Adaptive synapse cell providing both excitatory and inhibitory c

Details Adaptive synapse cell providing both excitatory and inhibitory c Adaptive synapse cell providing both excitatory and inhibitory c

1989-07-13

1990-09-11

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307450, 307464, 307529, 364807, 365185, H03K 1921

Patent

active

049565648

ABSTRACT:
The present invention covers a synapse cell for providing a weighted connection between an input voltage line and an output summing line having an associated capacitance. Connection between input and output lines in the associative network is made using one or more floating-gate transistors which provide both excitatory as well as inhibitory connections. As configured, each transistor's control gate is coupled to an input line and its drain is coupled to an output summing line. The floating-gate of the transistor is used for storing a charge which corresponds to the strength or weight of the neural connection. When a binary voltage pulse having a certain duration is applied to the control gate of the floating-gate transistor, a current is generated which acts to discharge the capacitance associated with the output summing line. The current, and therefore the resulting discharge, is directly proportional to the charge stored on the floating-gate member and the duration of the input pulse.

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Hoffman et al., "Neurons With Hysteresis Form a Network That Can Learn Without Any Changes in Synaptic Connection Strengths", AIP Conf. Proceedings, vol. 151, 1986, pp. 219-226.
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