A Simple CMOS-Based Membership Function Circuit
Analog Integrated Circuits and Signal Processing
Design of an analog CMOS fuzzy logic controller chip
Fuzzy Sets and Systems - Fuzzy systems
Optimised PWL recursive approximation and its application to neuro-fuzzy systems
Mathematical and Computer Modelling: An International Journal
A circuit implementation of an ultra high speed, low power analog fully programmable MFG
Journal of Intelligent & Fuzzy Systems: Applications in Engineering and Technology
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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