Robust sampled-data control of nonlinear output feedback systems

Robust continuous-time control for nonlinear output feedback systems has been well studied in literature. In particular, the robust controller is based on the high gain domination approach. It is interesting to further study the digital implementation of the controller in a practical situation when sampled data with possible delay are available for feedback design. A fundamental difficulty lies in the fact that high robustness requires a high control gain which is however constrained by sampling bandwidth. In this paper, we apply a recently established sampled-data control framework to reveal the quantitative tradeoff between robustness and sampling bandwidth in nonlinear systems.