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Radio and Electronic Engineer

Issue 1 • Date July 1969

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Displaying Results 1 - 10 of 10
  • The exhibition season

    Publication Year: 1969
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (123 KB)  

    First Page of the Article
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  • Current developments in computer hierarchies for industrial control

    Publication Year: 1969
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (947 KB)  

    The paper reviews the present trends in the use of computers for process control through the combined experiences of the activities of the authors' organizations in the field. Examples quoted showing the wide range of application which has to be covered include integrated production control, hierarchical control and direct digital control. Conclusions are drawn about the effect which the requireme... View full abstract»

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  • A novel method for analysing singly-occurring pulses with nanosecond resolution

    Publication Year: 1969 , Page(s): 13 - 16
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (500 KB)  

    The system is designed to record pulse-shape information of singly occurring pulses with rise-times down to 1 ns. The basic theory of the `interrogate pulse¿ sampling scheme is described and a system to implement this scheme is outlined. The proposed system employs short term analogue storage of the sampled input, followed by a fast multiplexed analogue to digital converter and digital storage. S... View full abstract»

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  • The physical basis of current noise

    Publication Year: 1969 , Page(s): 17 - 22
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (837 KB)  

    The characteristics of typical 1/f noise spectra which have been observed, and the physical models proposed for their explanation, are reviewed. In m.o.s. transistors the 1/f spectrum extends over at least ten decades, and the effect of the gate field on the frequency index has been investigated. It is argued that these measurements support the theory that the conductivity of the inversion layer f... View full abstract»

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  • A linear temperature control system using thyristors

    Publication Year: 1969 , Page(s): 23 - 27
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (481 KB)  

    The problem of the precise control of the temperature of liquid flowing through a tank containing a heater is one which is important and familiar in the process-control industry. When the heater is electrical the thyristor is a natural choice for the main controller. A simple and novel method of triggering the thyristors is described in which the power dissipated in the heater is a linear function... View full abstract»

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  • Simple multi-level logic circuit design

    Publication Year: 1969 , Page(s): 28 - 32
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (445 KB)  

    A pencil-and-paper method of designing multi-level logic circuits is presented. The approach is intuitive rather than systematic. It bears the same relation to the design of circuits with gates of limited fan-in (as is the case with most microcircuit families) as does the Karnaugh-map method to two-level circuits and gates with unlimited fan-in, NAND/NOR systems are considered, and a graphical pro... View full abstract»

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  • On the theory of logorithmic silicon diodes

    Publication Year: 1969 , Page(s): 33 - 39
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1079 KB)  

    A logarithmic diode is defined as one showing a forward characteristic I ¿ exp (eV/mkT) where the factor m is independent of voltage (though not necessarily of temperature) over at least four decades of current. Many commercial diodes show such a characteristic with m in the region of 1.5. It is shown that this behaviour cannot be explained by the theory of Sah, Noyce and Shockley and a modified ... View full abstract»

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  • Higher-order active networks with one active element

    Publication Year: 1969 , Page(s): 41 - 48
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1061 KB)  

    Higher-order active networks using the Horowitz decomposition and only one active element (amplifier, negative impedance converter) are considered. Such networks are particularly sensitive to the changes of theactive element and can eventually start oscillations. The stability of these networks is studied and it is shown that a special design can virtually eliminate the danger of oscillations for ... View full abstract»

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  • An algorithm to evaluate the logarithm of a number to base 2, in binary form

    Publication Year: 1969 , Page(s): 49 - 50
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (154 KB)  

    This algorithm evaluates, in binary form, log2N for a given value of N > 0 using steps which are easily reproduced by logic blocks. It is also possible to extend this to obtain 2x, the antilogarithm to base 2 of a given num ber x. View full abstract»

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  • Frequency-dependence of a balun evaluated by a frequency transformation

    Publication Year: 1969 , Page(s): 51 - 55
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (375 KB)  

    By using a network transformation the frequency dependence of the balancing and matching properties of a transmission-line balun can be evaluated by studying rational network functions. View full abstract»

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