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Proceedings Paper

Design of 90x8 ROIC with pixel level digital TDI implementation for scanning type LWIR FPAs
Author(s): Omer Ceylan; Huseyin Kayahan; Melik Yazici; Yasar Gurbuz
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Paper Abstract

Design of a 90×8 CMOS readout integrated circuit (ROIC) based on pixel level digital time delay integration (TDI) for scanning type LWIR focal plane arrays (FPAs) is presented. TDI is implemented on 8 pixels which improves the SNR of the system with a factor of √8. Oversampling rate of 3 improves the spatial resolution of the system. TDI operation is realized with a novel under-pixel analog-to-digital converter, which improves the noise performance of ROIC with a lower quantization noise. Since analog signal is converted to digital domain in-pixel, non-uniformities and inaccuracies due to analog signal routing over large chip area is eliminated. Contributions of each pixel for proper TDI operation are added in summation counters, no op-amps are used for summation, hence power consumption of ROIC is lower than its analog counterparts. Due to lack of multiple capacitors or summation amplifiers, ROIC occupies smaller chip area compared to its analog counterparts. ROIC is also superior to its digital counterparts due to novel digital TDI implementation in terms of power consumption, noise and chip area. ROIC supports bi-directional scan, multiple gain settings, bypass operation, automatic gain adjustment, pixel select/deselect, and is programmable through serial or parallel interface. Input referred noise of ROIC is less than 750 rms electrons, while power consumption is less than 20mW. ROIC is designed to perform both in room and cryogenic temperatures.

Paper Details

Date Published: 18 June 2013
PDF: 7 pages
Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 870432 (18 June 2013); doi: 10.1117/12.2018554
Show Author Affiliations
Omer Ceylan, Sabanci Univ. (Turkey)
Huseyin Kayahan, Sabanci Univ. (Turkey)
Melik Yazici, Sabanci Univ. (Turkey)
Yasar Gurbuz, Sabanci Univ. (Turkey)

Published in SPIE Proceedings Vol. 8704:
Infrared Technology and Applications XXXIX
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton; Patrick Robert, Editor(s)

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