Sensitivity analysis of the millimeter-wave heat performance parameters f/sub T/ and f/sub max/ to errors in the equivalent circuit elements

For MM-wave FETs, the performance parameters f/sub T/ (transition frequency) and f/sub max/ (max. oscillation frequency) are usually calculated from inexactly known equivalent circuit models. The consequences of errors in the model on f/sub T/ and f/sub max/ art evaluated through a sensitivity analysis of the complete equivalent circuit. This analysis shows quantitatively how f/sub T/ and f/sub max/ depend differently on element errors in the model, and that f/sub max/ is especially susceptible to errors in R/sub G/, R/sub i/ and R/sub D/.<>