Paper Abstract and Keywords |
Presentation |
2008-11-08 13:00
[Invited Talk]
Brain-inspired Integrated Systems with Time-domain Information Processing Takashi Morie, Hideki Tanaka, Daisuke Atuti, Keisuke Korekado, Kazuki Nakada (Kyushu Inst. of Tech.) NC2008-68 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
We have proposed merged analog-digital circuit architecture, which can perform multiply-and-accumulation and arbitrary nonlinear transformation operations using pulse modulation signals in the time domain, and have been developing various brain-inspired visual processing LSIs and neural network LSIs based on this architecture. Nonlinear transformation operation in the time domain is realized by using the voltage or current waveform having the same function shape as the nonlinear transformation. So far, we have adopted a scheme in which an arbitrary nonlinear waveform is shared with plural calculation circuits because the waveform generator circuit occupies a large chip area. In this scheme, each calculation circuit must operate synchronously. However, some processing models require asynchronous operation. Spike-timing dependent synaptic plasticity (STDP) is such a case. As another case, in this report, we introduce similarity (distance) calculation circuits that use a relative spike timing difference. We also show CMOS circuit implementations of a phase oscillator, which is a model of quasiperiodically-firing neurons, with both synchronous and asynchronous schemes. From circuit simulation results, it is expected that the operation time and power consumption are drastically reduced by asynchronous spike-timing event driven operation. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
time-domain information processing / CMOS integrated circuit / pulse-modulation signal / PWM/PPM / spiking neuron / phase oscillator / asynchronous operation / similarity calculation circuit |
Reference Info. |
IEICE Tech. Rep., vol. 108, no. 281, NC2008-68, pp. 55-60, Nov. 2008. |
Paper # |
NC2008-68 |
Date of Issue |
2008-10-31 (NC) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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NC2008-68 |
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