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Electronics Letters

Issue 5 • Date March 25 1971

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Displaying Results 1 - 16 of 16
  • High-resolution laser homodyne interferometer

    Publication Year: 1971, Page(s):117 - 118
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    A simple Michelson interferometer, illuminated by an amplitude stabilised He-Ne laser, has been used to monitor extremely small optical-path-length variations. The instrument is capable of determining a change of 1 Å (2×10¿3 rad), with a time resolution of approximately 3 ¿s. View full abstract»

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  • Carrier multiplication in the pinchoff region of m.o.s. transistors

    Publication Year: 1971, Page(s):118 - 120
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (359 KB)

    The letter describes a theoretical model for the abnormal current in the substrate of m.o.s. transistors beyond pinchoff. It is shown that this current is due to carrier multiplying by avalanching in the pinchoff region. The corresponding drain conductance is determined. The comparison between experimental and theoretical results is given for several samples. View full abstract»

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  • Inductance changes in annular discs near an infinite conducting plane

    Publication Year: 1971, Page(s):120 - 121
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    At high frequencies, the coupling with a conducting plane is greater for an annular disc than for a conventional coil of the same outside radius. Such discs therefore have benefits in certain inductance transducers, and it is shown that an optimum ratio of the inside to the outside radii exists. View full abstract»

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  • Encapsulant for buried u.h.f. antennas

    Publication Year: 1971, Page(s):121 - 123
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (342 KB)

    Certain applications for above-ground communications require antennas placed below the ground surface. Under these conditions, reasonable antenna performance can be achieved if the antenna is encapsulated in a uniform low-loss dielectric having a relative permittivity near that of the surrounding earth. It is shown that, with special conditioning, refractory concrete is a suitable encapsulant. It ... View full abstract»

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  • Offset-voltage temperature-coefficient in dual m.o.s.f.e.t. source followers

    Publication Year: 1971, Page(s):123 - 125
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    A technique is given for predicting the approximate temperature coefficient of offset voltage of a differential m.o.s.f.e.t. source-follower arrangement incorporated in a unity-gain buffer amplifier set up for zero offset at room temperature. The prediction is dependent on only one measurement, using a bridge-circuit technique, and takes account of possible power-law differences in the nominally m... View full abstract»

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  • Generalised least-squares estimation without iteration

    Publication Year: 1971, Page(s):125 - 126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (229 KB)

    Unbiased estimates of the coefficients of a linear process and noise model are found by a noniterative least-squares method. The estimation is split into three stages, in which the residuals, noise model and process model are found separately. Results are compared with those from the usual iterative method. View full abstract»

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  • Special stability analysis for the Shichman formula

    Publication Year: 1971, Page(s):127 - 129
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    The Shichman formula for numerical integration is shown to be A stable for all step ratios a. However, for a > 1+¿2 with a negative real eigenvalue K, there is an initial instability phenomenon whose presence precludes the use of this a range. The phenomenon is absent when a <1+¿2. View full abstract»

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  • Truncation error in the analysis of aperture radiation

    Publication Year: 1971, Page(s):129 - 131
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (378 KB)

    The mode-matching technique for a flanged aperture is considered. By using the known form of the edge singularities, the mode-coupling equations are cast into a form which partially compensates for the truncation effect. The formulation is shown to recover the local-field properties and the boundary conditions in the immediate vicinity of the edges. View full abstract»

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  • State-feedback controller for systems with dead time

    Publication Year: 1971, Page(s):131 - 133
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (342 KB)

    State-variable feedback methods are used to synthetise a sampled-data controller for a linear system with transport lag. A partial plant model is used to generate the inaccessible states directly, and feedback coefficients are determined from the solution of a set of linear simultaneous equations. View full abstract»

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  • Etched Schottky-barrier m.o.s.f.e.t.s using a single mask

    Publication Year: 1971, Page(s):133 - 134
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (254 KB)

    A simplified method for fabricating silicon m.o.s. transistors using a single photographic mask is described. The source and drain regions are etched; underetching the oxide results in autoregistration of the gate. The characteristics of both Schottky-barrier and p¿n junction source and drain devices are presented. View full abstract»

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  • Complex propagation coefficients and the step discontinuity in corrugated cylindrical waveguide

    Publication Year: 1971, Page(s):135 - 136
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    The letter is concerned with the nature of evanescent modes in circumferentially corrugated cylindrical waveguide. When the longitudinal surface susceptance is small, the propagation coefficients for these modes must become complex. A knowledge of evanescent modes is necessary when discussing discontinuities in waveguides; some preliminary results for a modal analysis of the step-discontinuity pro... View full abstract»

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  • Orthogonality relationship for class of waveguide with anisotropic walls

    Publication Year: 1971
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (150 KB)

    The letter presents a proof of an orthogonality relationship ¿¿z¿(Ep×H)ds = 0 kzp ¿ kzq for waveguide modes in a class of cylindrical waveguide with uniform anisotropic walls characterised by a longitudinal impedance Zz and circumferential impedance Z¿. The usual idealisation of circumferentially corrugated waveguides belongs to this class. View full abstract»

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  • New automatic equaliser employing modulo arithmetic

    Publication Year: 1971, Page(s):138 - 139
    Cited by:  Papers (451)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    The limitations of present automatic and adaptive equalisers stem from the use of feedforward transversal filters. These drawbacks may be obviated by using a feedback transversal filter, the inverse filter, but this is only suitable for limited use since it can be an unstable circuit. It is shown that modulo arithmetic may be used in the inverse filter to eliminate completely the possibility of in... View full abstract»

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  • Longitudinal quadratic electro-optical effect in KTN

    Publication Year: 1971, Page(s):139 - 140
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (294 KB)

    The occurrence of the longitudinal quadratic electro-optic effect in potassium tantalo niobate (KTN) is reported. It is shown that this effect will occur for particular orientations in all crystals with the point group m3m. Measurements of the halfwave voltage in thin slices of KTN are in good agreement with theory. View full abstract»

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  • Improved excitation techniques for atmospheric pressure CO2 lasers

    Publication Year: 1971, Page(s):141 - 142
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    A simple and rugged electrode structure is described for the production of uniform pulse-excited discharges throughout large volumes at atmospheric pressure. Output energy densities of 18 mJ/cm3 have been achieved in a multimode CO2 laser. The performance is compared with that of a novel mesh-cathode electrode system. View full abstract»

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  • Experimental study of surface channel in insulated-gate field-effect transistor

    Publication Year: 1971, Page(s):142 - 144
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (500 KB)

    A simple experimental technique is described for measuring the effective channel length and the surface-channel drift mobility in the insulated-gate field-effect transistor. Experimental results are presented for p channel transistors made in 8 ¿ cm silicon. View full abstract»

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Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK