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To: ArGee
They quit inviting me to meetings when I improved the process enough to start reporting yields over 100% of standard.

Standard yield for wafer fab was defined as 80% of the wafers started made it to the end of the line.

Standard yield for electrical test was defined as 80% of the die on those wafers met electrical test requirements.

Standard yield for pressure test was defined as 80% of the electrically good die met sensitivity requirements.

0.8 x 0.8 x 0.8 ≈ 50% actual yield. They were happy with 80% of that when I started.

They were NOT happy with me explaining that to upper management...

3,816 posted on 04/09/2013 11:21:30 AM PDT by null and void (Gun confiscation enables tyranny. Republicans create the tools of oppression and Democrats use them.)
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To: null and void

Traditional management techniques always lead to information hiding, which is exactly what managers don’t want.

Why do they keep putting up with it?


3,817 posted on 04/09/2013 11:37:03 AM PDT by ArGee (I wanted to be alone with my thoughts, but they stood me up.)
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To: null and void
improved the process enough to start reporting yields over 100% of standard.

Umm... Isn't Global Foundries looking for increased yields (or was that when they were still AMD)...??? ;-)

But then you'd need to move to either Silicon Valley in the land of Fruits and Nuts, or Dresden... You like German Bier, ja?

3,818 posted on 04/09/2013 11:41:18 AM PDT by NoCmpromiz (John 14:6 is a non-pluralistic comment.)
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To: null and void

That’s a pretty crappy wafer yield in today’s fab. They get upset if it’s <95% electrical (no sensors) where I worked, back when I was in manufacturing. I was thrilled when I landed the job at R&D. Now it’s, “Huh? What is this ‘yield’ of which you speak?”


3,834 posted on 04/09/2013 1:17:26 PM PDT by Cyber Liberty (I am a dissident. Will you join me? My name is John....)
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