CMOS fuzzy logic controller in current mode

A current-mode fuzzy logic controller whose architecture is based on CMOS current mirrors is presented. A new definition of fuzzification is proposed that avoids the use of nonlogical concepts such as 'center of gravity' or 'centroid'. Due to a simple mathematical description of fuzzy logic connectives, a design automation strategy is provided permitting very effective electrical implementation of complex fuzzy systems by means of simple CMOS static current mirrors. Nine rules are programmable by means of current sources. The circuit consumes 2 mA at 5-V power supply for a core area of 0.4 mm/sup 2/. The fuzzy architecture can achieve 10 MegaFLIPS (fuzzy inferences per second). The chip was successfully used in the control of a metallic ball maintained by an electromagnetic field.