An Adaptive Photosensitivity Pixel for Synchronous Spiking Sensor

Abstract

This paper introduces a novel spiking pixel based on the synchronous readout operation. This design achieves pixel adaptation sensitivity to light, effectively overcoming a fundamental challenge of conventional pixels. It is achieved by assessing the trigger interval, which is the number of frame periods required for two successive pulses in the pixel's output, and dynamically adjusting the reference voltage. Combined with this technique, this novel spiking pixel can enhance sensitivity under low illumination conditions; simultaneously, it seeks to reduce trigger frequency in high-light conditions. Analysis of the proposed pixel reveals that it extends dynamic range and reduce the impact of the average relative error, representing a notable improvement over existing traditional pixel designs. When the ratio between the two integration voltage ranges of the proposed pixel is 9, the dynamic range can be extended by 18.26 dB. With integration voltage ranges of 300 and 900 mV, the mean average relative error of the proposed pixel is 0.1261 under varying Process, Voltage, and Temperature conditions, demonstrating superior performance compared to the traditional pixels.