Extraction Tech

These are mostly in support of the extraction system, but the variables and keywords are handled by the main program, so can be set or read if the extraction system is not available.

AntennaTotal
Value: real number.
This variable applies to the !antenna command. The value is a threshold total-net antenna ratio, as explained for the !antenna command. The value is effectively passed to that command as a default.

The Global Attributes button in the Tech Parameter Editor provides a prompt-line interface for setting this variable.

Db3ZoidLimit
Value: integer 1000 or larger.
This limits the amount of geometry which can be saved in the 3-D geometry database, which is used in the Cross Section command, and in the interfaces to external capacitance and inductance extraction programs. The total trapezoid element count is limited to 10000 by default, i.e., when this variable is not set. The database is not designed for large collections, and the limit avoids embarking on long computations where the program becomes unresponsive.

LayerReorderMode
Value: integer 0-2.
This sets the default sequencing assumption used in the three-dimensional layer sequence generator (see 12.8), which is used for the cross-section display and the capacitance extraction interface. This can be set to an integer in the range 0-2. The value 0 is the default, the same as if the variable is not set. The other values will internally resequence Via layers, as described for the layer sequence generator.

The Global Attributes button in the Tech Parameter Editor provides a prompt-line interface for setting this variable.

NoPlanarize
Value: boolean.
If set, by default no layers are planarizing, as explained in the description of the three-dimensional layer geometry database in 12.8. Otherwise, the default is that layers with the Conductor keyword given, explicitly or implicitly, or the Via keyword given, will be planarizing by default. The Routing, GroundPlane, GroundPlaneClear, Contact and their aliases implicitly set the Conductor keyword. Thus, by default the metal stack is planarized, as in a contemporary semiconductor process.

The Global Attributes button in the Tech Parameter Editor provides a prompt-line interface for setting this variable.

SubstrateEps
Value: real number.
This variable sets the relative dielectric constant assumed for the substrate, used by the capacitance extraction interface. If not set, the default is 11.9.

The Global Attributes button in the Tech Parameter Editor provides a prompt-line interface for setting this variable.

SubstrateThickness
Value: real number.
This variable sets the thickness of the substrate assumed by the program, as a real number in microns. This is used only by the capacitance extraction interface. If not set, a thickness of 75.0 microns will be assumed.

The Global Attributes button in the Tech Parameter Editor provides a prompt-line interface for setting this variable.