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Electronics Letters

Issue 7 • Date April 5 1968

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Displaying Results 1 - 21 of 21
  • Frequency transformations for digital filters

    Publication Year: 1968 , Page(s): 115 - 116
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (207 KB)  

    Digital-filter transformations are presented from a `normalised¿-lowpass-digital-filter point of view. These results are, essentially, extensions to the results given in a previous communication. View full abstract»

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  • Generalisation of the symmetry properties of gyrators and n.i.c. circuits

    Publication Year: 1968 , Page(s): 116 - 117
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (225 KB)  

    This letter presents a 4-pole, called a symmetrisor, by analogy with the rotator introduced by Chua. It has the property that the characteristic curve observed to one port is the characteristic curve of the element connected to the other port transformed by a symmetry relative to a prescribed line through the origin. View full abstract»

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  • Iterative method of realisation of linearly separable switching functions

    Publication Year: 1968 , Page(s): 118 - 119
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    The minterms of the switching function expressed as decimal numbers are first partitioned into different groups according to the number of true inputs. An order of the weights and their signs can now be found easily. Secondary and higher orderings can also be found partially. An iteration procedure is next started by assigning values to the weights until a contradiction is reached. A new assignment is then chosen, guided by the nature of the contradiction, and this process is continued until the realisation is achieved. An example is worked out. View full abstract»

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  • Synchronisation of two Qswitched solid-state lasers

    Publication Year: 1968
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (143 KB)  

    We describe an apparatus which synchronises two Qswitched lasers of either the same or different wavelengths. Both pulses can be either simultaneous (with a 5 ns jitter) or separated by a predetermined time delay (up to 5 ¿s). View full abstract»

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  • Initial growth of domains in Gunn oscillators

    Publication Year: 1968 , Page(s): 120 - 121
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (227 KB)  

    An expression is given for the initial growth of domain voltage. A condition for domain growth is also derived. View full abstract»

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  • Plane waves in a magnetoionic medium

    Publication Year: 1968 , Page(s): 121 - 123
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (454 KB)  

    With a view to elucidating the difficulties inherent in the treatment of wave propagation in a magnetoionic medium in terms of homogeneous plane waves, the theory of homogeneous plane waves in such a medium is reviewed with particular emphasis on the properties of the time-averaged Poynting vector. View full abstract»

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  • Optimisation technique in delay-equaliser design by digital computer

    Publication Year: 1968 , Page(s): 123 - 126
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (569 KB)  

    This letter presents the necessary modifications in a method of synthesis of phase equalisers, which has been described in a companion paper, in order to make it suitable for automatic computation of phase equalisers of minimum complexity that will correct the assigned delay characteristic to within a prescribed error. The flow diagram for the program organisation is also given. View full abstract»

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  • Topology of a store-and-forward net

    Publication Year: 1968 , Page(s): 126 - 127
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (321 KB)  

    Bounds are obtained for the minimum average delay of equal-length messages in a store-and-forward net when the traffic level is low. Specific network topologies are shown to achieve the bound when the traffic is also uniform. View full abstract»

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  • Transistor-tunnel-diode ternary-logic circuits

    Publication Year: 1968 , Page(s): 127 - 128
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    Two new basic circuits for ternary-logical operations are described. Analogue simulation and experimental measurements confirm that the switching speeds of the ternary circuits can be comparable with those in similar binary circuits. It is concluded that a marginal improvement in processing rate may be achieved with ternary logic using transistor-tunnel-diode logic circuits. View full abstract»

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  • Lyapunov functionals for a class of wave equations

    Publication Year: 1968 , Page(s): 128 - 130
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (410 KB)  

    For a class of wave equations, a method of determining a suitable Lyapunov functional guaranteeing asymptotic stability is developed. The method is based on the construction of Lyapunov functions for ordinary differential equations. For a particular example, results identical to those determined from an eigenfunction expansion are obtained. View full abstract»

