Linear Systems

Preface

Digital control systems design has become an important field in electrical engineering and in systems and control theory. One of the important and fundamental issues in digital control systems design is the filter or controller coefficient sensitivity because even vanishingly small perturbations in controller or filter coefficients may destabilize the resulting systems. In the actual engineering systems, the controllers or filters realized by microprocessors/microcontrollers do have some uncertainties due to limitations in available microprocessor/microcontroller memory, effects of finite word length (FWL) of digital processors, quantization of the A/D and D/A converters, and so on. Therefore, non-fragile (insensitive) control is becoming ...