IMPLEMENTATION OF CMOS FUZZY CONTROLLERS AS MIXED-SIGNAL INTEGRATED-CIRCUITS

This paper discusses architectural and circuit-level aspects related t o hardware realizations of fuzzy controllers, A brief overview on fuzz y inference methods is given focusing on chip implementation, The sing leton or zero-order Sugeno's method is chosen since it offers a good t radeoff between hardware simplicity and control efficiency, The CMOS m icrocontroller described herein processes information in the current-d omain, but input-output signals are represented as voltage to ease com munications with conventional control circuitry, Programming functiona lities are added by combining analog and digital techniques, giving ri se to a versatile microcontroller, capable of solving different contro l problems, After identifying the basic component blocks, the circuits used for their implementation are discussed and compared with other a lternatives, This study is illustrated with the experimental results o f prototypes integrated in different CMOS technologies.