This paper presents the design and the simulation of pixel for real time three dimensional (3D) measurements based on
Time of Flight (TOF) technique. The pixel is designed to detect the time delay between transmitted and reflected light.
Based on 4T active pixel, A TXD transfer gate is added to realize TOF function. In order to enhance lateral drift field,
the pixel adopts a split device structure. The implant energy and dose of photodiode are simulated in 2D carefully with
simulation tool TCAD. 3D simulation is presented to verify the 3D measurement function of the pixel. The simulation
results show that proposed pixel can achieve 10ns transfer time and meet the requirement for TOF.