[IBIS] RE: [IBIS-Users] sweep range extrapolation problem

SPICE clamp/ESD diodes are usually well-behaved over the full range if the
diode series resistance is modeled (RS _NOT_ 0.0 Ohms).

- Lynne

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Guoli Wang
Sent: Wednesday, May 19, 2004 9:56 AM
Cc: ibis@eda.org; ibis-users
Subject: [IBIS-Users] sweep range extrapolation problem

Hi All,

The sweeping range (-vcc~2vcc) is so big that the spice model is not
well behaved over the range when the ESD diodes are forward biased. I
read from the IBIS cookbook that we can do linear extraction from the
range that spice model can handle up to the whole range. Is there any
special rule or tool for the "linear extraction"? How critical is it
of the extrapolation to be accurate? Is it preferred to measure in
real silicon device to get those data?

Thanks for any help.

Guoli

|------------------------------------------------------------------
|For help or to subscribe/unsubscribe, email majordomo@eda.org
|with just the appropriate command message(s) in the body:
|
| help
| subscribe ibis <optional e-mail address, if different>
| subscribe ibis-users <optional e-mail address, if different>
| unsubscribe ibis <optional e-mail address, if different>
| unsubscribe ibis-users <optional e-mail address, if different>
|
|or email a written request to ibis-request@eda.org.
|
|IBIS reflector archives exist under:
|
| http://www.eda.org/pub/ibis/email_archive/ Recent
| http://www.eda.org/pub/ibis/users_archive/ Recent
| http://www.eda.org/pub/ibis/email/ E-mail since 1993

-----------------------------------------------------------------
|For help or to subscribe/unsubscribe, email majordomo@eda.org
|with the appropriate command message(s) in the body:
|
| help
| subscribe ibis <optional e-mail address, if different>
| subscribe ibis-users <optional e-mail address, if different>
| unsubscribe ibis <optional e-mail address, if different>
| unsubscribe ibis-users <optional e-mail address, if different>
|
|or email a request to ibis-request@eda.org.
|
|IBIS reflector archives exist under:
|
| http://www.eda.org/pub/ibis/email_archive/ Recent
| http://www.eda.org/pub/ibis/users_archive/ Recent
| http://www.eda.org/pub/ibis/email/ E-mail since 1993
Received on Wed May 19 11:19:49 2004