[SI-LIST] Re: Combining DC and TRANS analysis
- From: "Cove, Stephen E" <stephen.e.cove@xxxxxxxxx>
- To: <Andrew.Ingraham@xxxxxx>, <si-list@xxxxxxxxxxxxx>,<SKWONG@xxxxxxxxxx>
- Date: Mon, 20 Jan 2003 10:31:28 -0800
According to the 1996 HSPICE manual, the .OP statement can be used to =
produce an operating point during a transient analysis. Only one .OP =
statement can appear in an HSPICE simulation. =20
General form:
.OP<format><time><format><time>
format=3DALL,BRIEF,CURRENT,DEBUG,NONE,VOLTAGE
ALL=3Dfull operating point
BRIEF=3Done line summary of each element's voltage, current and power in =
mW
CURRENT=3Dvoltage table with element currents and power
DEBUG=3Dprints nonconvergent nodes with the new voltage, old voltage and =
the tolerance; also the nonconvergent elements with their tolerance =
values
VOLTAGE=3Dvoltage table only
time=3Dtime at which the report is printed
The book then give the following example:
.OP .5NS CUR 10NS VOL 17.5NS 20NS=20
They have used abbreviations for the <format> parameter that were not =
mentioned in the above definitions, but I assume they work. the 1st =
format definition is left out, and should default to ALL. =20
Again, this is from 1996 so it may have changed slightly, but I know it =
still works in at least a very similar format if the exact one above =
does not. I will leave the debug if any to you. =20
Steve
-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]
Sent: Monday, January 20, 2003 10:09 AM
To: si-list@xxxxxxxxxxxxx; SKWONG@xxxxxxxxxx
Subject: [SI-LIST] Re: Combining DC and TRANS analysis
> Is there a way to combine DC (.dc) and transient (.trans) analysis in
> HSPICE?
>=20
> For example, is it possible to perform DC analysis only after 500ns?
> If it
> is, how do we go about it?
=20
Exactly what are you trying to find?
In SPICE, DC analysis assumes everything is quiescent forever. Why
would you need to wait 500ns? Do you have input signals that are
changing in the first 500ns? Or did you find that a transient analysis
with no inputs changing, results in the operating point shifting over
time?
I think the short answer to your inquiry is "no," but it begs further
questions about what you want to do. Of course you can combine a .DC
and a .TRAN analysis in the same simulation, but SPICE does the .DC
first, then goes on to the .TRAN portion.
Regards,
Andy
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