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ISSUES OF MODERN PRINTED CIRCUIT BOARD DESIGN

D. S. Bogdanov, design engineer, JSC «Space Rocket Center «Progress», Samara; This email address is being protected from spambots. You need JavaScript enabled to view it.
I. A. Bogdanova, design engineer, JSC «Space Rocket Center «Progress», Samara; This email address is being protected from spambots. You need JavaScript enabled to view it.

The article studies the problem of keeping standard requirements and methods for printed circuit board design up to date. The aim of the work is to reveal obsolete approaches for printed circuit board design, inaccurate formulas and algorithms. It is also aimed to reveal tolerance and simplifications within calculations and modeling, which are unnecessary under current circumstances. Separate parts of standards and principles, which require reassuming and optimization first, are listed. For each tolerance the possible reason for approving this tolerance is studied, and it is questioned if these reasons are still actual, and if there are some other recent circumstances requiring the approval of new kinds of tolerance. The general issue of accordance between computer models of electrical circuits and real distribution of electrical current within branches of the same net is studied. The article is concluded with the necessity of changes in standards and modeling principles.

Key words: printed circuit board, design element calculations, tolerance, standard deviation, electrical current load, track width, net branch, autorouting.

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