Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 13, Issue 4, 17 February 1977
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Volume 13, Issue 4
17 February 1977
Correlation of pulsed m.o.s. capacitor measurements with oxidation induced defects
- Author(s): T.F. Unter ; P.C.T. Roberts ; D.R. Lamb
- Source: Electronics Letters, Volume 13, Issue 4, p. 93 –94
- DOI: 10.1049/el:19770065
- Type: Article
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Large variations have been observed between pulsed capacitor relaxation-time measurements made on samples which have received identical processing. This effect has been studied with 1 mm-diameter m.o.s. capacitors on (100)-orientation Czochralski silicon wafers. The measured relaxation times are related to process-induced defects, particularly oxidation-induced stacking faults.
Static-hazard detection in switching circuits by prime-implicant examination in fuzzy functions
- Author(s): A. Thayse
- Source: Electronics Letters, Volume 13, Issue 4, p. 94 –96
- DOI: 10.1049/el:19770066
- Type: Article
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A theorem is stated which allows the detection of static hazards in switching circuits by simple examination of the prime implicants and of the prime implicates of a fuzzy function associated with the switching circuit.
Maximum information capacity of fibre-optic waveguides
- Author(s): F.P. Kapron
- Source: Electronics Letters, Volume 13, Issue 4, p. 96 –97
- DOI: 10.1049/el:19770067
- Type: Article
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For the region of ‘zero material dispersion’, it is shown that a 2nd-order effect proportional to the square of the source spectral width determines the lower limit to fibre pulse spreading. The optimum operating wavelength depends on the V-value of the guide.
High-Q-factor s.a.w. resonators at 780 MHz
- Author(s): K.R. Laker ; T.L. Szabo ; W.J. Kearns
- Source: Electronics Letters, Volume 13, Issue 4, p. 97 –99
- DOI: 10.1049/el:19770068
- Type: Article
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The design and fabrication of upper-v.h.f.-frequency s.a.w. resonators are described. Experimental results are presented for s.a.w. resonators on ST quartz having a Q-factor of nearly 5000 at 780 MHz.
High-speed current-mode threshold gate with clamps and current comparison
- Author(s): R. Launée
- Source: Electronics Letters, Volume 13, Issue 4, p. 99 –100
- DOI: 10.1049/el:19770069
- Type: Article
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A circuit for a haigh-speed threshold gate with low power dissipation is given. Compared with known circuits, it has many advantages, e.g. minimal power-supply voltage is not dependent on logic parameters of the threshold gate such as the number of inputs and their wieghts. Propagation delay time remains low compared with these circuits, as is shown by simulation using a simple model and by measurements on a physical gate.
Negative resistance and c.w. oscillation of the transit-time transistor
- Author(s): M. Armand ; G. Salmer ; Y. Crosnier ; Y. Druelle
- Source: Electronics Letters, Volume 13, Issue 4, p. 100 –102
- DOI: 10.1049/el:19770070
- Type: Article
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Negative resistance and c.w. microwave oscillation (5.4 mW at 5.7 GHz) have been observed with the transistor transit-time oscillator. The agreement of these observation with theoretical calculations and the possible advantages of this new component are discussed.
Broadening of primary feed patterns by small E-plane slots
- Author(s): L. Shafai
- Source: Electronics Letters, Volume 13, Issue 4, p. 102 –103
- DOI: 10.1049/el:19770071
- Type: Article
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It is shown that the radiation patterns of a circular waveguide with a corrugated flange can be broadened by using small E-plane slots. These slots tend to improve the amplitude patterns of the feed, but introduce some phase variations in the axial radiation.
Effect of vibration on s.a.w.-oscillator noise spectra
- Author(s): R.D. Weglein and O.W. Otto
- Source: Electronics Letters, Volume 13, Issue 4, p. 103 –104
- DOI: 10.1049/el:19770072
- Type: Article
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The detailed phase noise power spectrum of a 97 MHz s.a.w. periodic-grating oscillator (p.g.o.) driving a 96-times multiplier has been measured in the vicinity (0–20 kHz) of the 9.3 GHz carrier. The noise spectra of the p.g.o. were measured under quiescent and random vibrational conditions. The experimental s.a.w. oscillator is shown to be completely immune to vibration, whereas a well developed crystal v.c.x.o. at the same frequency shows a dramatic increase in noise when subjected to vibration.
Integral-equation approach to the abrupt-depletion approximation in semiconductor components
- Author(s): P. de Visschere and G. de Mey
- Source: Electronics Letters, Volume 13, Issue 4, p. 104 –106
- DOI: 10.1049/el:19770073
- Type: Article
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By using the abrupt-depletion approximation, one obtains a linear equation for the minority-carrier concentration in a semiconductor. This equation describes the diffusion and the recombination statistics of the carriers under steady-state conditions. In a 2-dimensional geometry, this equation can be replaced by an equivalent integral equation, so that the given problem can be easily solved numerically.
