Requests that absolute sensitivities be calculated for specified circuit elements with respect to the first requested output variable. The '.' before SENSA must be in the first column of the record. The elements for which the absolute sensitivity will be calculated are listed on the .SENSA record. Absolute sensitivity can be calculated for the following element types: G, R, L, C, IOA, VCC, CCC, VVC, CVC, and MUL. The sensitivity reported for R elements will be that for the corresponding G element. The sensitivity to the R value is obtained by multiplying the reported sensitivity value by -1.0.
Sensitivities are calculated as part of an .AC or .VARY analysis. An .AC or .VARY analysis (see .AC ad .VARY record descriptions) must be requested for a .SENSA analysis to be performed. Sensitivities are calculated at the frequencies requested in the .AC or .VARY analysis request.
Absolute sensitivities are defined as:
dO(jw)/dh
where O(jw) is the first requested output variable for the analysis and h is the specified network element.
All sensitivities calculated are presented in real and imaginary form. The sensitivity format is independent of the format requested for the .AC analysis.
Note that only a single .SENSA or a single .SENSR request can be made for any one analysis.
Example:
.SENSA c1, r23, g4, c2, rx