Nonstandard sensitivity analyses in frequency and time domains

The programs of the PSpice type only have the possibility of computing a full set of sensitivities in the static domain by the ´sens´ section. In this paper, an extension is described for the sensitivity analysis to be also used in frequency and time domains. Moreover, a method for determining nonstandard outputs, as sensitivity of noise figures or sensitivity of a local warming up somewhere in the circuit, is proposed. Nonstandard sensitivity analyses are demonstrated by solving two examples - the first practical one, from the RFIC design area, contains an improvement of noise figure accuracy, and the second special one serves as a natural test of the algorithm precision in static and time domains. The derived methods have been implemented into the author´s circuit interactive program (CIA), with necessary enhancing of the efficiency of the algorithms by reusing components of LU-factorizations created by frequency and time analyses.