I see this frequently in the ICs we measure for IBIS models. We have seen the
slow corner faster than the fast. I think we have even seen the slow corner
stronger than the fast.
But when done properly the three corners for all practical purposes overlay
very nicely. Some companies have very good design teams.
Tom Dagostino
971-279-5325
tom@xxxxxxxxxxxxxxxxx
Teraspeed Labs
9999 SW Wilshire Street
Suite 102
Portland, OR 97225
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Vinu Arumugham (Redacted sender "vinua" for DMARC)
Sent: Tuesday, December 03, 2019 10:24 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: [EXTERNAL] Re: Overshoot/undershoot is higher in Slow
corner than fast corner
Venkat,
If this buffer is PVT compensated, this can happen. The basic idea is to
speed up the slow corner and slow down the fast corner to give you more
or less uniform impedance over the PVT spectrum. So the result can be
slow corner performing faster than the fast corner due to a bit of
overcompensation.
Thanks,
Vinu
On 12/3/19 10:00 AM, Cotton, Chris wrote:
My first thought was impedance as well. But you could also try checking your------------------------------------------------------------------
package RLGC assumptions for the slow corner. Perhaps inductance assumption
is too high??
Chris
From: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> On Behalf
Of Venkat S
Sent: Tuesday, December 3, 2019 9:40 AM
To: Taddonio, Paul <Paul.Taddonio@xxxxxxxxxxx>
Cc: si-list@xxxxxxxxxxxxx
Subject: [EXTERNAL] [SI-LIST] Re: Overshoot/undershoot is higher in Slow
corner than fast corner
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Thanks Paul,
Output impedance is close to fast corner impedance.
Regards
Venkat
On Tue, Dec 3, 2019, 7:46 PM Taddonio, Paul
<Paul.Taddonio@xxxxxxxxxxx<mailto:Paul.Taddonio@xxxxxxxxxxx>>
wrote:
While we might expect a slower rise time at the slow corner, Is there
possibly a greater output impedance mismatch at the slow corner? -Paul
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx<mailto:si-list-bounce@xxxxxxxxxxxxx>
[mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Venkat S
Sent: Tuesday, December 3, 2019 2:28 AM
To: si-list@xxxxxxxxxxxxx<mailto:si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Overshoot/undershoot is higher in Slow corner than fast
corner
Hi SI/PI experts,
I observed a strange behavior in my memory
simulations.In<http://simulations.In> Slow corner we
are seeing higher Overshoot and Undershoot than Fast Corner.
What could be the reason for this ?
It will be great if anyone could provide some ways to figure out this
issue.
Regards,
Venkat
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