THE CHARGE CONTROLLED ANALOG SYNAPSE

A generic circuit, the charge controlled analog synapse (CCAS) is pres ented. The CCAS is designed to be the basic building block in microele ctronic realizations of large scale artificial neural networks. It is based on representing the synaptic strength as a charge packet which c ontrols the junction capacitance of a reverse biased diode. The CCAS i s a synapse with three main features: (i) a small cell with few compon ents per cell; (ii) a short term dynamic memory, and (iii) a variable accuracy which depends on the cell size. The principle of operation of the CCAS is explained. Details of the design of a first prototype are given. Experimental results which substantiate the theoretical predic tions are presented. Finally, the basic properties of the CCAS are dis cussed. Copyright (C) 1996 Elsevier Science Ltd