Paper Abstract and Keywords |
Presentation |
2022-08-08 10:00
[Invited Talk]
Low-Noise Multi-Gate Pixel Transistor for Sub-Micron Pixel CMOS Image Sensors Naohiko Kimizuka, Shota Kitamura, Akiko Honjo, Koichi Baba, Toshihiro Kurobe, Hideomi Kumano, Takuya Toyohuku (Sony Semiconductor Solutions), Kouhei Takeuchi, Shota Nishimura (Sony Semiconductor Manufacturing), Akihiko Kato, Tomoyuki Hirano, Yusuke Oike (Sony Semiconductor Solutions) SDM2022-34 ICD2022-2 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
The pixel size of CMOS image sensor (CIS) continues to be rapidly decreasing due to strong demand from mobile applications. As a result, the area in which the pixel transistor can be integrated also decrease, making it difficult to maintain the transistor size (channel length and width). In particular, the pixel transistor size of a source follower (SF) amplifier determines the noise performance. Therefore, at this time, we propose a new low-noise multi-gate pixel transistor, specially customized for an SF amplifier of CIS. The random telegraph signal (RTS) noise and 1/f noise have been improved by maximizing the effective
channel width and by not performing impurity doping into the channel. Compared to a conventional planar-type pixel transistor with same footprint, RTS noise and 1/f noise have been reduced by 91% and 43%, respectively. The transconductance has been improved by 43%, which contributes to reduce thermal noise. We could evaluate imaging characteristics using a prototype with 0.7µm pixel, having new multi-gate pixel transistor we have developed. It was revealed that proposed multi-gate structure dedicated to pixel transistor is a promising candidate to solve issues emerging from pixel size shrinkage. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
pixel transistor / RTS noise / 1/f noise / multi-gate structure / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 122, no. 148, SDM2022-34, pp. 7-7, Aug. 2022. |
Paper # |
SDM2022-34 |
Date of Issue |
2022-08-01 (SDM, ICD) |
ISSN |
Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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SDM2022-34 ICD2022-2 |
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