[SI-LIST] Re: Basic IBIS I/V curve question
- From: "Ingraham, Andrew" <Andrew.Ingraham@xxxxxx>
- To: "Gustavo Blando" <gblando@xxxxxxxxxxxx>
- Date: Thu, 7 Nov 2002 11:54:49 -0500
> I am confused here. I though that even though the curves are VCC
> relative on
> IBIS
> it does matter the voltage at which the VI curves where extracted.
Yes it does.
I wrote that the curves and supply voltage are independent, "ideally."
In reality, the drive strength of real devices, as measured in a
Vcc-relative way, does depend on the supply voltage.
But IBIS is not detailed enough to show that dependency. So when you
use a model, you could use the minimum curve with something other than
the minimum supply voltage. The results ought to be conservative,
because the real device would be slightly stronger/faster, at that
supply voltage, than that dictated by the minimum I-V curve that the
simulator uses.
Some simulators (such as Hspice) let you choose the supply voltage
separately from the I-V curve. Others may make them linked so that you
can't do that.
Regards,
Andy
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
