Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 6, 21 March 1974
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Volume 10, Issue 6
21 March 1974
Gunn effects in InxGa1−xSb (0 ≤ x ≤ 0.16)
- Author(s): A. Hojo and I. Kuru
- Source: Electronics Letters, Volume 10, Issue 6, p. 61 –62
- DOI: 10.1049/el:19740047
- Type: Article
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p.
61
–62
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Gunn effects in InxGa1−xSb (0 ≤ x ≤ 0.16) have been observed. To observe the Gunn effect, a condition nL/nΓ ≤ 0.1 or, equivalently, ΔELΓ ≥ 6.4kT should be satisfied in the crystals. The threshold fields for the Gunn effect in the crystals were in the range of 0.6−1.0 kV/cm.
Tem waveguide coupling in presence of short-circuited slot
- Author(s): G.A. Hockham
- Source: Electronics Letters, Volume 10, Issue 6, p. 62 –63
- DOI: 10.1049/el:19740048
- Type: Article
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p.
62
–63
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A method of minimising the E plane coupling between two waveguides is to introduce a quarter-wave slot between them. This letter examines theoretically the influence of the slot depth on the reflection coefficient and coupling. The useful bandwidth is shown to be of the order of 4%.
Acoustic-surface-wave disc delay lines
- Author(s): I.M. Mason ; E. Papadofrangakis ; J. Chambers
- Source: Electronics Letters, Volume 10, Issue 6, p. 63 –65
- DOI: 10.1049/el:19740049
- Type: Article
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63
–65
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An acoustic-surface-wave beam, launched along the chord of a disc, will fold compactly into an extended delay path. The rounded edges of the disc act as geodesic lenses. Beam-guiding can be obtained by repetitive focusing at the edge. A 96 μs 41 MHz prototype disc delay line is described.
Switching in thin polycrystalline films of CoO and CoO(Li)
- Author(s): B. Lalevic ; N. Fuschillo ; W. Wang ; B. Kuliyeg
- Source: Electronics Letters, Volume 10, Issue 6, p. 65 –66
- DOI: 10.1049/el:19740050
- Type: Article
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p.
65
–66
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Switching from the high- to the low-resistance state has been studied in thin polycrystalline films of CoO and CoO(Li). The sum of the delay τd and switching time τs is 0.01 μs and the recovery time is τr is 0.1 μS. The threshold field for switching is 4.6×105 V/cm for undoped CoO, which is reduced to 9.3×103 V/cm in Li-doped films. The conduction mechanism of these films is determined.
Bidirectional thin-film lumped-element circulator
- Author(s): M. Kitliński
- Source: Electronics Letters, Volume 10, Issue 6, p. 66 –68
- DOI: 10.1049/el:19740051
- Type: Article
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p.
66
–68
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The possibility of making a ‘bidirectional’ thin-film ferrite lumped-element circulator (l.e.c.) has been deduced after a detailed analysis of the scattering-matrix eigenvalues' frequency dependence has been made. The bidirectional effect is obtained for two different frequencies that are not simply related.
Characteristics of periodic acoustic-surface-wave grating filters
- Author(s): R.D. Weglein and O.W. Otto
- Source: Electronics Letters, Volume 10, Issue 6, p. 68 –69
- DOI: 10.1049/el:19740052
- Type: Article
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p.
68
–69
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Periodic surface-wave gratings may be used for the implentation of narrow-bandwidth filters that are particularly advantageous at high frequencies. Two configurations are described that offer substantially different percentage bandwidths. The metallic-film implementation reported here offers the advantage of a single-step lithography, by which the entire filter pattern is fabricated.
Design of minimum-phase digital filters from linear-phase prototypes
- Author(s): F.E. Burris
- Source: Electronics Letters, Volume 10, Issue 6, p. 69 –70
- DOI: 10.1049/el:19740053
- Type: Article
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p.
69
–70
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General methods are described for transforming any linear-phase f.i.r. filter into one having minimum phase, half the degree and a magnitude response that is (or approximates to) the square root of that of the original linear-phase filter.
Comment on ‘Some errors in the calculation of the radiation patterns of reflector antennas, using Kirchhoff integration’
- Author(s): H.A.J.M. van Hoof
- Source: Electronics Letters, Volume 10, Issue 6, p. 70 –71
- DOI: 10.1049/el:19740054
- Type: Article
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70
–71
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Probability-density function of output of single-bit cross-correlator for detecting Gaussian reflections in noise
- Author(s): J.E. Howard
- Source: Electronics Letters, Volume 10, Issue 6, p. 71 –72
- DOI: 10.1049/el:19740055
- Type: Article
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p.
71
–72
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The detection errors of a single-bit digital crosscorrelator for detecting bandlimited Gaussian reflections in noise are investigated, and the probability-density function of the correlator output due to finite-interval crosscorrelation and corruption of the received waveform by wideband Gaussian noise is derived and compared with experimental results.
