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Nexxim Simulator >
   Nexxim Simulation Process >
       Nexxim Options >
           Options in the Netlist

Options in the Netlist

In a netlist, both device and analysis-specific options are set with the .OPTIONS statement. The syntax is:

.OPTIONS [qualifier.]option[=val][ [analysis.]option[=val] ...]

The .OPTIONS statement can contain multiple option settings, separated by spaces.

Options can be made specific to a particular analysis by prefixing the analysis type to the option, with a period as a separator. The prefix is one of:

dc for DC analysis

tran for transient analysis

hb for harmonic balance analysis

hb.env for harmonic balance envelope analysis

lna for linear network analysis

osc for oscillator analysis

osc.phase_noise for oscillator phase noise analysis

tv_noise for time-varying noise analysis

eye for VerifEye and QuickEye analyses

ami for Algorithmic Modeling Interface (AMI) analysis

s_element for S-element calculations

w_element for W-element calculations

An analysis-specific option setting takes precedence over a non-specific setting of the same option, for the given analysis. For example, during a harmonic balance analysis, the option setting:

hb.abstol=4e-12

takes precedence over a setting of abstol=2e-12 set elsewhere in the netlist. When you set an option with the Add Solution Options selection from the Circuit pulldown, or from within the individual Solution Setup dialogs, Designer automatically puts the correct prefix on the option in the netlist.

Refer to the help topics on the individual analyses for examples and discussions of the analysis-specific options.

Some options are flags that do not have a value. They are enabled when they are present in the .OPTIONS statement and disabled otherwise. An example is WL, which reverses the order of the width and length model parameters in a MOSFET instance or element statement. Other options take a value, in which case the statement adds an equals sign after the name of the option.

When the same option has been set both inside and outside of the netlist, the following precedence is applied:

Command line options > netlist options > default (configuration file) options.

Within a netlist, options on the .OPTIONS statement can be overridden by model and instance parameters. The order of precedence is: instance parameter > model parameter > option.

If the netlist contains multiple .OPTIONS statements that set the same option, the last setting overrides any earlier settings.

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