[IBIS-Users] RE: How to handle > 50% correlation

Estella,

It sounds like you are taking the pull-up and pull-down data for your IBIS model half way through the cycle. When you compare the hspice (IBIS model) to the spice deck you will see this error. I think that you IBIS model rise and fall times are incorrect.

Best Regards,
 
Bonnie Baker

-----Original Message-----
From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Silva, Estella
Sent: Wednesday, February 16, 2011 12:46 PM
To: ibis@eda.org; ibis-users@eda.org
Subject: [IBIS] How to handle > 50% correlation

Hello,

I created an IBIS model of a GPIO cell and correlated the simulation results between using the IBIS model (HSPICE simulation) with the transistor level (spectre simulation).

I used two methods in obtaining the IV and VT curves.

However, the correlation results are 50% off for the risetimes & falltimes for both cases.

Can anyone please advise on what to do in this case?

Thanks & best regards,
Estella

National Semiconductor
(408) 721-7678

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