A modular current-mode classifier circuit for template matching application

ln this brief, a current-mode Euclidean distance calculator circuit is prop osed to play the role of a classifier. This classifier circuit is designed based on a subtracter circuit, an absoluter circuit, a squarer/divider:circ uit. and a square-rooter/multiplier circuit. The modular design of this cla ssifier allows it to be easily extended for classification application with more input dimensions by doing some proper signal-scaling work due to the dynamic range limited by the square-rooter/multiplier circuit. This classif ier circuit has been fabricated with a 0.6-mu m single-polysilicon double-m etal CMOS process. Both simulation results and measurements of the implemen ted chip are presented to confirm the function of this classifier.