Andrew Beckett
Senior Fellow
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Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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OK, from that I would understand that perimeter_inside(D,diff) would be the part of the perimeter of D (the Drain) which is strictly inside the diffusion. Since the diffusion will be the complete region of the transistor, and the Drain outer edge will be coincident with the diffusion edge, it will be the perimeter of the Drain area along the poly gate, most likely. This should in effect be the width of the transistor.
You didn't show the W line from your rule deck (only the example from the manual), but I would imagine it's more closely defined to the dimensions of the poly gate. Either way, I'd expect W and perimeter_inside(D,diff) to be the same, so W/perimeter_inside(D,diff) would be 1. I imagine this calculation is being done to cope with some unusual transistor geometries, perhaps? Perhaps sometimes the width measured one way is not the same as this perimeter_inside?
Best Regards,
Andrew.
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