoustic-wave tapped delay line, is reported. Attractive features are programmable bandwidth and hop duration through control of external chirps, plus the capability to synthesise many simultaneous coherent outputs.
Reply to ‘Comment on New multiple feedback active RC network’
- Author(s): D.J. Perry
- Source: Electronics Letters, Volume 12, Issue 2, page: 41 –41
- DOI: 10.1049/el:19760032
- Type: Article
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Generation-recombination noise in the channel of GaAs Schottky-gate field-effect transistors
- Author(s): D. Sodini ; A. Touboul ; G. Lecoy ; M. Savelli
- Source: Electronics Letters, Volume 12, Issue 2, p. 42 –43
- DOI: 10.1049/el:19760033
- Type: Article
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The low-frequency noise in GaAs m.e.s. f.e.t.s was measured continuously for temperatures varying from 80 to 310K. It presented distinct maxima, suggesting the presence of several g.r. processes. The shift of these peaks at different frequencies (500 Hz to 1 MHz) allowed us to obtain the time constants and the activation energies of four trapping levels. The noise reported here could stem from multilevel trapping in the channel.
Asynchronous polling arbiter
- Author(s): A.S. Cowan
- Source: Electronics Letters, Volume 12, Issue 2, p. 43 –44
- DOI: 10.1049/el:19760034
- Type: Article
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Details of a simple polling arbiter used to control the access of a common resource by n independently clocked digital systems (processors) are given. The design, which minimises the number of asynchronous circuits needed, requires only n+2 interconnection lines.
Parametric transducer for high-speed real-time acoustic imaging
- Author(s): C. Sabet and C.W. Turner
- Source: Electronics Letters, Volume 12, Issue 2, p. 44 –45
- DOI: 10.1049/el:19760035
- Type: Article
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The letter reports the development of a novel high-speed scanning acoustic imaging system, potentially suitable for medical diagnosis, nondestructive testing and acoustic microscopy. The key element of this system is a parametric transducer, consisting of a photoconductor-piezoelectric sandwich in which the nonlinear behaviour is the basis of an optical-readout method. Preliminary measurements at 2.7 MHz have indicated that the sensitivity is better than 0.2 μW/cm2, and a resolution approaching the expected limiting value of 0.7 mm has been achieved.
Four noise parameters of 2-ports with complex topology
- Author(s): P. Stangerup
- Source: Electronics Letters, Volume 12, Issue 2, p. 45 –46
- DOI: 10.1049/el:19760036
- Type: Article
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A method for computing the four noise parameters of a 2-port with arbitrary topology is described. The tool used is the adjoint network concept in connection with a computer program for electrical-network analysis. It is shown that only a small additional effort is needed to obtain a complete description of the noise behaviour for any source admittance.
Quantisation-noise analysis of digital filters with controlled quantisation
- Author(s): T.A.C.M. Claasen
- Source: Electronics Letters, Volume 12, Issue 2, p. 46 –48
- DOI: 10.1049/el:19760037
- Type: Article
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Two models for quantisation noise in digital filters with controlled quantisation are derived. These models are generalisations of models that have been proposed previously for magnitude truncation quantisation. The use of the models is demonstrated by an example.
Efficient implementation of multiple-beam sampler for continuously scanned array antennas
- Author(s): S. Haykin
- Source: Electronics Letters, Volume 12, Issue 2, page: 48 –48
- DOI: 10.1049/el:19760038
- Type: Article
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A multiple-beam sampler is described for continuously scanned array antennas using time modulation or frequency modulation. It is shown that, for the special case of an array antenna with a number of elements equal to an integer power of two, the multiple-beam sampler can be implemented using a minimum number of phase shifters and adders.
Comment on ‘1/f noise in resistors’
- Author(s): O. Mueller
- Source: Electronics Letters, Volume 12, Issue 2, p. 48 –49
- DOI: 10.1049/el:19760039
- Type: Article
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Matrix method for systematising sequential-circuit design
- Author(s): E.W. Page
- Source: Electronics Letters, Volume 12, Issue 2, p. 49 –50
- DOI: 10.1049/el:19760040
- Type: Article
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A matrix method for systematising sequential-machine realisation is described. This method has the advantage of allowing the designer to proceed, in an algorithmic fashion, directly from a machine's state table to the required excitation function, without explicit derivation of transition tables or excitation maps.
