Sampled Data Systems
A. Feuer, Graham C. Goodwin · 2019
In many applications the sampling rate may be constrained and as a result the approaches may prove inappropriate. This realization prompted many researchers to develop tools to analyze systems containing both continuous-and discrete-time signals, referred to as sampled data systems. The advances in digital computer technology have led to its application in a very wide variety of areas. In particular, it has been used to replace the analog controller in many control systems. However, to use the digital computer as a controller one has to overcome the following problem: The input and output signals of the physical plant are analog, namely, continuous-time signals, and the digital computer can only accept and generate sequences of numbers, namely, discrete-time signals. The chapter discusses the one mathematical tool which is based on frequency domain considerations and seems to be a very natural approach.