Robustness of Zero-Shifting via Generalized Sampled-data Hold Functions

Jim S. Freudenberg, Rick H. Middleton and Julio H. Braslavsky
Abstract: In this paper we study robustness and sensitivity properties of a sampled­data feedback system with a Generalized Sampled­data Hold Function (GSHF). We argue that shifting nonminimum phase zeros using GSHF control can lead to difficulties unless the zero is outside the closed loop bandwidth. 
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