A Multi-Channel Auditory Signal Encoder with Adaptive Resolution Using Volatile Memristors

This paper presents a bioinspired, multi-channel auditory signal encoder based on volatile memristors, designed to mimic the short-term adaptation behavior of the human auditory system. The system integrates a threshold generator with an asynchronous delta modulator (ADM) to dynamically adjust threshold voltages based on real-time memristor behavior. The encoder is implemented with standard 130nm CMOS technology, occupying a compact area of 0.44 mm × 0.185 mm per channel and consuming 299.85 μW per channel. The adaptive resolution of the encoder is validated in simulations using a memristor model derived from real device data, demonstrating adaptive output firing rates as a result of memristor resistance volatility. With a maximum delay of 45.25 ns for a 1 kHz sound input, the design is well-suited for spike-domain neuromorphic systems.