Analysis of errors in sampled-data systems
Jack Sklansky, John R. Ragazzini · Electrical Engineering · 1955
THE system error ε(t) in a sampled-data feedback system is an important design parameter. It is defined as the difference between the actual output c(t) and the desired output cd(t), i.e.,$\epsilon (t) \buildrel{\triangle}\over {=} c_{d}(t)-c(t)$. The system error has two components: (1) organic error, due to system energy storages; and (2) ripple, due to the sampling process. Formulation of these errors is obtained through the use of z-transform1and ordinary Laplace transform techniques. (z-transforms are merely Laplace transforms of pulsed data and are usually rational functions in εsTin which εsThas been replaced by z.)