A Spike-Based Background Light Suppression Time-of-Flight Pixel for Outdoor Applications

In this paper, a spike-based background light suppression ToF pixel is proposed. This pixel adopts a novel in-pixel background light suppression circuit. The in-pixel background light suppression circuit can realize effective self-suppression of the background light and convert the received infrared light intensity to the number of spikes. The proposed ToF pixel is designed in a 0.11µm CMOS image sensor technology with a physical size of 27.5 × 27.5µm2. Simulation results illustrate that the proposed pixel is capable of suppressing background light of 30dB BRS without filter. The ToF sensor with the proposed pixel can not only used in indoor applications but also used in high intensity background applications.