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A "control" cell in an experiment is a cell for which the physical properties are known. Control cells are used when you want to evaluate the effect of a new fabrication process or technique, but you also want to be sure that the results are not contaminated by some unaccounted for variable.

For example, in the manufacture of integrated circuits, you may wish to evaluate the change in circuit performance when you shift the voltage threshold of your transistors. You would fabricate a control cell using the normal process, and an experimental cell using the new voltage threshold process. The circuits would be fabricated together on the same equipment, using the same processes, except for the one step where the voltage thresholds vary. That way, when you see a performance difference between the control and experimental cells, you can be assured that the difference is due to the voltage threshold difference, and not some other process.

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15y ago

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