Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 5, 8 March 1968
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Volume 4, Issue 5
8 March 1968
Microwave conductivity of polar semiconductors in the presence of a high electric field
- Author(s): H. Kopetz and H.W. Pötzl
- Source: Electronics Letters, Volume 4, Issue 5, p. 79 –80
- DOI: 10.1049/el:19680063
- Type: Article
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p.
79
–80
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Theoretical results are presented for the small-signal microwave conductivity of nInSb at TL = 77°K in the presence of a high d.c. field directed parallel or perpendicular to the microwave field. Reasonable agreement with experiments by Richter and Bonek is demonstrated. At frequencies below 50GHz, the parallel microwave conductivity is smaller than the perpendicular one, whereas the opposite is true at 70GHz.
Reduction of flicker noise in transistor amplifiers
- Author(s): E.A. Faulkner and J.B. Grimbleby
- Source: Electronics Letters, Volume 4, Issue 5, p. 80 –81
- DOI: 10.1049/el:19680064
- Type: Article
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p.
80
–81
(2)
An amplifier has been built using the chopper technique suggested by Baxandall. A low-frequency noise figure of 6dB has been obtained, but in the region of 1 Hz upwards, a simple bipolar or f.e.t. circuit will give a better performance.
Logical circuits for use in iterative arrays
- Author(s): K.J. Dean
- Source: Electronics Letters, Volume 4, Issue 5, p. 81 –82
- DOI: 10.1049/el:19680065
- Type: Article
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p.
81
–82
(2)
Two logical circuits are proposed, and some examples of iterative arrays formed using them are discussed.
Effect of source pattern on wedge diffraction
- Author(s): L. Lewin
- Source: Electronics Letters, Volume 4, Issue 5, p. 82 –83
- DOI: 10.1049/el:19680066
- Type: Article
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p.
82
–83
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On considering multipole sources, the effect of pattern variation at an edge is evaluated and applied to determine the correction for an edge illuminated at a shadow boundary.
Simple theory for improving the efficiency of Gunn oscillators
- Author(s): P.H. Ladbrooke and J.E. Carroll
- Source: Electronics Letters, Volume 4, Issue 5, p. 83 –85
- DOI: 10.1049/el:19680067
- Type: Article
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p.
83
–85
(3)
The letter considers improvements in efficiency to be expected from varying the area or donor-density profile of a Gunn device. A method is given to design a diode theoretically capable of efficiencies approaching 40% for the best-quality GaAs with a peak/valley ratio approaching 3.
Summed sensitivity of network functions
- Author(s): A.G.J. Holt and J.K. Fidler
- Source: Electronics Letters, Volume 4, Issue 5, p. 85 –87
- DOI: 10.1049/el:19680068
- Type: Article
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p.
85
–87
(3)
An expression for the sum of the sensitivities of a network function with respect to the network components is derived. This is shown to be directly related to the network function in certain cases.
New gyrator circuits obtained by using nullors
- Author(s): A. Antoniou
- Source: Electronics Letters, Volume 4, Issue 5, p. 87 –88
- DOI: 10.1049/el:19680069
- Type: Article
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p.
87
–88
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It is proved that an infinite-gain controlled source (of any type) is equivalent to a nullor. On using this equivalence, two new gyrator circuits, using operational amplifiers, are realised.
Design of feedback networks by the use of 2-port methods
- Author(s): A.C. Ponder
- Source: Electronics Letters, Volume 4, Issue 5, page: 89 –89
- DOI: 10.1049/el:19680070
- Type: Article
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p.
89
(1)
An amplifier modified by a parallel feedback network is discussed. Explicit solutions of the circuit equations can be used to obtain the required behaviour of the elements of the feedback network.
Poincare's index for double points of a second-order autonomous recurrence
- Author(s): J.P. Babary ; A. Giraud ; C. Mira
- Source: Electronics Letters, Volume 4, Issue 5, p. 90 –91
- DOI: 10.1049/el:19680071
- Type: Article
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p.
90
–91
(2)
Using Neimark's result, Poincare's index is defined for different types of double points of an autonomous second-order recurrence, in the absence of a critical case. A necessary condition is given for the existence of a closed trajectory surrounding a number of double points.
Conditions for optimum noise performance in l.f. amplifiers employing junction f.e.t.s
- Author(s): K.F. Knott
- Source: Electronics Letters, Volume 4, Issue 5, page: 92 –92
- DOI: 10.1049/el:19680072
- Type: Article
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p.
92
(1)
Increasing the drain current of an f.e.t. can result in an improvement of the noise performance at medium frequencies, but, owing to changes in the noise spectrum of the device, a deterioration of the low-frequency noise performance can result. Measurements in the frequency range 1 Hz–1 kHz on some low-noise samples of f.e.t.s show that the drain current is not critical up to a limit, but, above this limit, the noise performance below 10 Hz deteriorates rapidly.
Determination of Laplace-Poisson domain interface
- Author(s): J.A. Magowan and W.D. Ryan
- Source: Electronics Letters, Volume 4, Issue 5, p. 93 –94
- DOI: 10.1049/el:19680073
- Type: Article
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p.
93
–94
(2)
A method is outlined for the determination of an interface boundary between two domains defined by Poisson's and Laplace's equations, respectively. The particular solution for a junction f.e.t. is considered.
Current waves on an infinite cylindrical antenna in a warm plasma
- Author(s): D.T. Nguyen
- Source: Electronics Letters, Volume 4, Issue 5, p. 94 –95
- DOI: 10.1049/el:19680074
- Type: Article
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p.
94
–95
(2)
The current waves on the outside wall of an infinite cylindrical antenna, fed by a delta-function generator and immersed in a warm isotropic plasma, which is in direct contact with the antenna, is separated into its components: the familiar e.m. wave, the ‘transverse-plasma’ wave and the slow surface wave.
Damping of surface (sound) waves by the air
- Author(s): G. Bradfield
- Source: Electronics Letters, Volume 4, Issue 5, p. 95 –96
- DOI: 10.1049/el:19680075
- Type: Article
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p.
95
–96
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The letter relates to the substitution of e.m. circuit elements by transducers and, for example, sound-wave delay elements. Experimental and theoretical considerations suggest, however, that, with surface (sound)-wave elements, reradiation into the air can augment substantially the attenuation already existing owing to internal friction and scattering.
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