Browsing by Author "Andonova, Anna Stoynova"

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    Reliability improvement in consequence of investigation PCB silver electrochemical migrations
    (Видавництво Національного університету "Львівська політехніка", 2002) Jordanov, Nikola Stefanov; Andonova, Anna Stoynova; Atanasova, Natasha Georgieva; Technical University of Sofia, Dept. of Microelectronics
    Looking for a compromise between high functionality and convenient and effective materials the silver has got many proved and achievements qualities for PCB. The main problem in using as a constructive materials its high disposition of migration. The investigation of a concrete type of migration between silver conductors is the goal of the paper. For this purpose an investigation techniques is presented to qualifying PCB structures. Some test structures are designed and produced and experimental results are results are analyzed.
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    Survey of quality and reliability problems in design of MEMS
    (Видавництво Національного університету "Львівська політехніка", 2002) Andonova, Anna Stoynova; Atanasova, Natasha Georgieva; Technical University – Sofia, Bulgaria
    The interdisciplinary nature of MicroElectroMechanical Systems (MEMS) utilizes design engineering and manufacturing expertise from a wide and diverse range of technical areas. In order to produce a high reliability and quality MEMS we must not only examine the device itself, but must also examine the entire process surrounding the devices, from conception to finish. This means that the process must be qualified, with the supplier fully investigated, the design verified, and the packaging certified. The paper presents a survey of the various aspects of MEMS, with emphasis on its reliability and quality features in the design phase.