Properties of sensitivity and complementary sensitivity functions in single-input single-output digital control systems
Hak-Kyung Sung, Shinji Hara · International Journal of Control · 1988
Sensitivity and complementary sensitivity functions play a key role in feedback control system design. This paper is concerned with the relation between the sampling period and the properties of these functions in digital control systems. Some integral constraints and the lower bounds of the H ∞-norm are derived, which show that the feedback performance for the unstable plant with the stable digital compensator can be improved as the sampling period goes to zero.