Modelling the Spiking Behaviour of Ganglion Cells

The human brain is one of the most efficient processors in the world and its structure enables it to process very complex information due to its plasticity and parallelism. The goal of neuromorphic circuits is to realize biologically equivalent neurons on a silicon chip using analog and digital systems. The focus of this paper is on a retinomorphic architecture, and more specifically implementing biologically equivalent ganglion cells present in the retina, using MOSFETs in Subthreshold region of operation. The paper presents a novel circuit to implement Bipolar and Ganglion cells which are biologically accurate. The circuit is implemented on the 180nm node and works on ± 500 mV supply. The maximum power consumption of the circuit is observed to be 20 μW.