学術雑誌論文

学術雑誌論文

text

Sensors. 2021, 21(7), p. 2506

A pixel design of a branching ultra-highspeed image sensor

MDPI

英語

text

2021-04-01

https://doi.org/10.3390/s21072506

Ngo NH, Shimonomura K, Ando T, Shimura T, Watanabe H, Takehara K, Nguyen AQ, Charbon E, Etoh TG. A Pixel Design of a Branching Ultra-Highspeed Image Sensor. Sensors. 2021; 21(7):2506. https://doi.org/10.3390/s21072506.

A burst image sensor named Hanabi, meaning fireworks in Japanese, includes a branching CCD and multiple CMOS readout circuits. The sensor is backside-illuminated with a light/charge guide pipe to minimize the temporal resolution by suppressing the horizontal motion of signal carriers. On the front side, the pixel has a guide gate at the center, branching to six first-branching gates, each bifurcating to second-branching gates, and finally connected to 12 (=6 × 2) floating diffusions. The signals are either read out after an image capture operation to replay 12 to 48 consecutive images, or continuously transferred to a memory chip stacked on the front side of the sensor chip and converted to digital signals. A CCD burst image sensor enables a noiseless signal transfer from a photodiode to the in-situ storage even at very high frame rates. However, the pixel count conflicts with the frame count due to the large pixel size for the relatively large in-pixel CCD memory elements. A CMOS burst image sensor can use small trench-type capacitors for memory elements, instead of CCD channels. However, the transfer noise from a floating diffusion to the memory element increases in proportion to the square root of the frame rate. The Hanabi chip overcomes the compromise between these pros and cons.

© 2021 the authors. Licensee MDPI, Basel, Switzerland. This article is licensed under a Creative Commons Attribution 4.0 International License.

85493

A pixel design of a branching ultra-highspeed image sensor

MDPI

英語

2021-04-01

Sensors

21

7

2506

https://doi.org/10.3390/s21072506

33916733

https://hdl.handle.net/11094/85493