WORKSHOP PAPER
Charge Overflow Control of A 3.96-µm 124dB HDR-DPS for Triple and Single Quantization Dual-Channel Operation
Ken Miyauchi1, Hsin-Li Chen2, Toshiyuki Isozaki1, Hideki Owada1, Rimon Ikeno1, Kazuya Mori1, Masayuki Uno1, Hideyuki Fukuhara1, Hirofumi Abe1, Masato Nagamatsu1, Isao Takayanagi1, Chih-Hao Lin2, Wen-Chien Fu2, Shou-Gwo Wuu2, Song Chen3, Ramakrishna Chilukuri3, Wei Gao3, Andrew P. Hammond3, Tsung-Hsun Tsai3, Chiao Liu3
1Brillnics Japan Inc., Tokyo, Japan
2Brillnics Inc., Hsinchu, Taiwan
3Reality Labs, Meta Platforms Inc., Redmond, WA, USA

Abstract

In this paper, a dual-channel triple-quantization digital-pixel-sensor (3Q-DPS) which simultaneously captures a 124 dB high dynamic range (HDR) visible-light image and a 60 dB dynamic range (DR) near-infrared (NIR) depth image in global shutter is described. The sensor architecture and basic operation have already been reported, and the charge overflow control technology of the shared floating diffusion (FD) 3Q-DPS will be presented in this paper. Specifically, asymmetric one-side buried overflow paths are developed to prevent charge mixing in FD and charge leakage to the drain. The design was studied with an analytical model and Technology Computer Aided Design (TCAD) simulation which is verified with measurements. With this overflow control, good photo-response linearity without charge mixing or charge loss is achieved in the dual-channel operation.
Year: 2025
Workshop: IISW
URL: https://doi.org/10.60928/839x-vbxq
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Keywords

dual-channel, 3Q-DPS, high dynamic range,

References