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PROCESS CONTROL USING SIGNAL REPRESENTATIVE OF A THROTTLE VALVE POSITION

  • US 20110168671A1
  • Filed: 01/08/2010
  • Published: 07/14/2011
  • Est. Priority Date: 01/08/2010
  • Status: Abandoned Application
First Claim
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1. A method, comprising:

  • a) conducting at least a step in a fabrication process in a processing chamber by varying a position of a throttle valve with time to thereby maintain a desired pressure within the chamber;

    b) generating a signal representative of the position of the throttle valve; and

    c) determining when the step in the fabrication process has reached an end point by detecting a change in the signal.

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