SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Politics : Formerly About Advanced Micro Devices
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Petz who wrote (82631)12/10/1999 9:47:00 PM
From: Bill Jackson  Read Replies (1) of 1572777
 
Petz, From what the young boy said there seems to be luttle variation across the wafer. I now wonder if they intentionally start to make 500 Mhz parts and could also make 750 Mhz parts at will. Earlier i had thought that they got a scatter and tested and marked. But at 4% variation a 700 Mhz wafer will make all parts within +/- 28 Mhz of 700?
I also wonder how they etch those thin point? Do they implant some sodium at an earlier stage in deposition, laying down a thin layer with a few extra sodium atoms in the mix? ( just a few) since it is well known that sodium in glass makes it dissolve faster in an alkaline etch bath? Probably those sodium atoms would make the SiO2 act funny, unless they deposited it only on the surface in the trenches where they wanted the extra etching by shadow mask type deposition? so it went away at the end. Does anyone know just how they do it within the process methodology?

Bill
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News