Mesh-star transformation
- Author(s): V.V. Bapeswara Rao and V.K. Aatre
- Source: Electronics Letters, Volume 10, Issue 6, p. 73 –74
- DOI: 10.1049/el:19740056
- Type: Article
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p.
73
–74
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An equivalent star network exists for a given mesh network if the latter satisfies the Wheatstone relaflonship. Using this fact, it is shown that all the offdiagonal cofactors of the datum-node admittance matrix of such a mesh network are equal. From this property, a simple relationship between the elements of the two networks is derived.
Computer modelling of low-noise indium-phosphide amplifiers
- Author(s): J.E. Sitch
- Source: Electronics Letters, Volume 10, Issue 6, p. 74 –75
- DOI: 10.1049/el:19740057
- Type: Article
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p.
74
–75
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Computer modelling shows how the use of a cathode contact that restricts the amount of space charge injected into the bulk material can improve the noise performance of a transferred-electron amplifier. An example of an n+-p-n-n+ InP amplifier with a predicted noise measure of 4dB at 17 GHz is presented.
Stability of 1st-order thyristor-bridge control system
- Author(s): M.S. Ismail and P. Bertrand
- Source: Electronics Letters, Volume 10, Issue 6, p. 75 –77
- DOI: 10.1049/el:19740058
- Type: Article
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p.
75
–77
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A nonlinear difference equation that corresponds to a 2-phase thyristor bridge supplying an inductor-resistor series load and using an inverse-cosine control scheme is shown to converge uniformly, and the global asymptotic stability of the system is established rigorously.
P.C.M. counter-coder principle for segmented a law
- Author(s): T.A. Ramstad and S. Andresen
- Source: Electronics Letters, Volume 10, Issue 6, p. 77 –78
- DOI: 10.1049/el:19740059
- Type: Article
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77
–78
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A p.c.m. counter-coder for the segmented A law is described. The suggested compression technique takes advantage of the exponential voltage decay in an RC circuit and the linear decay in a circuit composed of a capacitor and a current sink. The necessary number of counter steps per sample is 38 for an 8-digit code.
Class of nonorthogonal transformations for signal processing
- Author(s): R.C. French and R.F. Mitchell
- Source: Electronics Letters, Volume 10, Issue 6, p. 78 –79
- DOI: 10.1049/el:19740060
- Type: Article
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p.
78
–79
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A class of nonorthogonal transformations is described in which the reference waveforms are circularly shifted versions of a single sequence. The sequence must have a 2-level auto-correlation functton: Barker and pseudonoise sequences are examples. The transformation is believed to have applications in impulsive-noise reduction.
Sequential design of linear multivariable systems retaining full output feedback
- Author(s): D.H. Owens
- Source: Electronics Letters, Volume 10, Issue 6, p. 79 –80
- DOI: 10.1049/el:19740061
- Type: Article
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p.
79
–80
(2)
The sequential method for multivariable-control-system design is reformulated to include full output feedback at each stage in the design process. The approach is shown to ease some of the nonminimum-phase properties of the original method.
Image scanning by acousto-electro-optic interaction
- Author(s): M. Luukkala and P. Meriläinen
- Source: Electronics Letters, Volume 10, Issue 6, p. 80 –81
- DOI: 10.1049/el:19740062
- Type: Article
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p.
80
–81
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A method is described whereby optical images can be acoustically scanned by the sound reflections caused by the light on a photosensitive surface-wave delay line at 75 MHz. A resolution of 0.2 mm on the delay line has been obtained.
Phase-interpolation locking: new technique for beam-steered active antennas
- Author(s): A.L. Cullen
- Source: Electronics Letters, Volume 10, Issue 6, p. 81 –82
- DOI: 10.1049/el:19740063
- Type: Article
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p.
81
–82
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A new method of phase control for beam steering an active antenna array is suggested. Only half the normal number of phase shifters are needed, but there is a limit to he angle throught whih the beam ca be steered by this technique.
Inverse random describing function
- Author(s): D.P. Atherton
- Source: Electronics Letters, Volume 10, Issue 6, p. 82 –83
- DOI: 10.1049/el:19740064
- Type: Article
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p.
82
–83
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A solution to the problem of evaluating a nonlinearity that yields a given random describing function is given. Approximate methods are discussed for cases where the describing function is only known graphically.
A.S.W.-convolver bilinear-coefficient variation on y-cut lithium niobate
- Author(s): M.D. Motz and I.M. Mason
- Source: Electronics Letters, Volume 10, Issue 6, p. 83 –84
- DOI: 10.1049/el:19740065
- Type: Article
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p.
83
–84
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A simple technique is described for measuring the variation with angle of a.s.w.-convolver efficiency. Experimental results are given for y-cut LiNbO3.
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