Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 23, 15 November 1973
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Volume 9, Issue 23
15 November 1973
Modified diffraction coefficients for focusing reflectors
- Author(s): G.L. James and G.T. Poulton
- Source: Electronics Letters, Volume 9, Issue 23, p. 537 –538
- DOI: 10.1049/el:19730395
- Type: Article
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A modification to the halfplane diffraction coefficients is given for a plane wave incident on a curved screen. The result is used to calculate the near field of a parabolic reflector under plane-wave illumination. Comparison with the physical-optics method shows excellent agreement.
Power limitation of punchthrough injection transit-time oscillators
- Author(s): D. Delagebeauderf and J. Lacombe
- Source: Electronics Letters, Volume 9, Issue 23, p. 538 –539
- DOI: 10.1049/el:19730396
- Type: Article
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The letter shows that the limitation on the output power of a punchthrough injection transit-time oscillator can be explained by assuming that the voltage excursion at the injection region is of the order of one-half the build-in potential. A simple calculation gives the maximal power and the optimal current, in a reasonable agreement with experimental results.
Acousto-optic TE0-TM0 mode conversion in a thin film of amorphous tellurium dioxide
- Author(s): Yoshiro Omachi
- Source: Electronics Letters, Volume 9, Issue 23, p. 539 –541
- DOI: 10.1049/el:19730397
- Type: Article
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TE0-TM0 mode conversion by acousto-optic effects has been demonstrated using an amorphous-tellurium-dioxide optical waveguide and α quartz substrate. An acoustic surface wave with a frequency of 160 MHz was used to induce photoelastic coupling in the waveguide. The incident angle of the optical beam with respect to the acoustic wavefront for obtaining TE0-TM0 crosscoupling agrees well with the value predicte from abnormal Bragg diffraction.
New mute for land mobile radio receivers
- Author(s): W. Gosling
- Source: Electronics Letters, Volume 9, Issue 23, p. 541 –542
- DOI: 10.1049/el:19730398
- Type: Article
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A new mute for mobile radio receivers is described that combines the characteristics of noise and tone mutes. Use is made of a bandstop within the speech passband. Satisfactory muting depends on the appropriate choice of filter band-widths and circuit time constants.
Computer evaluation of network S parameters
- Author(s): D.G.W. Ingram
- Source: Electronics Letters, Volume 9, Issue 23, p. 542 –543
- DOI: 10.1049/el:19730399
- Type: Article
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The letter describes a technique for evaluating the scattering parameters of a network by the use of a standard nodal-circuit-analysis program.
Correction of microwave-network-analyser measurements of 2-port devices
- Author(s): O.J. Davies
- Source: Electronics Letters, Volume 9, Issue 23, p. 543 –544
- DOI: 10.1049/el:19730400
- Type: Article
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Explicit expressions are presented for the correction of the scattering parameters of 2-port devices when measured by a microwave network analyser. The expressions avoid the necessity for iterative methods, and hence improve the computational efficiency and simplify programming when applied to an automated network analyser.
Charging of spacecraft materials simulated in a scanning electron microscope
- Author(s): K.G. Balmain
- Source: Electronics Letters, Volume 9, Issue 23, p. 544 –546
- DOI: 10.1049/el:19730401
- Type: Article
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The scanning electron microscope has been used to apply electric charge to spacecraft insulating materials, and to photograph the resulting patterns of charge distribution. Anomalies, possibly microscopic discharges, have been observed, usually associated with strong differential charging between adjacent regions of the same material. In thin materials, electron-beam penetration, temporarily induced conductivity and permanent subsurface damage have been identified.
Duality principle for asynchronous control circuits for directed graphs
- Author(s): B.V. Howard
- Source: Electronics Letters, Volume 9, Issue 23, p. 546 –547
- DOI: 10.1049/el:19730402
- Type: Article
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The directed graph provides a means of analysing parallel computer structures, whether implemented in hardware or software. This letter discusses the asynchronous circuit modules used to implement the control section of such systems, and indicates a duality principle that permits a wider variety of control functions to be envisaged.
Deadbeat control of discrete-time systems incorporating deadbeat discrete-time observers
- Author(s): B. Porter
- Source: Electronics Letters, Volume 9, Issue 23, p. 547 –548
- DOI: 10.1049/el:19730403
- Type: Article
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A simple method is presented for the design of controllers and observers that results in the deadbeat behaviour of a class of linear multivariable discrete-time plants with inaccessible state vectors.
Derivation of current/voltage characteristics for graded heterojunctions
- Author(s): W.F. Hall
- Source: Electronics Letters, Volume 9, Issue 23, p. 548 –549
- DOI: 10.1049/el:19730404
- Type: Article
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Current/voltage characteristics for graded heterojunctions are derived from an extension of the theoretical model for graded-gap semiconductors.
Data-transmission characteristics of railway track
- Author(s): B. Mellitt
- Source: Electronics Letters, Volume 9, Issue 23, p. 550 –551
- DOI: 10.1049/el:19730405
- Type: Article
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Command data may be transmitted to a train by using the track as an inductive link. The letter gives measurements of the transmission characteristics of the track, and proposes a method of reducing signal attenuation that uses capacitors connected between the rails.
Equivalent capacitances of T junctions
- Author(s): P. Stouten
- Source: Electronics Letters, Volume 9, Issue 23, p. 552 –553
- DOI: 10.1049/el:19730406
- Type: Article
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Some new results are given for the capacitance that represents the excess of charge on art asymmetric T junction. This is done by the method of Benedok and Silvester.
Comparison of metal-n-p+ and p+ BARITT small-signal noise measures
- Author(s): J. Christie and J.A.C. Stewart
- Source: Electronics Letters, Volume 9, Issue 23, p. 553 –555
- DOI: 10.1049/el:19730407
- Type: Article
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p+-n-p+ BARITT diodes offer optimum noise measures of approximately 9 dB. A small-signal computer simulation is used to compare the noise measures of p+-n-p+ and metal-n-p+ (m-n-p+ diodes. For the range of operating conditions studied, the noise measures of the m-n-p+ diodes are consistently greater than the corresponding noise measures of the p+-n-p+ diodes.
Optimisation of depletion-mode transistors for an m.o.s. p-channel technology
- Author(s): W. Schemmert and B. Höfflinger
- Source: Electronics Letters, Volume 9, Issue 23, p. 555 –556
- DOI: 10.1049/el:19730408
- Type: Article
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Recent advances in p-channel m.o.s. integrated circuits are the result of using depletion-mode load transistors which provide currents proportional to the square of their threshold voltage. Using ion implantation, limits are set to the maximum obtainable threshold voltage depending on the implantation parameters. Their systematic investigation is reported and the resulting optimum parameters for threshold voltage shifts exceeding 6 V are given.
Erratum: Cellular dynamic memory array with reduced data-access time
- Author(s): W. Kluge
- Source: Electronics Letters, Volume 9, Issue 23, page: 556 –556
- DOI: 10.1049/el:19730409
- Type: Article
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