A Carbon Nanotube Synapse with Dynamic Logic and Learning

Abstract

A carbon nanotube (CNT) synapse emulates a biological synapse with its dynamic logic, learning, and memory functions induced by the interactions between CNTs and hydrogen ions in an electrochemical cell. A circuit of CNT synapses operates with extremely low-energy consumption and could potentially emulate the functions of the neuronal network.

Artificial synapse network on inorganic proton conductor for neuromorphic systems

“…Such EPSC behaviour is quite similar to an EPSC process in a biological excitatory synapse 34 . The energy dissipation of single spike event is estimated to be B45 pJ, which is lower than that of the artificial synapse based on conventional CMOS circuit 35 and is comparable to the energy dissipation of the reported hardware-based artificial synapse 8,9,15 . At present, the channel width of our synaptic transistors is large (B1 mm), and it can be scaled down to submicrometer scale by a photolithography method.…”

“…The dendrite spine synapses not only provide an anatomical substrate for memory storage and synaptic transmission but also serve to increase the number of possible contacts between neurons. Recently, three-terminal transistors with tunable channel conductivities have been proposed for synaptic functions emulation [13][14][15][16][17] . In such synaptic transistors, voltage pulses applied on the gate electrodes are usually regarded as the presynaptic spikes or external stimuli.…”

Simulation of Laterally Coupled InGaZnO4-Based Electric-Double-Layer Transistors for Synaptic Electronics

“…For the hardware implementation of neuromorphic computation, various solid-state devices have been proposed to emulate biological synapses [2]- [4]. Specially, ionic/electronic hybrid transistor has emerged as a promising candidate for artificial synapse [5], [6]. Recently, our group also reported indium-zinc-oxide synaptic transistors gated by inorganic electrolytes [7], [8].…”

Synaptic Behaviors Mimicked in Flexible Oxide-Based Transistors on Plastic Substrates

“…Specially, three-terminal carbon nanotube synaptic transistor gated by PEG polymer dielectrics with mobile protons has also been proposed. Simultaneously, dynamic logic, learning, and memory functions of biological synapse were also demonstrated in such carbon nanotube synaptic transistor [7].…”