The sensitivity of outvar to all non-zero device parameters is calculated when the sensitivity analysis is specified. The parameter outvar is a circuit variable (node voltage or branch current). Without the ac specification, the analysis calculates sensitivity of the dc operating point value of outvar. If an ac sweep specification is included, the analysis calculates sensitivity of the ac values of outvar. The parameters listed for ac sensitivity are the same as in an ac analysis. The output values are in dimensions of change in output per unit change of input (as opposed to percent in output or per percent of input).
The optional dc sweep is a dc analysis specification which will cause the sensitivity analysis to be performed at each point of the dc sweep. The small-signal parameters are reevaluated at every sweep point, and the output vectors will be multidimensional.
In interactive mode, the sens command, which takes the same arguments as the .sens line, can be used to initiate sensitivity analysis.