Application of continuous system design concepts to the design of sampled data systems

THE THEORY associated with the design of sampled data systems1 has progressed to the point where it is possible to design a digital controller pulse transfer function so as to obtain an over-all system pulse transfer function which will meet certain specifications such as being stable, and physically realizable; having a minimum settling time in response to a given input; having ripple-free operation after a short transient, etc.