Modelling of microwave GaAs f.e.t. in common-gate operation
- Author(s): J. Zapata-Ferrer and B. Loriou
- Source: Electronics Letters, Volume 13, Issue 4, p. 106 –107
- DOI: 10.1049/el:19770074
- Type: Article
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The common-source and common-gate equivalent circuits of GaAs f.e.t. at microwave frequencies are established and used to simulate the variations of gain and noise figure with frequency. The results obtained explain why the experimental minimum noise figure and source admittance in the common-gate configuration are different from the theoretical expectations based on low-frequency calculations.
Novel method for amplitude measurement of signals up to microwave frequencies
- Author(s): Barrie Gilbert
- Source: Electronics Letters, Volume 13, Issue 4, p. 107 –108
- DOI: 10.1049/el:19770075
- Type: Article
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The method gives very good input/output linearity down to input amplitudes of 100 mV; by using germainum diodes, this could probably be extended down to 10 mV even lower.
Low-loss propagation in the dipole-mode along a coaxial waveguide
- Author(s): H.M. Barlow
- Source: Electronics Letters, Volume 13, Issue 4, p. 108 –110
- DOI: 10.1049/el:19770076
- Type: Article
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A theoretical investigation has been made as a step towards defining more precisely the operating conditions of a fully screened dipole-mode waveguide, comprising a coaxial structure whose inner consists of a cylindrical grid of parallel longitudinal wires separated by air and whose outer is represented by a concentric tube of continuous metal.
Novel variable-focus ultrasonic transducer
- Author(s): S.D. Bennett and J. Chambers
- Source: Electronics Letters, Volume 13, Issue 4, p. 110 –111
- DOI: 10.1049/el:19770077
- Type: Article
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A focusing p.v.f.2 transducer is described. By controlled deformation of a stretched p.v.f.2 membrane, the focal spot may be scanned axially. This action is demonstrated and is shown to correspond well with the predictions of simple theory. There are potential applications for such a device in medical imaging.
Schemes for increased output-voltage swing from operational amplifiers
- Author(s): P. Garde
- Source: Electronics Letters, Volume 13, Issue 4, p. 111 –112
- DOI: 10.1049/el:19770078
- Type: Article
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Two schemes which increase the output-voltage swing of an operational amplifier are presented. It is shown that the schemes may also give a small increase in the low-frequency gain, but they do not improve the slew-rate limit of the amplifier, as previously thought, without reducing the phase margin and degrading the transient response.
Effect of substrate temperature on d.c.-sputtered antimony-doped tin-dioxide films
- Author(s): A.G. Sabnis and Kuang-Yeh Chang
- Source: Electronics Letters, Volume 13, Issue 4, p. 113 –114
- DOI: 10.1049/el:19770079
- Type: Article
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–114
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The conductivity of d.c.-sputtered Sb-doped tin-dioxide films improves with higher substrate substrate temperatures. The conductivity is stable and is not influenced by the substrate material. Heating in open air does not deteriorate the film conductivity. The films are over 90% transparent in the visible spectrum.
Thin-film magnetostatic amplifier: analytical expressions of dispersion and gain properties
- Author(s): M. Bini ; L. Millanta ; N. Rubino
- Source: Electronics Letters, Volume 13, Issue 4, p. 114 –115
- DOI: 10.1049/el:19770080
- Type: Article
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Approximate expressions are derived which allow one to obtain the essential properties of the device. Magnetic losses are also taken into account. The results indicate that an operating device is technically feasible.
Network analysis of microwave oscillators using microstrip transmission lines
- Author(s): C.M. Krowne
- Source: Electronics Letters, Volume 13, Issue 4, p. 115 –117
- DOI: 10.1049/el:19770081
- Type: Article
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A network and computer-aided-design approach is discussed which is useful in designing microstrip oscillators to operate between 10 and 20 GHz. The analysis is applied to GaAs m.e.s.f.e.t. active devices.
Equivalent circuit of the asymmetric crossover junction
- Author(s): R.J. Akello ; B. Easter ; I.M. Stephenson
- Source: Electronics Letters, Volume 13, Issue 4, p. 117 –118
- DOI: 10.1049/el:19770082
- Type: Article
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The asymmetric crossover junction has been characterised experimentally and compared with the T-junction. This comparison indicates that the T-junction data may be used as a first step to estimate the properties of the crossover.
Effect of gain control and modulation on harmonic nonlinear operators, with application to audio signal processing
- Author(s): M.A. Gerzon
- Source: Electronics Letters, Volume 13, Issue 4, p. 118 –120
- DOI: 10.1049/el:19770083
- Type: Article
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Results are given concerning multiplication and gain control of harmonic operators, especially in the zeroth harmonic case. Various types of signal multiplication are considered, including analytic signal multiplication. These results facilitate the design of low-distortion signal processors, since many measurements of signal statistics used a control signals, e.g. correlations, are ideally zeroth harmonic.
Erratum: Dispersion characteristics of a ferrite microstrip by a transverse-mode-matching technique
- Author(s): N. Krause
- Source: Electronics Letters, Volume 13, Issue 4, page: 120 –120
- DOI: 10.1049/el:19770084
- Type: Article
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