interesting article in the new 'printed circuit design' mag (june 2001)
by Henry W. Ott (EMI consultant)
title: 'partitioning and layout of a mixed signal pcb'
in it he basically makes the case that split planes are generally a bad
thing
their best use he says is to correct a badly laid out board after the
fact and also in some cases they are needed for safety isolation
but as to localizing noise (preventing polution of low level signals)
and minimizing EMI nothing beats a *properly laid out* (i.e.
'routed/placed') board with a single ground plane possessing a single
net
he also advocates something i learned in a recent job which is much
easier to do than full splits and separate nets, namely ground 'cuts'
these are breaks in the plane so that currents are forced to circulate
locally, then a 'bridge' (plane section) is created over which traces
are passed which connect the sections
i won't go into all that he has covered but as the split planes are so
pervasive and enough of a nuisance to implement i thought i would throw
this out there
Dennis Saputelli
--
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