红外与毫米波学报2022，Vol.41Issue(4)：785-791,7.DOI:10.11972/j.issn.1001-9014.2022.04.019
基于15位像素级模数转换器的640×512规格中波红外成像用48 mW数字读出电路
A 48 mW DROIC with 15-bit pixel-level ADC for 640×512 mid-wave infrared imagers
摘要
Abstract
A low-power digital readout integrated circuit(DROIC)with 15-bit pixel-level single-slope analog-to-digital converter(ADC)for mid-wave infrared imagers is proposed. A novel pulse comparator featured power-self-adaption is presented for the pixel-level ADC to reduce power consumption. Only when the ramp signal ap?proaches the integration voltage,there is current flowing through the comparator. Furthermore,the pulse output of the comparator also reduces dynamic power consumed by the 15-bit pixel conversion result memories. For achieving the requirement of 15 μm pixel pitch,the memories adopt a 3-transistor dynamic structure and only oc?cupy about 54 μm2. The current mode transmission is used to read out the analog-to-digital conversion results to column for robustness against voltage crosstalk between adjacent column bus lines. The 640×512 DROIC with this structure is fabricated in 0. 18 μm CMOS process. The experimental results demonstrate the DROIC con?sumes 48 mW at 120 fps. The total integration capacitor is about 740 fF and the charge handling capacity is 8. 8 Me-. The equivalent noise voltage on the integration capacitor is 116 μV and the peak signal-to-noise ratio is 84 dB at the full well.关键词
红外焦平面阵列/数字读出电路/像素级单斜率模数转换器/功耗自适应比较器Key words
IRFPA/DROIC/pixel-level single-slope ADC/power-self-adaptive pulse comparator分类
信息技术与安全科学引用本文复制引用
于善哲,张雅聪,牛育泽,周晔,卓毅,马丁,鲁文高,陈中建,李向阳..基于15位像素级模数转换器的640×512规格中波红外成像用48 mW数字读出电路[J].红外与毫米波学报,2022,41(4):785-791,7.基金项目
Supported by the National Key Research and Development Program of China(2021YFA0715503),and the Open Foundation of Key Lab?oratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical Physics,Chinese Academy of Sciences. （2021YFA0715503）
