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Design Notes

Manufacturing View using the SPP Modifier

This project shows how to use the Shape Pre-Processor (SPP) modifier to aggregate multiple shape modifiers into one modifier.  Often times layer modifiers are used to slightly modify the geometry of an RF circuit geometry for when it’s sent to manufacturing.  One common case is rounding corners for high power devices.  This has little electrical effect and can add complexity to circuit creation/simulation, but the current crowding can cause reliability issues and must be addressed.  This issue can be addressed after simulation by modifying the production geometry with layer modifiers.  The most efficient approach with multiple layers is to aggregate them using the SPP modifier.



This project uses a simple inductor to illustrate the concept of a manufacturing view that is modified from the originally simulated geometry.  The SPP modifier in the Inductor schematic rounds the corners of all the layers of the plated inductor using a single SPP modifier. 

The Manufacturing_View schematic shows the inductor with the rounded corners.  The Manufacturing_View, or any top level, schematic is necessary to inspect the changes of the SPP modifier.  The SPP modifier does not change layout in the schematic it is placed; it must be instantiated in hierarchy.  However, if you export the layout where the SPP modifier exists, the modifications will be present.

The SPP modifier is easier to use with multiple layers, rather than having an individual modifier for each layer, and is also more computationally efficient than using many modifiers.