Design of optoelectronic activation, local memory and weighting circuits for Compact Integrated Optoelectronic Neural (COIN) Co-processor

The Compact Integrated Optoelectronic Neural (COIN) Co-processor, a prototype of artificial neural network implemented in hybrid optics and optoelectronic hardware, aims to implement a multi-layer neural network algorithm by performing parallel and efficient neural computations. In this thesis, we design and implement optoelectronic thresholding (activation), weighting and memory circuits for the COIN processor. The first version involved the design of fixed thresholding and weighting functions. The second version incorporated a local capacitive memory element as well as variable weighting schemes. The third version introduces an additional flexibility for variable thresholding by changing the bias voltages of control transistors. A 9x9 array of proof of concept printed circuit board (PCB) with an area of 4.5x 4.5 in² and total power consumption of 1.37W was designed and tested for version-I optoelectronic neuron architecture. A spice simulation was performed for the last two versions for integrated circuit (IC) implementation. The work developed in this thesis provides some guidance on the design of optoelectronic neural activation function for the realization of the embodiment of the fully integrated COIN Co-processor to be built in the future.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2015

Author dc:creator

• Tadele, Wegene Haile

Advisor dc:contributor.advisor

• Cardinal Warde.

• Electrical Engineering and Computer Science.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/106739

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/106739