DESIGN AND TESTING OF A PI-CONTROLLER ASIC

This paper describes the design and testing of an application specific integrated circuit (ASIC) which provides the functionality of a digit al proportional plus integral error actuated controller with auxiliary Feedback. The ASIC controller can provide discrete time control of a range of continuous time systems by receiving analogue inputs via a si ngle multiplexed analogue to digital converter and providing an analog ue output via a digital to analogue converter. The controller has a fi xed sampling rate but allows both proportional and integral gains to b e adjustable using a digital control word. The controller functions ar e performed in hardware on a single ASIC so providing for the same fun ctionality as a software algorithm without the need for embedded softw are.