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  • Temperature-compensated analogue multiplier

    Publication Year: 1968 , Page(s): 130 - 131
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (290 KB)  

    Experimental results are reported on a new logarithmic-diode multiplier circuit. The design features a simple economical circuit with inherent temperature compensation, and achieves a moderate accuracy. View full abstract»

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  • Calculated mode conversion at the sunrise boundary in the Earth-ionosphere waveguide

    Publication Year: 1968 , Page(s): 131 - 132
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (305 KB)  

    Mode conversion of v.l.f. radio waves in the Earth-ionosphere waveguide is considered. It is indicated that the transition distance ¿d between day and night may be deduced, in a semiquantitative manner, from the observed fading characteristics. Values of ¿d in the range 300¿700 km are suggested. View full abstract»

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  • Magnetostatic surface waves on a y.i.g. slab

    Publication Year: 1968 , Page(s): 132 - 134
    Cited by:  Papers (20)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (401 KB)  

    Magnetostatic surface waves are identified in microwave-frequency experiments with a single-crystal y.i.g. slab. Slow travelling waves having k numbers that are high in the magnetostatic range are studied in a pulse experiment, and fast waves with k numbers low in the range are observed in a c.w. test. View full abstract»

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  • X band travelling-wave light-intensity modulator using ZnS crystals

    Publication Year: 1968 , Page(s): 134 - 135
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (303 KB)  

    A travelling-wave light-intensity modulator is described which uses two natural crystals of ZnS. This prototype needs a peak microwave pulse of 2 kW for 45% modulation, and has an overall bandwidth of 15% at 9.75 GHz. View full abstract»

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  • High-frequency coaxial cables

    Publication Year: 1968 , Page(s): 135 - 137
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (474 KB)  

    It is shown that simple transmission-line theory leads to agreement with Millington and radical conflict with Barlow concerning the effect of dielectric layers on the conducting walls of a high-frequency coaxial cable. Suggestions are given of possible sources of error in Barlow's analysis of the power-flow method, and mention is made of the Riccati equation satisfied by the ratio Ex/H¿, with an approximate solution agreeing with Millington's results. The experimental values of attenuation reported by Barlow and Sen are therefore, as yet, unexplained theoretically. View full abstract»

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  • Variable electronic allpass delay networks

    Publication Year: 1968 , Page(s): 137 - 139
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    The m.o.s.t. analogue switch has provided the opportunity for a fresh study of allpass delay networks using the sample-and-store principle. This letter describes networks designed to produce a delay which can be controlled precisely by an externally applied sampling signal. They are suitable for realisation as integrated circuits, one example comprising a 1 in-square thin-film circuit with one m.o.s.t. integrated circuit and one bipolar circuit attached. This type of circuit is seen as the replacement for the bulky and expensive fixed-delay networks used at present for the transversal filter, the basic element of automatic and adaptive equalising systems for high-speed data transmission, with the added versatility of variable delay. View full abstract»

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  • Interpolation on the ω axis

    Publication Year: 1968 , Page(s): 139 - 140
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (253 KB)  

    A variant of the well known method of interpolation in the network sense due to Smilen is presented; with this variant, a saving of reactive elements may be obtained in the transformerless case. View full abstract»

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  • Raised trigonometric and hyperbolic power lines

    Publication Year: 1968 , Page(s): 140 - 142
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    A method is described for determining the solutions of transmission lines with various trigonometric and hyperbolic distributions which have not been embraced by any previous general class of lines. It is shown that Su's lines can be deduced from the corresponding power lines. View full abstract»

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  • Erratum: Performance index based on the correlation between the responses of two systems

    Publication Year: 1968
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    First Page of the Article
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  • Erratum: Logical circuits for use in iterative arrays

    Publication Year: 1968
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    First Page of the Article
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  • Erratum: Simplified quadrature network

    Publication Year: 1968
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    First Page of the Article
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Aims & Scope

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