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Electronics Letters

Issue 4 • Date February 22 1973

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Displaying Results 1 - 21 of 21
  • Current-zero detection in thyristor convertors

    Publication Year: 1973
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (134 KB)

    A method of detecting current zeros in thyristor convertors is described. The method utilises an optically coupled isolator to sense the voltage across each of the thyristors in the convertor, thereby detecting the conduction state of each device. This information is then processed by simple logic to detect current zeros from the convertor. View full abstract»

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  • Distributed frame synchronisation by nonlinear-shift-register sequences

    Publication Year: 1973, Page(s):73 - 75
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (409 KB)

    A class of nonlinear-shift-register sequences is proposed for use as synchronisation words in systems employing the distributed method of synchronisation. Owing to the unique properties of these sequences, it is possible to achieve fast acquisition by simple circuits, even for long frames or multiframes. View full abstract»

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  • Least-squares monotonic lowpass filters with sharp cutoff

    Publication Year: 1973, Page(s):75 - 76
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (263 KB)

    A new class of lowpass-filter functions with no finite zeros and a monotonic magnitude response is first derived by using a least-squares norm to minimise the passband attenuation, and these filter functions are then augmented by adding one pair or multiple pairs of j¿-axis zeros. The magnitude characteristics of these filters are compared with those of the generalised inverse Cheby¿shev filters... View full abstract»

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  • Complementary dynamic m.o.s. logic circuits

    Publication Year: 1973, Page(s):77 - 78
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    Allowing both p and n channel groups of transistors to be blocked between transitions of c.m.o.s. gates leads to complementary dynamic m.o.s. circuits which, in many cases, are significantly less complex than their static counterparts. The value of the concept and a method of synthesis are demonstrated with a practical example. Systematic application to frequency dividers yields very simple new st... View full abstract»

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  • Open resonator operating at 337 μm wavelength

    Publication Year: 1973, Page(s):78 - 79
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (293 KB)

    Open-resonator techniques are investigated at the sub-millimetre wavelength of 337 μm A folded spherical resonator with periodic variation of intermirror separation is excited at 33 μm using an HCN laser. Initial results show that the theoretically expected form of resonance spectra can be obtained experimentally, and that the method should be applicable for dielectric-property and... View full abstract»

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  • Floating switch with large-signal capability

    Publication Year: 1973, Page(s):79 - 80
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    Electronic switches using field-effect devices are widely used, but suffer from a low ratio of signal-waveform amplitude to control-waveform amplitude. A switch configuration is described using two devices and overcoming this disadvantage. View full abstract»

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  • Computer analysis of nullor networks

    Publication Year: 1973, Page(s):80 - 82
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    A computer program for the analysis of nullor circuits is presented. The method follows the approach of Davies, and requires the formation of the incidence matrix for the corresponding passive network. Output is available in graphical form or printed form. The program is in FORTRAN IV, and is suitable for interactive use. View full abstract»

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  • Pulsed measuring technique for isothermal transistor characteristics

    Publication Year: 1973, Page(s):82 - 83
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (254 KB)

    A procedure is described which allows the determination of the d.c. and a.c. characteristics of the bipolar transistor under defined isothermal conditions. Representative results are given illustrating the need for such temperature control. Explanations are advanced for the observed temperature dependence of transistor delay time. View full abstract»

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  • Deadbeat control of linear multivariable discrete-time systems

    Publication Year: 1973, Page(s):83 - 84
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (265 KB)

    A simple closed-form control law for the deadbeat control of a class of linear multivariable discrete-time systems is presented. View full abstract»

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  • Reply to Comments on New measurement method of Gunn-diode impedance

    Publication Year: 1973, Page(s):84 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (313 KB)

    A reply is given to comment by Charlton et al. on a letter by Hartnagel et al. which describes a method of deriving the negative conductance of X-band Gunn diodes from oscillation buildup characteristics when a steep bias-voltage step is applied. View full abstract»

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  • Microwave frequency division using transferred-electron devices

    Publication Year: 1973, Page(s):85 - 86
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    Transferred-electron devices (t.e.d.s), when biased above threshold (Vth) exhibit transit-time or circuit-controlled oscillations. This property of t.e.d.s is used to achieve dynamic division at microwave frequencies. The device is biased at 0.9¿0.95 Vth using a d.c. power source, and an input signal of 0.1¿0.3 Vth, is used to raise the device bias above threshold level. The division occurs when... View full abstract»

