[SI-LIST] Re: IBIS file data
- From: "Lynne Green" <lgreen22@xxxxxxxxxxxxxx>
- To: <paycheehow@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 Jul 2004 13:40:37 -0700
Hello, Pay Chee,
1) This is done the same way whether done by measurement or by simulation.
With I/O in Input mode, measure "clamp" currents. With I/O in Output mode,
measure total current, once with Data=1 and once with Data=0. Pullup and
Pulldown are created by subtracting the Input current from the Total
current. Power and GND clamp currents are typically separated by assigning
all current for V<0 to the GND Clamp and for V>0 to the Power Clamp.
2) Linear extrapolation is one way to get the endpoints of the table.
Some of this is discussed in the IBIS Cookbook.
http://www.eda.org/pub/ibis/wip/ckbkwfw3.doc
- Lynne
"IBIS training when you need it, where you need it."
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@xxxxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Pay Chee How
Sent: Thursday, July 15, 2004 12:29 PM
To: si-list@xxxxxxxxxxxxx
Cc: Michael.Phoon@xxxxxxxxxxxxx
Subject: [SI-LIST] IBIS file data
Hi,
I need some advices on the following questions
1. In an IBIS file, at a particular voltage there are 'typical' current,
'maximum' current and 'minimum'
current. If I am collecting the data by physical measurement, how do i
obtain the max and min
current?
2. If a curve tracer is unable to give me the full range of voltage sweep
that i want(for instance from
+Vcc to 2Vcc) how can I extrapolate the curve or obtain the missing
data?
Thanks....
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