[SI-LIST] Re: negative mos conductance
- From: Raymond.Leung@xxxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 12 Oct 2004 13:38:46 +1000
I would like to add one more input: if you are simulating a
schematic in which node capacitances are unreal, perhaps
the CSHUNT parameter can help. Many times when
negative condutance warning goes together with time step
too small problem, there is an unrealistic model parameter
set, if the node capacitances are well considered.
Regards,
Raymond
"lgreen" <lgreen22@xxxxxxxxxxxxxx> on 12/10/2004 10:23:21
Please respond to lgreen22@xxxxxxxxxxxxxx
To: silverhawk2040@xxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
cc: (bcc: Raymond Leung/sdc)
Subject: [SI-LIST] Re: negative mos conductance
Hello, Manish,
1) This is a convergence problem. You might want to investigate your
settings for GMIN and the various tolerance controls (VTOL, RELTOL, =
etc.).
2) One might also want to investigate the model parameters. Sometimes
transistor "models" (i.e. parameter sets) are non-physical. This can be
caused, for example, by quirks in solving the N-dimensional parameter
extraction problem with correlated parameters.
Best regards,
Lynne
"IBIS training when you need it, where you need it."
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
lgreen22@xxxxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of manish bhakuni
Sent: Thursday, October 07, 2004 9:01 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] negative mos conductance
=A0
hello ppl out there
im trapped in simulation of some circuits in HSPICE.
it gives me negative mos conductance and internal time step too small =
for
transient analysis. plz tell me the reason fot these and there =
solution.
plz also tell me where i can find good tutorials on HSPICE.
yours sincerely
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