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Open AccessArticle

An Analog-Front ROIC with On-Chip Non-Uniformity Compensation for Diode-Based Infrared Image Sensors

by Mao Ye 1,*, Gongyuan Zhao 1,2,*, Yao Li 1 and Yiqiang Zhao 1,2
1
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, China
2
Tianjin Infrared Imaging Technology Engineering Center, Tianjin University, Tianjin 300072, China
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(2), 298; https://doi.org/10.3390/s19020298
Received: 24 November 2018 / Revised: 8 January 2019 / Accepted: 10 January 2019 / Published: 13 January 2019
(This article belongs to the Special Issue Advanced CMOS Image Sensors and Emerging Applications)
This paper proposes a CMOS front-end readout-integrated circuit (ROIC) with on-chip non-uniformity compensation technique for a diode-based uncooled infrared image sensor. Two techniques are adopted to achieve on-chip non-uniformity compensation: a reference dummy metal line is introduced to alleviate the dominant non-uniformity with IR-drop presented in large pixel array, and a current splitting architecture-based variable current source for diode bias is proposed to compensate other residual non-uniformity. A differential integrator is chosen as the main amplifier of readout circuit for its superior noise performance. For low power design, a pulse-powered row buffer is designed in this work. The proposed ROIC for 384 × 288 diode-based detector array is fabricated with a 0.35- μ m CMOS process. It occupies an area of 4.4 mm × 15 mm, and the power consumption is 180 mW. The measured result shows that with the proposed on-chip non-uniformity compensation, the output voltage variation is greatly reduced from 2.5 V to 60 mV. View Full-Text
Keywords: ROIC; diode-based infrared image sensor; on-chip non-uniformity compensation; differential integrato; low power ROIC; diode-based infrared image sensor; on-chip non-uniformity compensation; differential integrato; low power
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Ye, M.; Zhao, G.; Li, Y.; Zhao, Y. An Analog-Front ROIC with On-Chip Non-Uniformity Compensation for Diode-Based Infrared Image Sensors. Sensors 2019, 19, 298.

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