title: Tool and process improvements from MFC control system technology
abstract: A new approach to MFC calibration links the physical parameters of nitrogen to the physical characteristics of various process gases. This precludes the conventional need for surrogate gases. What results is a physics-based tuning algorithm and enhanced digital control system that enables rearranging and gas change of digital MFCs. The end result should be better process control through more accurate gas flow. The new method also decreases the number of MFC spare parts required to back up a fab
keyphrases: MFC control system technology calibration tuning algorithm digital control process control gas flow process gas surrogate gas semiconductor fab tool technology mass flow controller N/sub 2/