Every software package contains a full set of examples suitable for that version and are installed with the software. If you see examples here that are not in your installation you should consider updating to a later version of the software. These examples can be used by beginners and advanced users for product evaluation, teaching purposes, and self-training.
Required Modules
Victory Process
- 3D Structure Editor
Victory RCx
This example is a six-transistor, three metal, single poly SRAM cell. The cell consists of four NMOS and two PMOS transistors.
The layout file defines various layers up to metal 3. The rule file exports six new masks, plus VictoryRCx defines another two masks – *GATE and *CONT. These masks are gates and contacts, which are the NGATE and PGATE regions, plus the two exported contacts. The modified layout and a SPICE netlist of the devices are saved after the original layout file is initialized in the command file and the rule file executed in the command file.
The gate oxide is defined as a separate material, called gateox, distinct from silicon oxide. gateox is given a very low (but non-zero) permittivity. As a result, the area calculation of capacitance (i.e. determined by the transistor gate area over the gate oxide and silicon) is very low. This area capacitance of the gate over silicon is accurately calculated in the SPICE model (since only the area and gate oxide thickness are necessary). Since VictoryRCx calculates the total field solution, it does not distinguish the contribution of the capacitance due to the poly gate over the silicon from either the fringe effects or capacitance with other conducting lines. This methodology of artificially lowering the area capacitance in VictoryRCx avoids calculating this value twice, once in VictoryRCx, and once again in the SPICE model.
The geometry of the structure is the idealized Manhattan cross-sections. No advanced lithographic or etch models are used.
This example is also discussed in the VictoryRCx tutorial in the manual.
Images
