A CMOS Image Sensor Using Multiple Tap Lateral-Electric-Field Charge Modulators for Time-of-Flight Range Imaging

Abstract

This paper presents a 160×240-pixel CMOS Time-of-Flight range imager using pinned-photodiode high-speed 4-tap outputs lock-in pixels. A CMOS TOF range imager with the multiple-tap charge modulators is expected to have background light cancelling capability in one frame and to improve range resolution with a shifted short light pulse. In this paper, we report the design, implementation and evaluation results of the TOF range imager using the 4-tap LEF modulator (LEFM). The TOF range imager has a range resolution of less than 3.2mm.