Abstract
In this paper, we consider robust stability of single-input single-output continuous time-invariant systems with uncertainty. A robust stability (necessary and sufficient) condition for the system with a certain class of uncertainty is presented. The condition that a set of the plant and the nominal plant is contained in that class is clarified. In addition, it is shown that the robust stability (necessary and sufficient) condition does not depend on the number of poles of the plant and that of the nominal plant. In this framework, we can construct a control system with low sensitivity characeristics and robust stability.
