[SI-LIST] Re: Ground nodes in spice


Hey Fabrizio,
My personal opinion is that Node 0 is probably not your "ground" on your
backplane OR on your card. At least not if you are trying to simulate the
signal return paths accurately and not assuming perfect grounds. You have to
be careful with Node 0 because it is often used inside spice subcircuits to
help convergence issues.

my $.02

jon

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Fabrizio Zanella
Sent: Thursday, February 27, 2003 4:52 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ground nodes in spice



I have a question regarding backplane simulations of serial 8b/10b
signals, running 2.5Gbs and above.  Does it matter whether the ground
nodes of the daughtercards and backplane are all set to 'zero' or to a
floating node for eye pattern results?
Thanks,

Fabrizio Zanella
Principal Hardware Design Engineer
Broadbus Technologies
fzanella@xxxxxxxxxxxx
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