[SI-LIST] Re: Determining load line for LVDS IBIS Device
- From: "Beal, Weston" <weston_beal@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 25 Oct 2002 09:41:16 -0700
Tim,
What are the first and last points of your rising and falling waveforms? These
are the numbers that need to match the intersections on your load line graphs.
Regards,
Weston
-----Original Message-----
From: Timothy Coyle [mailto:Timothy.Coyle@xxxxxxx]
Sent: Friday, October 25, 2002 8:55 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Determining load line for LVDS IBIS Device
Hi,
I have an LVDS IBIS file that I am trying to calculate a load line on. The
LVDS outputs switch from 1.0 to 1.4 Volts, with a single-ended load of 50
ohms to 1.2V.
I plotted my pullup and pulldown curves together. My pullup curve crosses
zero current at about 1.4 V, and my pulldown curve crosses zero at about
1.0V. I draw a line
from my pullup curve at 1.4V, through my pulldown curve, to 24 mA. (based
on 50 Ohms to 1.2V) The intersection is 1.1V. When I do the same for my
pulldown
curve, starting at 1.0V, going through my pullup curve, to -24 mA, I get
1.13 V. I should get endpoints of 1.0V and 1.4V. This IBIS file parsers
with no warnings and simulates
fine in an IBIS simulator. I attached an image of my load line curves. (I
don't know if it can go through this list though?)
Can someone tell me what I'm doing wrong here?
Thanks,
Tim
(See attached file: load line.jpg)
-- Binary/unsupported file stripped by Ecartis --
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-- File: load line.jpg
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