CMOS Based Current Mode Defuzzifier Circuit for Analog Fuzzy Inference System

This paper presents the design of CMOS based defuzzification circuit for Analog Fuzzy Inference system (FIS) application. The defuzzification circuit is implemented using a Multiplier-Divider circuit (MD). The proposed defuzzification scheme is applicable to Takagi-Sugeno systems in which the consequent part of fuzzy rules is singleton values. Center of gravity (COG) is the defuzzification scheme used to convert fuzzy control actions into crisp control signals. The various advantages of the proposed design are - less number of components, high speed operation, wide dynamic range and low power consumption. The performance characteristics and the workability of the proposed circuit are demonstrated using spice simulation.