SAMPLED-DATA SIMULATION OF PERIODICALLY SWITCHED LINEAR CIRCUITS - Computer Methods for Analysis of Mixed-Mode Switching Circuits - page 117

3. Time-Domain Sensitivity

The need for quantifying the effect of the variation of the value of
circuit parameters on the performance of the circuits is signified by the
trend that the minimum feature size of MOS devices in modern CMOS
technologies is being scaled down much more aggressively as compared
with the improvement in process tolerance [51]. For example, the resis-
tance of poly resistors in a typical CMOS process has an error of
±20% approximately and that of n-well resistors has an error of ±30%
approximately. Analysis of these effects is vital to both the performance
of circuits and the yield of production. As compared with costly statis-
tical analysis, such as Monte Carlo analysis, sensitivity analysis provides
a deterministic and effective measure of the effect of the variation of one
circuit parameter on the performance of the circuits.