CMOS fuzzy logic controller supporting fractional polynomial membership functions

This paper presents a new Fuzzy Logic Controller (FLC) having the ability to support fractional polynomial membership functions. These functions are general forms of triangular and trapezoidal membership functions, and also those functions which are used in linguistic hedge FLC (LHFLC). A two-input, single-output Takagi–Sugeno–Kang (TSK) type 0 FLC is designed in 0.35 μm standard CMOS process. Analog realization of the circuit makes the design programmable and extendable, while having high speed and low power consumption. Also all the control signals and input signals are in voltage form and no need for digital programmability. Voltage mode realization of the circuits leads to a simple use of FLC with other circuits which are in voltage mode like sensors. Simulation results of the controller using HSPICE simulator and BSIM3v3 parameters, and comparing them with ideal results obtained from MATLAB software verify the functionality and performance of the design.