Adequate decoupling of power rails of
most circuits is a seriously underestimated
necessity. Particularly in the design
of printed-circuit boards, it often happens
that at the last moment the thought occurs
that there is no or insufficient space left for
decoupling capacitors, srnall though these
normally are. His, of course, not surprising
that such negligence often results in
spontaneous oscillation in analogue circuits
and unreliable operation of digital
circuits. Especially sequential digital circuits,
such as dividers, counters and bistables
are prone to these problems, the
causes of which are normally very difficult
to find.
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