Open AccessTwo‐stage ADC‐based ROICs for 25 μm‐pitch cryogenic infrared focal plane array
Author(s) -
Niu Yuze,
Huang Zhaofeng,
Lu Wengao,
Lu Huaixi,
Chen Guangyi,
Zhang Yacong,
Chen Zhongjian
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2018.5643
Subject(s) - focal plane arrays , cardinal point , infrared , stage (stratigraphy) , cryogenic temperature , materials science , optics , optoelectronics , physics , composite material , paleontology , biology
A low‐power, high‐linearity, high‐charge handling capability two‐stage ADC‐based 384 × 288 size digital readout integrated circuits (ROIC) for infrared focal plane arrays are presented. A novel high‐speed, low‐power‐consumption comparator structure is proposed in this work. Moreover, the two‐stage ADC combines the pulse frequency modulation (PFM)‐based pixel‐level ADC and fine quantify module, improving the charge handling capability and the linearity of the readout circuit. The ROIC with 25 μm pixel pitch has been realised in 0.18 μm 1P6M CMOS process. The power consumption of the two‐stage ADC is 50 μW. The charge handling capability of the pixel is 2.3 Ge − and the non‐linearity of the proposed circuit is 0.09%.