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  • 640 Mbit/s waveguide transmitter at 38 GHz

    Publication Year: 1973, Page(s):86 - 88
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (625 KB)

    The principle of a digital waveguide transmitter working at 38 GHz is given. A pulse-code-modulation simulator, with a bit rate of 640 Mbit/s, produces the modulation signal and also allows error-rate measurements. Typical switching times of the modulator are less than 500 ps. These results have been obtained by use of a varactor diode installed in a rectangular R band waveguide. View full abstract»

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  • Measurement of carrier-concentration profiles in epitaxial indium phosphide

    Publication Year: 1973, Page(s):88 - 89
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    A technique is described for measuring carrier-concentration profiles of vapour-deposited epitaxial indium phosphide using the capacitance/voltage characteristics of a reverse biased metal-insulator-semiconductor diode. Profiles of layers grown on chromium and tin-doped substrates are presented. The effect of dopant type on the sharpness of electrical interfaces is discussed. View full abstract»

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  • Moving-target-indicator recursive radar filter using bucket-brigade circuits

    Publication Year: 1973, Page(s):89 - 90
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (339 KB)

    A prototype clutter-rejection filter for radar is described. It uses analogue shift registers of the bucket-brigade type, which, in common with charge-coupled devices, can combine the flexibility of digital processing with the simplicity of analogue operation. Certain imperfections in the devices are shown to be particularly important for moving-target-indicator filtering. View full abstract»

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  • Resistance of earth electrodes

    Publication Year: 1973, Page(s):90 - 91
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (321 KB)

    By use of potential theory, expressions are obtained for the ohmic resistance of a slender metallic electrode located in a fluid-filled borehole. The configuration is idealised as a spheroidal confocal system. View full abstract»

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  • Thickness dependence of effective coupling factors of ZnO thin-film surface-wave transducers

    Publication Year: 1973, Page(s):92 - 93
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (321 KB)

    The effective coupling factors of ZnO thin-film surface-wave transducers are described for the various transducer arrangements; the factors are estimated from the motional conductance measurement, and their thickness dependence is shown in relation to the theoretically calculated values. View full abstract»

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  • Microstrip bandpass filters with reduced radiation effects

    Publication Year: 1973, Page(s):93 - 94
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    The realisation of a microstrip bandpass filter employing coupled hairpin-line resonators is discussed. The performance of an experimental filter at 11 GHz confirms that the low-radiation property of the hairpin resonator leads to improved behaviour compared with a coupled-resonator filter o conventional form. View full abstract»

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  • Computational estimate of applicability of infinite-array theory

    Publication Year: 1973, Page(s):94 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (395 KB)

    Measurements on a 275-waveguide-element planar array do not indicate the E plane coupling null predicted computationally on the assumption of an infinite array. A numerical method, utilising the fast Fourier transform, for determining the number of elements required to exhibit the E plane null, is presented with computed results. View full abstract»

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  • Constant-factor delta modulator

    Publication Year: 1973, Page(s):96 - 97
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    A companded delta modulator, employing an adaptation principle that produces voltages fed back to the error point in the coder which are discrete and multivalued, is achieved with just a 1 bit memory and simple signal processing, and is a significant invention. The constant-factor-delta-modulator system described here is an extension of this principle, which gives an improved signal/noise ratio at... View full abstract»

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  • Synthesis of cutpoint cellular arrays

    Publication Year: 1973, Page(s):97 - 99
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (359 KB)

    The rules for the simplification of cascades, used previously for the synthesis of cutpoint cellular arrays, are combined into only one rule, which is more general and more powerful. The efficiency of the synthesis algorithm is increased from 80% to almost 100%. View full abstract»

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  • Locating a horizontal magnetic dipole buried in a 2-layer earth

    Publication Year: 1973
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (250 KB)

    The possibility of applying an electromagnetic technique to locate a horizontal magnetic dipole buried in the upper layer of a 2-layer earth is studied. Results for a highly conducting substratum for various source depths and frequencies are presented. 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