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Component Parts, IRE Transactions on

Issue 4 • Date December 1959

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Displaying Results 1 - 6 of 6
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  • Component-Part Screening Procedures Based on Multiparameter Measurements

    Page(s): 252 - 258
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    A screening methodology based on measurements of several parameters is proposed. The methodology provides an improved semiquantitative basis for the selection and evaluation of screening criteria The method is devised 1) to yield a minimum number of parameters required for effective screening with a linear function, 2) to determine the gain in reliability obtained by screening on the basis of two parameters rather than one, three rather than two, etc., 3) to determine the parameters which may be interchanged for measurement or cost reasons without changing the effectiveness of the screening procedure, 4) to determine the probabilities of screening out a superior component and failing to screen out an inferior component, 5) to determine the costs associated with making the screen:rig procedure more stringent, 6) to permit modification of the screening criteria for small changes in component-part design, or lot characteristics; 7) to determine the effect of alternative failure criteria on the screening criteria, and 8) to indicate when practical screening cannot be achieved using a linear function of the parameters selected for measurement. The methodology is based on a combination of standard statistical techniques, and is novel only in maintaining a tractable analysis of the over-all problem of screening individual component parts by variables inspection. View full abstract»

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  • Delay-Line Specifications for Matched-Filter Communications Systems

    Page(s): 263 - 268
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    Specifications for a wide-band multitap delay-line are rationalized by the demands of a matched-filter commtmication system employing a pair of such delay lines. The delay line is specified in terms of time-domain characteristics. View full abstract»

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  • High Dielectric Constant Ceramics

    Page(s): 238 - 251
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    Currently available high dielectric constant ceramics enjoy certain special advantages for use in capacitor design. However, there are also severe limitations which must be well understood by engineers attempting their application. This paper summarizes the principal electrical characteristics, favorable or otherwise, of these materials and attempts to relate them to well-known basic dielectric properties. In addition, a brief review of present knowledge of ferroelectricity in barium titanate is given, since many of the practical problems encountered in the use of high dielectric constant ceramics are rooted in the inherent ferroelectricity of the material. A few remarks are included concerning avenues of future advance in high-K ceramic applications. View full abstract»

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  • Some Rating and Application Considerations for Silicon Diodes

    Page(s): 269 - 273
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    The dissipation in a silicon rectifier depends on the characteristics of the rectifier (threshold voltage and ohmic resistance) and the circuit constants (inductive, resistive, or capacitive load). Dissipations under these different conditions are calculated. The maximum permissible dissipation is limited by maximum junction temperature and thermal stability. The stability criterion depends on the thermal resistance, the reverse characteristic and its change with respect to temperature, the reverse voltage, and the circuit configuration. Derating curves are obtained, based on known variations of the reverse characteristics of silicon rectifiers with temperature and voltage. The maximum permissible transient dissipation depends on the total surge energy. The energy dissipated in the rectifier is high when the load capacitance is high and the external series resistance is low. A design embodying all the foregoing considerations is illustrated. View full abstract»

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  • Aircraft Secondary Power Generator with Direct Compensation Frequency Control

    Page(s): 259 - 263
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    The variable speed constant frequency alternator system provides accurate frequency control independent of the shaft speed. The method employed is completely electrical in contrast with the more conventional mechanical speed control systems. The principle of operation depends upon a constant angular velocity magnetic field in the alternator armature, the angular velocity being the vector sum of the mechanical velocity of the shaft and the velocity of an electromagnetic rotating field induced by the excitation of a polyphase field winding. The polyphase field winding is driven by a variable frequency polyphase exciter, its frequency being directly proportional to the speed deviation from synchronous speed of the alternator rotor and shaft. The frequency control system as described in this paper is the open-loop type and, as such, accomplishes absolute frequency control with no errors arising from load or speed transients. An experimental brushless, constant frequency, three-phase alternator is discussed. View full abstract»

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Aims & Scope

This Transaction ceased production in 1962. The current publication is titled IEEE Transactions on Components, Packaging, and Manufacturing Technology.

Full Aims & Scope