A Pixel Driver Design Technique to Obtain a High-Quality Depth Map in Indirect Time-of-Flight Sensors

Abstract

In this paper, we quantitatively analyze the effect of the skew of the modulation clock and demodulation clock of the indirect time-of-flight (ToF) sensor on the depth map, and propose a scheme to obtain high-quality depth maps. The proposed scheme is evaluated on a 10-mu m QVGA and 5-mu m VGA sensors with 90nm back-side illumination (BSI) technology, and the depth deviation is improved by 46% compared to a conventional sensor.