VLSI IMPLEMENTATION OF PULSATING NEURAL NETWORKS

We describe a generic approach for realizing networks of pulsating neu rons based on charge pumping of interface states situated in the chann el of MOS transistors. Two basic building blocks will be described: th e pulse activated charge pumping (PSCP) synapse, and the charge sensit ive oscillator (CSO). The PSCP synapse which operates as either a shor t or a long term memory device which produces a charge packet proporti onal to the number of pulses applied to its input, will be described i n detail together with experimental results demonstrating its capabili ty. The CSO circuit which is a charge controlled oscillator will be de scribed together with simulations of its output frequency dependence o n its input voltage, and the relation between the temporal dependence of output waveform on its input charge.