Accession Number:

ADA214277

Title:

A Modifiable Weight Circuit for Use in Adaptive Neuromorphic Networks

Descriptive Note:

Presentation paper

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

Report Date:

1989-09-01

Pagination or Media Count:

2.0

Abstract:

The Naval Ocean Systems Center is involved in a collaborative effort with the Naval Weapons Center to implement neuromorphic networks in analog integrated circuitry using CMOS technology. We are investigating the use of a floating-gate charge storage device as a modifiable, non-volatile analog memory element for representing and storing interconnection weights between processing units, and have designed a simple circuit to sense this charge and perform the multiplicative synaptic function. We employ the mechanism of avalanche or hot- carrier injection to move charge onto a floating-gate structure. This mechanism was first used in the mid-1970s for digital memory applications in the FAMOS floating gate avalanche injection MOS device, which consisted of a p-channel MOSFET with an isolated gate. At an appropriate biasing voltage, hot electrons are generated in avalanche breakdown, which have sufficient energy to conduct across the gate oxide and charge the gate. In an n-channel device, a complementary process takes place, with holes rather than electrons injected onto the floating gate. The potential due to the charge influences the state of the transistor under the gate just as would an externally applied voltage. Multimedia Reprint, Naval document. RRH

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE