Mixed-mode Vlsi Implementation of Fuzzy Art

Marc Cohen, Pamela Abshire and Gert Cauwenberghs Department of Electrical and Computer Engineering The Johns Hopkins University, Baltimore, MD 21218-2686 E-mail: marc,gert @bach.ece.jhu.edu ABSTRACT We present an asynchronous mixed analog-digital VLSI architecture which implements the Fuzzy Adaptive Resonance Theory (Fuzzy-ART) algorithm. Both classification and learning are performed on-chip in real-time. Unique features of our implementation include: an embedded refresh mechanism to overcome memory drift due to charge leakage from volatile capacitive storage; and a recoding mechanism to eliminate and reassign inactive categories. A small scale m feature size CMOS prototype with 4 inputs and 8 output categories has been designed and fabricated. The unit cell which performs the fuzzy min and learning operations measures 100 m by 45 m. Experimental results are included to illustrate performance of the unit cell.