Beyond von Neumann Architecture: Brain-Inspired Artificial Neuromorphic Devices and Integrated Computing

Abstract

Brain-inspired parallel computing is increasingly considered a solution to overcome memory bottlenecks, driven by the surge in data volume. Extensive research has focused on developing memristor arrays, energy-efficient computing strategies, and varied operational mechanisms for synaptic devices to enable this. However, to realize truly biologically plausible neuromorphic computing, it is essential to consider temporal and spatial aspects of input signals, particularly for systems based on the leaky integrate-and-fire model. This review highlights the significance of neuromorphic computing and outlines the fundamental components of hardware-based neural networks. Traditionally, neuromorphic computing has relied on two-terminal devices such as artificial synapses. However, these suffer from significant drawbacks, such as current leakage and the lack of a third terminal for precise synaptic weight adjustment. As alternatives, three-terminal synaptic devices, including memtransistors, ferroelectric, floating-gate, and charge-trapped synaptic devices, as well as optoelectronic options, are explored. For an accurate replication of biological neural networks, it is vital to integrate artificial neurons and synapses, implement neurobiological functions in hardware, and develop sensory neuromorphic computing systems. This study delves into the operational mechanisms of these artificial components and discusses the integration process necessary for realizing biologically plausible neuromorphic computing, paving the way for future brain-inspired electronic systems. To fully mimic biorealistic artificial neural networks, the integration of artificial neurons and synapses, hardware implementation of neurobiological functionality, and sensory neuromorphic computing are required. Spanning from single-component devices to hierarchically complex architectures, the operation mechanism of each artificial component and the realization of bioplausible neuromorphic computing through integration are comprehensively discussed for future brain-inspired electronic systems. image