Layout Customization Options
When you run a simulation, the Electromagnetic Solver assistant saves the model information in a .clf file and sends it to the simulator. During this process, the tool might also run layout customization required for simulation.
You can set the following variables to influence the layout customization:
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simplifyToSides: Specifies the number of points to be used for the polygon shapes. While creating a .clf file, Virtuoso converts all circle and ellipse shapes found in the IC layout to polygons to avoid any potential loss of information that leads to missing shapes. The default shape of such polygons is hexagon. -
discretizationMaxError: Overrides the error limit automatically derived by the tool. For package layouts, Virtuoso converts curved shapes to polygons before sending the layout details to the EM solver. While doing this conversion, that is discretization, Virtuoso considers the maximum acceptable error limit to identify the number of polygons to be created. A high acceptable error limit, which also means a high error tolerance, results into fewer polygons as compared to a low error tolerance. By default, the tool takes the maximum acceptable error limit from the constraints set for the layout. It then prints the constraint name and the derived error limit in the CIW.
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