Quantifying losses of Process Variation

Posted by Tod Peterson on June 29, 1999 at 05:09:03:

A few years back, I found myself trying to defend some of the economic benefits of advanced control. My protagonists use an argument something like this:

"If we experience a disturbance that brings the product either side of the operational target, we just compensate by operating on the opposite side of the disturbance for awhile. If the impurity spikes high, then we just operate with less impurity for some time and it all balances out. Anyway, the product we sell is blended to target, so there is not really any product loss."

I developed a formula and technique to prove (and quantify) that there is, in fact, an irreversible loss that cannot recovered by compensation or blending. Once I figure out how to convert and post a PDF file, I'll be able to give a more thorough description of the technique. In the meantime, let me know if there is any interest in this type of information.

Tod

Follow Ups:

• Here is the Paper! Tod Peterson 01:58:21 8/25/99 (0)
• Re: Quantifying losses of Process Variation Don Snowden 14:38:58 7/12/99 (3)
  • Re: Quantifying losses of Process Variation Jim Gunderman 23:55:16 7/15/99 (2)
    • Re: Quantifying losses of Process Variation Krishnan Viswanath 23:28:03 7/19/99 (1)
      • Re: Quantifying losses of Process Variation Tod Peterson 02:02:52 8/25/99 (0)

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: A few years back, I found myself trying to defend some of the economic benefits of advanced control.  My protagonists use an argument something like this:

: "If we experience a disturbance that brings the product either side of the operational target, we just compensate by operating on the opposite side of the disturbance for awhile.   If the impurity spikes high, then we just operate with less impurity for some time and it all balances out.  Anyway, the product we sell is blended to target, so there is not really any product loss."

: I developed a formula and technique to prove (and quantify) that there is, in fact, an irreversible loss that cannot recovered by compensation or blending.  Once I figure out how to convert and post a PDF file, I'll be able to give a more thorough description of the technique.   In the meantime, let me know if there is any interest in this type of information.

: Tod


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