The Japan Society of Applied Physics

2023 International Conference on Solid State Devices and Materials

2023 International Conference on Solid State Devices and Materials

Sep 5, 2023 - Oct 31, 2023
Nagoya Congress Center

11:45 AM - 12:00 PM

[J-4-04] A High-Accuracy Time-of-Flight Image Sensor Using Cascaded 4-Tap Demodulators and Dual-Phase Short-Pulse Modulation

○HYEUN WOO KWEN1, Hiroaki Nagae1, Keita Yasutomi2, Keiichiro Kagawa2, Shoji Kawahito2 (1. Graduate School of Integrated Sci. and Tech., Shizuoka Univ. (Japan), 2. Res. Inst. of Electronics, Shizuoka Univ. (Japan))

https://doi.org/10.7567/SSDM.2023.J-4-04

This paper presents a high-accuracy time-of-flight (ToF) image sensor using cascaded 4-Tap demodulators and a new operation using dual-phase short-pulse modulation. A 4-Tap demodulator with cascaded structure achieving high-speed demodulation with a relatively small pixel pitch of 8.4 µm is successfully designed and implemented. Measurement results show that the proposed demodulator using dual-phase short-pulse modulation have high absolute accuracy of better than 4% of error of the segmented range (100cm) without any calibrations in range-shifted ToF measurements.