In message <[email protected]>,
dated Tue, 21 May 2013, "ce-test, qualified testing bv - Gert Gremmen"
<[email protected]> writes:
In RF technology it is very common to use a plane as a single grounding
point.
It isn't a single point; it may be a close approach to a single point
but I have seen trouble even at audio frequencies caused by poor layout,
due to assuming a ground plane has zero impedance. Distorted current
from a Class AB output stage was getting back into an input circuit via
the voltage drop between an output device grounding point and an input
device grounding point. The problem was discovered because one channel
had eight times the THD of the other.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
They took me to a specialist burns unit - and made me learn 'To a haggis'.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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