Implementation of centroid defuzzifier block using CMOS circuits

Abstract

A voltage input current output multiplier and a current input voltage output divider circuit to realize the centre of gravity defuzzifier strategy is described in this paper. The proposed circuit has a compact architecture operating at higher speed and higher input voltage range compared to previously presented structures. The transistors operate in the both saturation and ohmic regions. The circuit operates with a single supply voltage of 3.3V in a 0.35 mum CMOS technology. The total harmonic distortion (THD) of multiplier is less than 1.1%, the linearity error is also less than 3%, and -3db frequency is more than 180 MHz with voltage input range of 3Vp-p. Simulation results are given to verify the functionality of the proposed circuits.