RE: [SPAM] Re: [IBIS-Users] difference in time period across corners

Thanks Mike. Once I fixed the long tails the simulations came out as
expected.

Thanks once again

Anand

From: Mike LaBonte [mailto:milabont@cisco.com]
Sent: Tuesday, July 26, 2011 7:29 PM
To: Anand Ramalingam; IBIS
Subject: [SPAM] Re: [IBIS-Users] difference in time period across
corners
Importance: Low

Which one best matches the stimulus frequency? If it is the max curve
(red), then I would suspect the typ and min V/T curves have very long
"tails" and the simulator is riding them out until they finish, before
responding to the next opposing stimulus edge. Note that when the typ
and min do trigger they have a fixed time relationship to each other and
to the max. I think they are just skipping some edges because they
aren't yet ready.

Mike LaBonte

On 7/26/11 7:25 PM, "Anand Ramalingam" <anandr@Magma-DA.COM> wrote:

Hi ,
 
I am simulating IBIS model using hspice. The problem I have is that the
curves generated by the max corner has a different time period compared
to the ones generated by typ/min curves. The ibis model on visual
inspection seems good (curves follow the expected pattern). The spice
script to run the ibis model just differ in the vdd values. I am not
sure why I see a difference in time period across the corners (min
(green)/typ (yellow) nearly have the same time period while max (red) is
six times faster)
 
 
 

Thanks
Anand

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