Title :
Mixed analog-digital fuzzy logic controller with continuous-amplitude fuzzy inferences and defuzzification
Author :
Bouras, Stamatis ; Kotronakis, Manousos ; Suyama, Ken ; Tsividis, Yannis
Author_Institution :
Div. of Comput. Sci., Nat. Tech. Univ. of Athens, Greece
fDate :
5/1/1998 12:00:00 AM
Abstract :
A fuzzy logic controller has been realized using mixed analog-digital CMOS very large scale integration (VLSI) circuits for application in cases where the input and output variables are in analog form. It employs a new architecture where time sweeping of variables allows continuous-amplitude evaluation of fuzzy inferences and defuzzification during each evaluation cycle without having to discretize input and output variables. Direct processing of the analog input signal is used to obtain the corresponding crisp value; the digital portion is used only for programmability. No A/D and D/A converters are needed. The controller can handle three inputs, one output, and 25 programmable fuzzy rules. The test IC chips were fabricated using 0.7-μm CMOS technology. A control problem of stabilizing a ping-pong ball in a tube with a controllable air flow has been successfully demonstrated
Keywords :
CMOS integrated circuits; VLSI; fuzzy control; fuzzy logic; mixed analogue-digital integrated circuits; position control; programmable controllers; 0.7 mum; 0.7-μm CMOS technology; continuous-amplitude fuzzy inferences; controllable air flow; crisp value; defuzzification; mixed analog-digital CMOS VLSI; mixed analog-digital fuzzy logic controller; programmability; programmable fuzzy rules; Analog-digital conversion; CMOS analog integrated circuits; CMOS integrated circuits; CMOS logic circuits; CMOS technology; Fuzzy control; Fuzzy logic; Integrated circuit testing; Signal processing; Very large scale integration;
Journal_Title :
Fuzzy Systems, IEEE Transactions on
