Abstract
The design of various fuzzy architectures with mixed signal current mode techniques have been discussed here. The proposed work focuses on generation of various shaped membership functions like triangular, trapezoidal, guassian. It also describes the implementation of a membership function circuit using MOSFETs. It implements the simplified inference mechanism wherein MOS analog circuits are used to represent signals as currents. However, the whole system is externally communicated through voltages, thus enabling simple interface with conventional control circuitry. The design requires only one differential pair for each membership function & the output currents are automatically normalized. The normalization circuit is integrated within the fuzzifier. By choosing different reference voltages and different W/L ratios, various types of membership functions can be accomplished. The fuzzy rule evaluation or fuzzy inference is also discussed with reconfigurable inference engine.
