A 16 X 16 NONVOLATILE PROGRAMMABLE ANALOG VECTOR-MATRIX MULTIPLIER

In this paper, we present a 16 x 16 analog vector-matrix multiplier wi th analog electrically erasable and programmable read-only memories (E EPROM's) used as nonvolatile storage for the weight matrix values. Eac h weight matrix value is stored in an EEPROM transistor as a change of the threshold voltage, and the same EEPROM transistor is used for the multiplication by utilizing the square-law characteristic of the meta l-oxide-semiconductor field-effect transistor. This allows a very simp le circuit for the multiplier array with a size of about 1 x 1 mm(2). The vector-matrix multiplier has been fabricated in a 1,5-mu m single- poly complementary metal-oxide-semiconductor/EEPROM technology and suc cessfully tested.