Fuzzy Multiple-Input Maximum and Minimum Circuits in Current Mode and their Analyses Using Bounded-Difference Equations

Authors:
Mamoru Sasaki;Takahiro Inoue;Fumio Ueno;Yuji Shirai
Affiliations:
Kumamoto Univ., Kumamoto-shi, Japan;Kumamoto Univ., Kumamoto-shi, Japan;Kumamoto Univ., Kumamoto-shi, Japan;Yatsushiro National College of Technology, Yatsushiro-shi, Japan
Venue:
IEEE Transactions on Computers
Year:
1990

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Abstract

Multiple-input maximum and minimum circuits in current mode are proposed. The operation of these circuits is formulated using simultaneous bounded-difference equations. The exact analyses are performed by solving the bounded-difference equations. The accuracy of these circuits is better than the accuracy of binary tree realizations using two-input max/min circuits because no accumulation of errors occurs; furthermore, the operation speed is higher than the speed of the binary tree realization. The proposed circuits consist of only MOS transistors and are compatible with standard MOS fabrication processes. These circuits are useful building blocks for a real-time fuzzy controller and a fuzzy computer.