On Thu, Mar 5, 2009 at 2:23 AM, al davis ad...@freeelectron.net wrote:
The Gnucap behavior is consistent with Hspice and Spectre.
At least that is what I have been told. I don't have
access to them to check it out.
That's incorrect. Both Spectre and Hspice treat devices with
m1 as
On Friday 06 March 2009, r wrote:
ok maybe you can help solve this.
Well, I'm not sure. I don't know how it is implemented in
these simulators. I guess these guys have simply modified the
models (they have modified quite a few other things there so
I guess they wouldn't have minded
r wrote:
BTW, some simulators preprocess the netlist and reduce parallel
devices into a single device with an m parameter set. This gives a
huge performance boost in extracted sims.
I'm curious as to which simulators and if they are smart enough to get
the reduction right all the time.
-Dan
On Wed, Mar 4, 2009 at 7:07 AM, al davis ad...@freeelectron.net wrote:
like it, for example, I put m=50 to report the full current
instead of 1/50 of the current going into it.
The Gnucap behavior is consistent with Hspice and Spectre. At
least that is what I have been told. I don't have
On Wednesday 04 March 2009, r wrote:
On Wed, Mar 4, 2009 at 7:07 AM, al davis
ad...@freeelectron.net wrote:
like it, for example, I put m=50 to report the full
current instead of 1/50 of the current going into it.
The Gnucap behavior is consistent with Hspice and Spectre.
At least
al davis wrote:
The Gnucap behavior is consistent with Hspice and Spectre. At
least that is what I have been told. I don't have access to
them to check it out.
The behavior is an artifact of the implementation. In
Gnucap, m works for all devices, including plugin models and
On Wednesday 04 March 2009, John P. Doty wrote:
I hope you haven't implemented the ngspice brain damage that
causes it to apply the m= multiplier repeatedly for each
successive analysis (your transistors grow as you proceed).
Only when you use NGspice models as plugins. :-)
Seriously I
Quick questions:
Why doesn't the .global statement work in gnucap? Do you have to add
flags to compile it with that option similar to ngspice? If so how?
Another question is when you probe current of transitors with multiple
legs, it splits up the current instead of giving you
On Tuesday 03 March 2009, Yamazaki R2 wrote:
Why doesn't the .global statement work in gnucap?
There hasn't been much demand for it. In other simulators that
have it, it often leads to surprise results.
Do you have
to add flags to compile it with that option similar to
ngspice? If so how?
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