25 January 2010 High-speed charge transfer pinned-photodiode for a CMOS time-of-flight range image sensor
Author Affiliations +
This paper presents a structure and method of range calculation for CMOS time-of-flight(TOF) range image sensors using pinned photodiodes. In the proposed method, a LED light with short pulse width and small duty ratio irradiates the objects and a back-reflected light is received by the CMOS TOF range imager.Each pixel has a pinned photodiode optimized for high speed charge transfer and unwanted charge draining. In TOF range image sensors, high speed charge transfer from the light receiving part to a charge accumulator is essential.It was found that the fastest charge transfer can be realized when the lateral electric field along the axis of charge transfer is constant and this conditon is met when the shape of the diode exactly follows the relationship between the fully-depleted potential and width. A TOF range imager prototype is designed and implemented with 0.18um CMOS image sensor technology with pinned photodiode 4transistor(T) pixels. The measurement results show that the charge transfer time is a few ns from the pinned photodiode to a charge accumulator.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiroaki Takeshita, Hiroaki Takeshita, Tomonari Sawada, Tomonari Sawada, Tetsuya Iida, Tetsuya Iida, Keita Yasutomi, Keita Yasutomi, Shoji Kawahito, Shoji Kawahito, } "High-speed charge transfer pinned-photodiode for a CMOS time-of-flight range image sensor", Proc. SPIE 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI, 75360R (25 January 2010); doi: 10.1117/12.846277; https://doi.org/10.1117/12.846277


A logarithmic low dark current CMOS pixel
Proceedings of SPIE (April 29 2016)
A QVGA size CMOS time of flight range image sensor...
Proceedings of SPIE (January 26 2006)
CMOS BDJ photodiode for trichromatic sensing
Proceedings of SPIE (February 15 2012)

Back to Top