Design of a bio-inspired CMOS circuit realizing features of binocular rivalry between left and right eye

摘要

This paper is an attempt to realize a unique feature of visual brain on CMOS circuit. There is a binocular rivalry phenomenon of visual brain in which, if two different images are shown to left and right eye then they compete for perceptual dominance such that one image become visible while the other get suppressed. Thus inspired from the concepts of neuromorphic and bio-inspired computing circuits, we would like to explain various features of binocular rivalry (BR) using Adaptive Winner Takes All (WTA) CMOS circuit. The application of this work lies in the fact that CMOS circuit can be implanted in the robot brain and hence opens a window in the area of artificial intelligence. The circuit is simulated using BSIM3 level 49 MOSFET models using T-Spice 0.35μm CMOS process. The key structure is an electronic synapse which is based around a floating-gate pFET. Thus the simulated results of the circuit depict two main features of binocular rivalry i.e., dominance and suppression of images and neural adaption. The circuit consumes 0.4mW total power, shows thermal stability of about 1.23μA/°C and occupies 25μm×20 μm chip area. Moreover a third and remarkable feature in BR is focused attention, which may considerably influence the binocular rivalry switching and can be attained using meditation. We would like to modify the circuit with additional, control of adaption at floating gate, circuitry to realize the later feature as well. The paper catered the later feature in future work.