- Email: [email protected]
Matrix modles for reliability estimates
196
ABSTRACTS ON MICROELECTRONICS AND RELIABILITY
Considerations concerning the reliability of relay transmitters. LEUCHTMANN,Onde Elect., September (1966), pp. 931-935. (In French.) After some general comments about relay transmitters, the writer considers the particular instance of small communities and of developing areas. Limited budgets, high ambient temperatures and difficulty of access all make necessary cheap and reliable equipment. An explanation is given of how the emphasis on reliability can be applied right from the beginning of the design. It can be applied with any desired degree of emphasis to the definition of the technological requirements and the choice and use of materials. Different aspects of reliability are examined and faults of inexperience are eliminated in manufacture. In analysing the faults occurring during usage, steps are taken to ensure that they fall outside the period of useful life.
Integrated circuit design analysis by digital computer. R. A. MAMMANO,1966 1EEE International Con~ention Record, Part 9, March 21-25 (1966), p. 52. One of the first factors which became apparent with the advent of integrated circuits was that after a circuit was constructed the design engineer could no longer adjust component values to optimize its performance. While this does not represent a serious problem with digital circuits, it has proven a severe deterrent to full exploitation of linear integrated circuits. Not only are the requirements for accuracy greater in analog applications, but the tolerances of the integrated components are considerably broader than those of discrete elements. When these factors are added to the high cost of scrapping production masks if changes are necessary, the result is a much greater requirement for accurate analysis early in a circuit's development. To ensure that a circuit is completely correct prior to the investment in masks, a digital computer programmed for electronic circuit analysis becomes practically mandatory. Not only can a computer solve a complete equivalent circuit including all parasitic elements, but it can also describe the relationship of all the component tolerances to overall circuit performance. To illustrate the procedures for using such computerized circuit analysis, and the benefits it can offer, a typical analog integrated circuit design effort is described. Predicting the reliability of a system. J. C. CLULEY,Electronics and Power, October (1966), p. 361. A general article covering the wide field of reliability of electronic systems. The elementary concepts of reliability prediction are described and several examples are given. Matrix m o d e l s for reliability ostimates. W. A. FLANNERYand W. J. REICH, Jr., Electron. Technol., September (1966), p. 38..Accurate estimates of reliability and maintainability, essential to good design, are possible with new mathematical techniques. Markovian mathematical models have been used to solve problems in queueing theory. Now these powerful methods are being applied to analyse reliability and maintainability of t~team and equipment. This short article outlines a method. Graphs reveal reasons for high cost maintenance. G. W. CORLEY and H. FAECHER,Elearordcs, September 5 (1966), p. I01. Maintenance costs are a major factor in the operational costs of avionics and airborne weapons systems. About one-fourth of the annual Department of Defence budget is spent on maintenance. A nomograph is given from which the "Maintenance main-hours per flight hour" can be readily calculated. MICROF-L~.CTRONICS----GENERAL Microelectronlcs goes commercial. R. E. KOEPER,EDN, July (1966) (special feature). In "Microelectronics goes commercial" three significant areas are covered--the user's story, the devices presently available and the markets as viewed by the microcircuit and module manufacturers. To present this story cohesively the coverage is divided into nine sections: Feasibility demonstrated Microcircuits--digital and finear Focus on size Manufacturers' outlook The evaluation period Why buy modules? The learning curve A look ahead Thoughts on in-house capabilities
ABSTRACTS ON MICROELECTRONICS AND RELIABILITY
Considerations concerning the reliability of relay transmitters. LEUCHTMANN,Onde Elect., September (1966), pp. 931-935. (In French.) After some general comments about relay transmitters, the writer considers the particular instance of small communities and of developing areas. Limited budgets, high ambient temperatures and difficulty of access all make necessary cheap and reliable equipment. An explanation is given of how the emphasis on reliability can be applied right from the beginning of the design. It can be applied with any desired degree of emphasis to the definition of the technological requirements and the choice and use of materials. Different aspects of reliability are examined and faults of inexperience are eliminated in manufacture. In analysing the faults occurring during usage, steps are taken to ensure that they fall outside the period of useful life.
Integrated circuit design analysis by digital computer. R. A. MAMMANO,1966 1EEE International Con~ention Record, Part 9, March 21-25 (1966), p. 52. One of the first factors which became apparent with the advent of integrated circuits was that after a circuit was constructed the design engineer could no longer adjust component values to optimize its performance. While this does not represent a serious problem with digital circuits, it has proven a severe deterrent to full exploitation of linear integrated circuits. Not only are the requirements for accuracy greater in analog applications, but the tolerances of the integrated components are considerably broader than those of discrete elements. When these factors are added to the high cost of scrapping production masks if changes are necessary, the result is a much greater requirement for accurate analysis early in a circuit's development. To ensure that a circuit is completely correct prior to the investment in masks, a digital computer programmed for electronic circuit analysis becomes practically mandatory. Not only can a computer solve a complete equivalent circuit including all parasitic elements, but it can also describe the relationship of all the component tolerances to overall circuit performance. To illustrate the procedures for using such computerized circuit analysis, and the benefits it can offer, a typical analog integrated circuit design effort is described. Predicting the reliability of a system. J. C. CLULEY,Electronics and Power, October (1966), p. 361. A general article covering the wide field of reliability of electronic systems. The elementary concepts of reliability prediction are described and several examples are given. Matrix m o d e l s for reliability ostimates. W. A. FLANNERYand W. J. REICH, Jr., Electron. Technol., September (1966), p. 38..Accurate estimates of reliability and maintainability, essential to good design, are possible with new mathematical techniques. Markovian mathematical models have been used to solve problems in queueing theory. Now these powerful methods are being applied to analyse reliability and maintainability of t~team and equipment. This short article outlines a method. Graphs reveal reasons for high cost maintenance. G. W. CORLEY and H. FAECHER,Elearordcs, September 5 (1966), p. I01. Maintenance costs are a major factor in the operational costs of avionics and airborne weapons systems. About one-fourth of the annual Department of Defence budget is spent on maintenance. A nomograph is given from which the "Maintenance main-hours per flight hour" can be readily calculated. MICROF-L~.CTRONICS----GENERAL Microelectronlcs goes commercial. R. E. KOEPER,EDN, July (1966) (special feature). In "Microelectronics goes commercial" three significant areas are covered--the user's story, the devices presently available and the markets as viewed by the microcircuit and module manufacturers. To present this story cohesively the coverage is divided into nine sections: Feasibility demonstrated Microcircuits--digital and finear Focus on size Manufacturers' outlook The evaluation period Why buy modules? The learning curve A look ahead Thoughts on in-house capabilities