[SI-LIST] Re: Temperature vs. performance in different type of processes.
- From: "Dagostino, Tom" <tom_dagostino@xxxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 11 Jul 2001 09:37:26 -0700
CMOS devices get faster and stronger at temperature goes down and voltage goes
up. Bipolar devices get faster and stronger as voltage and temperature go up.
Worst case for IBIS, MAX, is the corner where the part is fastest and has the
lowest output impedance. Likewise for CMOS low volts and hot temp make the
part slow/weak and for bipolar low volts and low temp are at the slow/weaker
corner. For IBIS, slow/weak is the min corner case. This all goes out the
window if there is temperature compensation done in the circuits, but as a rule
this applies.
Tom Dagostino
Modeling Manager
Mentor Graphics Corp.
SAE
tom_dagostino@xxxxxxxxxx
503-685-1613
-----Original Message-----
From: John@xxxxxxxxxxxx [mailto:John@xxxxxxxxxxxx]
Sent: Wednesday, July 11, 2001 3:56 AM
To: si-list@xxxxxxxxxxxxx
Cc: John Lin (???)
Subject: [SI-LIST] Temperature vs. performance in different type of processes.
Dear SI gurus,
Recently, I read an article regarding IBIS model generation. In this
article, it says for pure CMOS design if specified at 3.3V (nominal),
the maximum conditions will be VCC=3.6V and temperature = -40C,
the minimum conditions will be VCC=3.0V and temperature = 85C.
Bipolar design if specified at 5V (nominal),
the maximum conditions will be VCC=5.5V and temperature = 85C (not -40C in
above case)
the minimum conditions will be VCC=4.5V and temperature = -40C (not 85C in
above case)
"CMOS,Bipolar and BI-CMOS processes each have unique characteristics that
determine these
performance conditions." said in the article.
Can somebody shed some light on it? Why do they have different temperature
defined for maximum and minimum conditions? What is for BI-CMOS?
Thank you for your comments in advance. >8-)
John Lin
Senior SI Engineer, Server Team, ARD4
Quanta Computer Inc.,Taiwan, R.O.C.
Email: John@xxxxxxxxxxxx
Tel: 886+3+3272345 ext. 5183
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