Parasitic Layout Extraction =========================== This table list layers and contacts included in SPICE models, and parasitic layers include in the AssuraLayout Extraction. The modeled columns indicate sheets and contacts that are parasitic resistance/capacitance included in the model extraction measurements. The CAD columns indicate sheets and contacts that are parasitics included in the schematic/layout RCX from Assura. .. csv-table:: Parasitic Extraction Table :file: rcx/rcx-all.csv :header-rows: 2 :stub-columns: 1 .. note:: The models includes M1/M2 capacitance. As a result of RCX extraction limitation M1/M2 routing over the varactor will have no capacitance extraction. Routing and placement of devices over or under Precision resistors (xhrpoly_X_X) should be avoided. The parasitic capacitance between 3-terminal MIMC and any routing/devices is not included in layout RCX, except M3 by 1 snap grid width. No artificial fringing capacitance is extracted for MIMC M2/M3 due to CAD algorithm after CAPM sizing. The parasitic capacitance between Precision resistors (xhrpoly_X_X) and any routing/devices is not included in layout RCX. S8Q-5R is not supported for RF ESD diode RCX blocking. The ``areaid:substratecut`` will be extracted as a 0.123 ohm two terms resistor. Resistance Rules ---------------- .. todo:: This table should be rendered like the periphery rules. .. csv-table:: Table of resistance rules :file: rcx/resistance.csv :header-rows: 2 :stub-columns: 1 Capacitance Rules ----------------- .. todo:: This table should be rendered like the periphery rules. .. csv-table:: Table of capacitance rules :file: rcx/capacitance.csv :header-rows: 2 :stub-columns: 1 Discrepencies ------------- Non-precision poly resistors These resistors do not extract capacitance to substrate. This needs to be accounted for manually by using ICPS_0150_0210 (cap per perimeter), and ICPS_2000_4000 (cap per area). Un-shielded VPP's Any routing above an un-shielded VPP will not be extracted. The impact of this on total capacitance and parasitic capacitance is already comprehended in the model corners, however, cross-talk is not modeled. Also, parasitic cap is routed to ground and this may not be ideal for the scenario. The parasitic cap can be estimated using RescapWeb.