A subthreshold CMOS circuit for a piecewise linear neuromorphic oscillator with current-mode low-pass filters

Authors:
Kazuki Nakada;Tetsuya Asai;Tetsuya Hirose;Hatsuo Hayashi;Yoshihito Amemiya
Affiliations:
Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 808-0196, Japan;Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido 060-0814, Japan;Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido 060-0814, Japan;Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 808-0196, Japan;Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido 060-0814, Japan
Venue:
Neurocomputing
Year:
2007

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Abstract

We propose an analog current-mode subthreshold CMOS circuit implementing a piecewise linear neuromorphic oscillator. Our circuit was derived from a piecewise linear oscillator model proposed by Matsuoka, well known as a building block for constructing a robot locomotion controller. We modified Matsuoka's oscillator to be suitable for analog current-mode integrated circuit implementation, and designed and fabricated it as an analog current-mode circuit. Through circuit simulations and experimental results on a fabricated chip, we demonstrate that our neuromorphic oscillator generates a stable oscillation, and the amplitude and frequency of the oscillation can be controlled by tuning bias currents over a wide range. Further, we propose a compensation for device mismatch in the neuromorphic oscillator through feedback from a coupled physical system.