[SI-LIST] Re: Issues with Midpoint Crossing of DifferentialIBIS Buffer
- From: "Timothy Coyle" <Timothy.Coyle@xxxxxxx>
- To: Adam.Tambone <Adam.Tambone@xxxxxxxxxxxxxxxxx>
- Date: Wed, 31 Jul 2002 14:07:27 -0400
Hi Adam,
Thanks for the tip, but I was already aware of that.
Regards,
Tim
Adam.Tambone@xxxxxxxxxxxxxxxxx
07/31/2002 01:40 PM
To: Timothy Coyle/Americas/NSC@NSC
cc: si-list@xxxxxxxxxxxxx@Internet
Subject: Re: [SI-LIST] Issues with Midpoint Crossing of
Differential IBIS Buffer
Hello Tim,
Here is a small tip that you might not have tried yet. The 'ramp' keyword
associated with B-Elements in HSPICE specifies what V-t data to use.
ramp=0 uses ramp data, ramp=1 uses the first set of V-t data for rising
and
falling waveforms, and ramp=2 uses two sets each of V-t data for rising
and
falling waveforms. Perhaps this will help.
Rgds,
Adam
|---------+---------------------------->
| | "Timothy Coyle" |
| | <Timothy.Coyle@ns|
| | c.com> |
| | Sent by: |
| | si-list-bounce@fr|
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| | |
| | 07/31/02 10:02 AM|
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| | Timothy.Coyle |
| | |
|---------+---------------------------->
>-------------------------------------------------------------------------------------------------------------------------------|
| |
| To: si-list@xxxxxxxxxxxxx |
| cc: |
| Subject: [SI-LIST] Issues with Midpoint Crossing of
Differential IBIS Buffer |
>-------------------------------------------------------------------------------------------------------------------------------|
Hi,
I am having issues with a differential IBIS buffer. When I run the file in
XTK, it works fine. When I run the file in HSPICE, the midpoint crossing
is not correct. The transition
rate and waveshape of an individual driver are good, but the midpoint
crossing is towards Vcc. I checked the V-T data to see if the
rising/falling data crossed at the
midpoint, and it does. I'm wondering if this is a problem with the I-V or
V-T data, or both? Or is this a simulator issue? Instead of using a
differential load resistor, I tied
the outputs to a load resistor to a reference voltage (Vos), and then the
midpoint crossing was accurate.
Any suggestions/comments?
Regards,
Tim
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