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Currently the calculation of the critical area for GOS faults in Carafe does not take into account the geometry of the transistor. For example, in Figure 4.16 Carafe would find two GOS faults, A and B, and give both faults equal critical area. This is not correct since fault A should have a higher critical area because the diffusion and the polysilicon share a longer perimeter.

Figure 4.16: Limitations for the calculation of critical area for GOS faults

David Dahle Wed Jan 24 11:51:06 PST 1996