[SI-LIST] Re: IBIS basic question
- From: "lgreen" <lgreen22@xxxxxxxxxxxxxx>
- To: <JIWU@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 2 Dec 2004 09:43:08 -0800
Hello, Jing,
The IBIS Quality Checklist recommends that both clamp tables cover the full
range of -Vcc to 2*Vcc (since different tools could extrapolate
differently). Normally, the clamp current is 0A above 0V in both clamp
tables. However, active clamping (on-die pullup/down "resistors") could have
non-zero current in this range.
Since SI simulators sum currents, it is important to make sure currents are
never double-counted.
The IBIS summing is:
I_up = [Pullup] + [GND Clamp] + [PowerClamp]
I_dn = [Pulldown] + [GND Clamp] + [PowerClamp]
I_in = [GND Clamp] + [PowerClamp]
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 Jing Wu
Sent: Wednesday, December 01, 2004 4:59 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] IBIS basic question
Hi, ibis experts:
For the GND clamp I-V curve, normally the data is taken from -Vcc
to Vcc while for the power clamp I-V curve, the data is taken from Vcc
to 2Vcc. How about if both the GND clamp and Power Clamp curve have the
data from - Vcc to 2Vcc, will the simulator double-count the data or
different simulator have different solutions? =20
Thanks,
jing
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