A New Highly Controllable and Accurate Algorithm for Defuzzifier Circuit Implementation

Authors

1 Department of Electrical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.

2 Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.

Abstract

Defuzzifier circuit is one of the most important parts of fuzzy logic controllers that determine the output accuracy. The Center Of Gravity method (COG) is one of the most accurate methods that so far been presented for defuzzification. In this paper, a simple algorithm is presented to generate triangular output membership functions in the Mamdani method using the multiplier/divider circuit and mirror current CMOS technology. As well as the method simplicity, the method is highly accuracy and controllable in the height, slope of output membership functions, number of rules and number of input/output membership functions cause to use mixed voltages. This method covers each type of the input fuzzifier. The proposed Circuits in this paper are implemented by a standard 0.35um CMOS technology in Hspice software

Keywords


[1] S.S.Lancaster, M.J.Wierman, “Empirical study of defuzzification”, 22nd International Conference of the North American Fuzzy Information Processing Society (NAFIPS), pp.121-126, 2003.
[2] T.J.Ross, “Fuzzy Logic with Engineering Applications”, second Edition, John Wiley & Sons, Ltd, 2004.
[3] J.Godjevac, “neuro-fuzzy controller design and application”, Presses Polytechiques et Universitires Romandes, Lausanne, Switzerland, 1997.
[4] H.g.G, X.h.Y,H.x.L, “Center of Gravity fuzzy System based on Regular Fuzzy Implication And It’s Probability Representation”, 7th International Conference on fuzzy systems and Knowledge Discovery (FSKD), vol.1, pp.134-138, 2010.
[5] Ch.Y.Chen, C.Y.Huang, B.D.Liu, ”A Current Mode Defuzzifier Circuit to Realize the Centroid Strategy”, IEEE International Symposium on Circuits and System, Vol.1, pp.609 - 612, 1997.
[6] S.Pammu, S.F.Quigley, “Novel Analogue CMOS Defuzzification Circuit”, IEE Proceeding Circuits Devices and Systems, Vol.142, No.3, 1995.
[7] D.Liu, C.-Y.Huang, H.-Y.Wu, “Modular current-mode defuzzification circuit for fuzzy logic controllers”, Electronics letters, Vol.30, No.16, 1994.
[8] Gh.Yosefi. S.Aminifar, Sh.Neda, M.A.Daneshwar, “Design of a Mixed-Signal Digital CMOS Fuzzy Logic Controller (FLC) Chip Using New Current Mode Circuits”, Aeu-international Journal of Electronics and Communications, Vol.65, No.3, pp.173-181, 2011.
[9] M.Soleimani, A.Khoei, Kh.Hadidi, “Current-Mode Analog CMOS Fuzzy Logic Controller”, Asia Pacific Conference on Circuits and Systems (APCCAS), pp.224-227, 2010.
[10] V.F.Dinavari, A.khoei, M.Soleimani, H.Mojarad, “Design of a Current-Mode Analog CMOS Fuzzy Logic Controller”, IEEE EUROCON, pp.211-217, 2009.
[11] H.Peyravi, A.Khoei, Kh.Hadidi, “Design of an Analog CMOS Fuzzy Logic Controller Chip”, Fuzzy Sets and Systems Vol.132, pp.245-260, 2002.
[12] M.Kaboli, A.Mallahzadeh, S.A.Alavian, “Design and Simulation of a Mixed Signal Fuzzy Logic Controller Chip”, International Journal of Advanced Engineering Sciences and Technologies (IJAEST), Vol.3, Issue.2, pp.149-154, 2011.
[13] M.F.Azeem. K.Govila, “Design of analog CMOS based fuzzy inference system”, IEEE International Conference on Fuzzy Systems, pp.1715-1720, 2006.
[14] F. J. Pelayo, I. Rojas, J.Ortega, A.Prieto, “Current-Mode Analogue Defuzzifier”, Electronics letters, Vol.29, No.9, 1993.
[15] M.Mokarram, A.Khoei, Kh.Hadidi, K.Gheysari, “Implementation of Centroid Defuzzifier Block using CMOS Circuit”, 4th International IEEE Conference Intelligent Systems, pp.2-26-2-29, 2008.
[16] A.Alikhani, A.Ahmadi, “A Novel Current-Mode Four-Quadrant CMOS Analog Multiplier/Divider”, (AEU) International Journal of Electronics and Communications, Vol.66, No.7, pp.581-586, 2012.
[17] M.Ranjbar, F.Razaghian, “High accuracy and low power consumption current-mode triangular fuzzifier circuit in CMOS technology“, 1th Isfahan’s Electrical Engineering National Conference (IEEC), Vol.3, No.6, 2012.