[SI-LIST] Issues with Midpoint Crossing of Differential IBIS Buffer
- From: "Timothy Coyle" <Timothy.Coyle@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 31 Jul 2002 10:02:37 -0400
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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