A Modular Analog Architecture for Fuzzy Controllers

An analog circuit for function synthesis based on fuzzy logic is described. A modular architecture has been implemented: it allows to synthesize functions with the desired number of inputs, outputs and rules. A prototype with nine rules, two inputs and one output has been fabricated in a standard CMOS 1.5μm technology: the basic module featuring one rule requires a silicon area of 265μm × 140μm and the power consumption is below 350μW, using a 5V power supply. The rules are computed in parallel achieving a maximum measured delay response to a step input function of 600ns.