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Politics : Formerly About Advanced Micro Devices
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To: Aaron Cooperband who wrote (51134)2/26/1999 7:07:00 PM
From: Elmer  Read Replies (1) of 1571926
 
Re: "So, for example, on a 25 micron process its OK to put any voltage through the circuits? I have to believe there is some limit thats prudent for a given line size. This can be the constant that allows a comparison."

I believe Yousef addressed this point. Elevated voltage accross the gate risks 2 things. #1 Actual breakdown of the gate oxide, unlikely here but more likely that if it were run at 2.2v.

#2. A upward shift in vt's due to hot carrier injection which will degrade performance over time making in effect, a 450Mhz device into a 433Mhz device or some other such degradation after weeks or months of operation. What Yousef might have add is that this can be compensated for at test where for example a 450Mhz part must run at 475Mhz to be acceptable, considering the HCI affects that will take place with time. This is considered an act of desperation in the industry. But if you have no other choice you do what you have to do to stay alive.

EP
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