Analog computer study of sampled-data systems

TO OBTAIN a satisfactory solution to many of the complex control system problems which are currently being encountered, it has been necessary to apply the combination of digital controls and analog controls to the system. Whenever a transition is made between a digital system and an analog system, the embodiment of a sampled-data system is obtained. Likewise, in applications in which a number of similar processes are controlled through a time-sharing or multiplexed system by one common computer or controller, a sampled-data system is also obtained. In such cases the system performance is determined not only by the characteristics of the continuous portion of the system within the control loop, but also by the sampled-data system parameters, such as type of holding circuit and sampling rate. To set up specifications properly for such control systems, it is necessary to understand the effect of the sampled-data system parameters upon the over-all system performance.