An analog CMOS universal membership function circuit with fully independent, adjustable parameters

A novel CMOS membership function circuit (MBC) is presented. It is based on a linear tunable transconductor proposed in [1] and implements trapezoidal/triangular functions with all parameters (slope, position, width, eight andamplitude) independently and continuously adjustable. It is suitable to be used in analog fuzzy circuits working in current mode. The computer simulations that verify the characteristics and performances of this circuit are shown.