[SI-LIST] Re: Node -1 in SPICE
- From: "Brent DeWitt" <bdewitt@xxxxxxxxxxxxx>
- To: <a.ingraham@xxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 9 Feb 2004 22:20:21 -0700
I've never seen it used in SPICE, but in Sonnet, port -1 would be the
differential drive of port 1.
Brent
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ingraham, Andrew
Sent: Monday, February 09, 2004 10:09 PM
To: SI-List
Subject: [SI-LIST] Re: Node -1 in SPICE
Negative node numbers could mean different things to different SPICE
programs.
DEC's SPICE used negative numbers within subcircuits to refer to the global
(top-level) node with the same number. Thus, node "-1" would be identical
to node "1" at the top level (without having to put the node number in the
.SUBCKT line and the subcircuit call statement). I think this handy feature
was unique to DEC's SPICE.
Some SPICEs might interpret "-1" as a non-numeric nodename, now that so many
SPICEs allow nodenames rather than numbers.
Or perhaps a minus sign appearing in a place where SPICE was expecting an
integer, might be seen by SPICE as equivalent to whitespace, thus making
"-1" identical to writing " 1".
Or maybe some SPICE-based program gives special meaning to the node "-1".
Bottom line ... I think the results depend on which program you use.
Regards,
Andy
> In LineSim, a NC circuit connection of a SPICE port node is referred to as
> node "-1". What does this "-1" node represents in the SPICE model or where
> does it connects to?
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