An analogue CMOS defuzzification circuit with representation of triangular membership functions

Author

Pammu, S. ; Quigley, S.F.

Author_Institution

Sch. of Electron. & Electr. Eng., Birmingham Univ., UK

Volume

6

fYear

1994

fDate

30 May-2 Jun 1994

Firstpage

495

Abstract

An improved method of performing defuzzification has been identified, together with the realisation of this method using analogue current mode circuitry. The circuits are suitable for fabrication in a standard CMOS process. The defuzzification method is based on the Normalisation Locked Loop (NLL) method, with improvements to allow the processing of triangular membership functions whilst ensuring that relative rule weights are preserved. The circuit used to implement this technique is from the family of saturation-mode, square-law circuits proposed by Bult and Wallinga (1987). Results of simulations are presented and discussed

Keywords

CMOS analogue integrated circuits; SPICE; analogue processing circuits; circuit analysis computing; fuzzy set theory; transient analysis; SPICE; analogue CMOS defuzzification circuit; analogue current mode circuitry; fuzzy processing; normalisation locked loop method; relative rule weights; saturation-mode square-law circuits; simulations; transient analysis; triangular membership functions; weight circuits; CMOS analog integrated circuits; CMOS process; Circuit simulation; Fabrication; Feedback circuits; Feedback loop; Fuzzy sets; Gravity; Performance evaluation; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on

Conference_Location

London

Print_ISBN

0-7803-1915-X

Type

conf

DOI

10.1109/ISCAS.1994.409634

Filename

409634