Wide-bandwidth high-radiance gallium-arsenide light-emitting diodes for fibre-optic communication
- Author(s): R.C. Goodfellow and A.W. Mabbitt
- Source: Electronics Letters, Volume 12, Issue 2, p. 50 –51
- DOI: 10.1049/el:19760041
- Type: Article
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High-radiance GaAs l.e.d.s with 3 dB modulation bandwidths exceeding 500 MHz have been fabricated from p-n junction layers prepared with very high zinc acceptor doping levels. This development will permit the use of l.e.d.s in near-gigahertz or gigabit/s optical-fibre communication links.
Effect of heat treatment on the nature of traps in epitaxial GaAs
- Author(s): F. Hasegawa and A. Majerfeld
- Source: Electronics Letters, Volume 12, Issue 2, p. 52 –53
- DOI: 10.1049/el:19760042
- Type: Article
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By annealing v.p.e. GaAs at increasing temperatures, the commonly observed 0.83 eV electron trap in v.p.e. and bulk GaAs is removed and a 0.64 eV hole trap, also detected in l.p.e. GaAs, is introduced. The results indicate that these electron and hole traps are related to Ga and As vacancies, respectively.
First anodic-oxide GaAs m.o.s.f.e.t.s based on easy technological processes
- Author(s): B. Bayraktaroglu ; E. Kohn ; H.L. Hartnagel
- Source: Electronics Letters, Volume 12, Issue 2, p. 53 –54
- DOI: 10.1049/el:19760043
- Type: Article
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It is shown that a new technology results in the first native-oxide m.o.s.f.e.t.s. Their electrical behaviour is described.
X-band performance of GaAs power f.e.t.s
- Author(s): H.M. Macksey ; R.L. Adams ; D.N. McQuiddy ; W.R. Wisseman
- Source: Electronics Letters, Volume 12, Issue 2, p. 54 –56
- DOI: 10.1049/el:19760044
- Type: Article
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The results of X-band measurements on GaAs power f.e.t.s are reported. These devices are fabricated with a simple planar process. Devices with output powers of 1 W or more at 9 GHz with 4 dB gain have been fabricated from more than a dozen slices. The highest output powers observed with 4 dB gain are 1.78 W at 9 GHz and 2.5 W at 8 GHz. Devices have been operated with 46% power-added efficiency at 8 GHz.
Delay-line-stabilised microwave oscillator
- Author(s): C.S. Aitchison and E.R. Batliwala
- Source: Electronics Letters, Volume 12, Issue 2, p. 56 –57
- DOI: 10.1049/el:19760045
- Type: Article
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The technique of oscillator stabilisation by a delay line, previously used at h.f., is extended to microwave frequencies. Performance details are given at X-band, showing a stabilisation ratio of about 23 and an improvement in f.m. oscillator stability. The system remains in lock throughout X-band.
P.C.M. A-law decoder using a circulating method
- Author(s): P. Bylanski
- Source: Electronics Letters, Volume 12, Issue 2, p. 57 –58
- DOI: 10.1049/el:19760046
- Type: Article
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This letter describes an algorithm for p.c.m. A-law decoding and a simple realisation based on the use of a circulating method. Results of initial measurements fall within the required p.c.m. specifications for speech.
Adaption of directly measurable transistor noise parameters to computer-aided noise analysis
- Author(s): P. Stangerup
- Source: Electronics Letters, Volume 12, Issue 2, p. 58 –59
- DOI: 10.1049/el:19760047
- Type: Article
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A transistor is conveniently characterised by four real noise parameters available from outer-terminal measurements. This representation is easily implemented into a computer program for noise analysis. The Rothe-Dahlke noise circuit is used in connection with the adjoint-network concept, and no additional auxiliary nodes are required.
Monte Carlo simulation of current transport in forward-biased Schottky-barrier diodes
- Author(s): G. Baccarani and A.M. Mazzone
- Source: Electronics Letters, Volume 12, Issue 2, p. 59 –60
- DOI: 10.1049/el:19760048
- Type: Article
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The transport of carriers across the semiconductor space-charge region of a forward-biased Schottky-barrier diode is investigated by a Monte Carlo simulation of the transport process. The electron distribution function at the m.s. boundary turns out to be hemi-Maxwellian, but the electron concentration is about one-half of that predicted by the t.d. theory.
Erratum: Quick accurate design of a frequency-stabilised coaxial dielectric resonator
- Author(s): P. Guillon ; P. Choteau ; J. Citerne ; L. Raczy
- Source: Electronics Letters, Volume 12, Issue 2, page: 60 –60
- DOI: 10.1049/el:19760049
- Type: Article
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