STABLE ZEROS OF SAMPLED LOW-PASS SYSTEMS

This paper studies analytical forms of criteria for ensuring that all zeros of a discrete system are stable when a continuous-time, strictly proper and low-pass plant is sampled by use of a zero order hold. Nec essary and sufficient conditions for stable zeros of a sampled system are developed. They are related to coefficients of a continuous-time t ransfer function and to a sampling period. This paper also presents su fficient conditions which are expressed in terms of coefficients of a continuous-time transfer function.