In IC6, device matching constraints are stored as constraint views of a cell. While it works OK with schematic pre-layout monte-carlo simulation, where the constraint views are effective clearly. However, when replacing the cells with PEX extracted views, the same monte-carlo simulation gives different results of matching performance. I think it is because that the constraint views are not connected to the extracted view netlist (instance name change). I wonder if there is a formal method to preserve the constrained instance paths to be exactly the same before and after layout? I realized in IC5, the same issue should exist. FYI, I am using Calibre PEX. Thanks.
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