Design of a Feature Extracted CMOS Image Sensor with a Novel Integrator and a Configurable ADC

Lee, Hohyeon; Song, Minkyu

doi:10.1109/icm56065.2022.10005511

Cited by 1 publication

(1 citation statement)

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“…Prepositioning the functions of ISP into the pixel array is an effective approach to improve system integration as well as reduce power consumption. 19) Remarkably, some ISP functions, such as feature extraction and inter-frame difference, have already been successfully demonstrated at the sensor level. 20,21) The white balance (WB) is also a critical function in ISP for balancing the RGB signal gain to keep color constancy in various lighting conditions, which is related to the sensor environment adaptability.…”

Section: Introductionmentioning

confidence: 99%

Gate-controlled gain tuning of fully depleted silicon-on-insulator-based 1 T pixel for in-sensor white balance

Li,

Zhou,

et al. 2024

Jpn. J. Appl. Phys.

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White balance (WB) is a critical back-end processing function in image sensor to keep color constancy under various lighting conditions by adjusting RGB color channel gain values. In this work, we proposed a novel gate-controlled gain tuning method for Fully-Depleted Silicon-on-Insulator (FDSOI) one-transistor (1T) pixel to achieve WB inside sensor. Based on the pixel structure of p-well under BOX for sensing and nMOSFET on the top for readout, the 1T pixel output gain is modulated by MOSFET gate according to transistor transfer characteristic. About 5x gain modulation range in RGB spectrums photoresponse (nonlinearity<3%) is experimentally demonstrated in the devices fabricated by 22nm FDSOI-based technology. The scheme for in-sensor WB demonstration is provided with a novel 1T pixel array design, and the evaluation result shows in-sensor WB achieving almost equivalent performance (Delta-E deviation<1) compared with using conventional back-end WB.

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Section: Introductionmentioning

confidence: 99%