[SI-LIST] Re: Combining DC and TRANS analysis
- From: Shee Kian Wong <SKWONG@xxxxxxxxxx>
- To: "'Ingraham, Andrew'" <Andrew.Ingraham@xxxxxx>,si-list@xxxxxxxxxxxxx, Shee Kian Wong <SKWONG@xxxxxxxxxx>
- Date: Mon, 20 Jan 2003 15:53:00 -0800
Hi Andy,
Thanks for the interest and reply.
In fact, I have a circuit which needs about 500ns to settle down and produce
steady output. I can only do any DC analysis on it after 500ns to get more
accurate results.
Do you think we can do this?
Regards,
SK
-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]
Sent: Tuesday, January 21, 2003 2:09 AM
To: si-list@xxxxxxxxxxxxx; SKWONG@xxxxxxxxxx
Subject: RE: [SI-LIST] Combining DC and TRANS analysis
> Is there a way to combine DC (.dc) and transient (.trans) analysis in
> HSPICE?
>
> For example, is it possible to perform DC analysis only after 500ns? If it
> is, how do we go about it?
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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