Exact Discrete Time Representation of Continuous Time Systems

Abstract The solutions proposed in the literature for the representation of a continuous time system by a difference equation all have the disadvantage to be accurate at very large sampling frequencies only. In this paper a new exact discrete time representation, based on the instantaneous sampling method, is presented. It requires almost no oversampling and uses broadband digital differentiators. The proposed technique results in less complex discrete time models than the integrated sampling method.